2000 Mustang Rough Idle No Codes

2000 Mustang Rough Idle No Codes

The car was well maintained by previous one owner using only Subaru dealers. This happened twice, but once I got moving it smoothed out. anybody know what causes the 3. I have a 2002 Ford Taurus OHV 6. This didnt happen that much so i didnt think too much of it, but now it idles rough every time i stop at a light and sometimes completely stalls on me. My 2006 LR3 just started having a rough idle and poor performance + check engine light. Boat engines have the same operating principles as do land vehicle engines, but having trouble with your boat engine can leave you and your family in a precarious predicament. Genuine Ford Part. 2000 Mustang V6 stuttering low idle in gear. I took it to my friends shop and they hooked up the scanner to it; no codes, no cel, no nothing. I recently replaced the turbo because the last one went to hell. First time "no problem found. No smoke coming from exhaust and No check engine light. My 2000 zx3 does the same thing. Rough idle indicates either a maintenance problem or a failed part. I haven't gotten it anywhere yet to check the codes as it just started again this morning. The 600cfm carb is more than enough for a 302. Have changed. If you're looking to boost the power output on your Mustang, one of the first mods usually is a Cold Air Intake. He said that he re-flashed- the idle air control unit and I should go through certain motions to have my car re-learn its idle but so far nothing has worked. 2000 Mustang V6 3. Plenum is attatched to manifold and mounts up to the crossover housing. Nissan Altima 2000 Service. There was no code/CEL. Fixed it by disconnecting battery, cleaning MAF sensor, and checking sparkplugs. Since that time, the engine is running weirdly at cold start: for the first 20 seconds or so the idle drop to around 600rpm and then goes up instantly to like 1200rpm and drops againafter like 20secs the engine finally finds it's correct idle and the car runs normally. Honda Civic: Why is My Car Shaking at Idle? If your trusty Honda Civic is shaking violently, accelerating poorly, or declining in fuel economy, diagnose and repair the problem as soon as you can. EDIT: today the car was still idling rough, it was jumping around between 1k and 500 RPMs when in drive, so I went ahead and cleaned the IAC like you said with throttle body cleaner, so far its pretty much gone, but it still there ever so small it's almost gone completely. It would start and idle rough for several seconds untile the o-rings expanded just enogh to stop the air leak, after that the truck ran perfect. The intake manifold O-ring gaskets commonly leak, which creates a large vacuum leak. It has almost 80k miles on it. I have a 2002 Ford Taurus OHV 6. Ford Ranger Forum - Forums for Ford Ranger enthusiasts! > Engine Tech Forum > 6-Cylinder Tech > 3. 9v at closed throttle did u check. A few days ago, the car would idle very roughly on startup, but not stall. After work, it still ran fine. My 2000 zx3 does the same thing. The head gasket was replaced at 90K along with the timing belt at 100K. And when it comes to older cars and. Causes Causes of the OBD-II code P0430 A code P0430 may mean that one or more of the following has happened: The catalytic converter is no longer functioning properly An oxygen sensor is not reading (functioning) properly. Everything was traced back to the CCV. Or 43 Three digit code 172 or 176 - O2 sensor indicates system lean. Codes P0171 & P0174 + rough idle At some point during the month of August the Roadfly forums are going to become archive only. What is the idle set at? It seems like the idle was high before the PCM learned the trims then dropped down and you noticed it running rough. after about 10 minutes the idle would return to normal and the car would be fine. My car was having a rough idle when stopped at stop lights where the rpm would dip and you could feel the car rumble a bit. Just had this on th 06 v6 I just bought. net, the internet's premier Ford truck community!. Ran great for a week and the same problem occurred, once the check engine light started flashing I knew it was a misfire. Last time it came on I had it scanned and it said O2 sensor running lean. 4 V6 with approx 140000. no spark or voltage to the coil until about 2100 rpm when it kicks back in. 2000 Ford Mustang 3. 0 dies and idle surge) computer of the Mustang can be. Took it to the garage they checked the sensor and said it was fine and cleared the code. Today, it ran fine going to work, then fine again coming home for lunch and returning to work. As its idleing however, the rpms fluctuate up and down erratically and then it'll smooth out for a few min and then it will begin again. info with full instructions and illustrations on how to repair this problem. Ill take a shot at it. I have no idea if the car will start or get me home today. Since they no longer use a fuel reuturn which stirrs the gas up really well in the tank, it could come though in a lump, especially when left sitting and the water settled to the bottom of the tank. When I leave, if I leave, I plan on going straight to the auto parts store to get the codes read. How to fix rough idle mustang 4. Thanks to the guy who I bought the truck from for installing the remote start. on my way into my 48 hour shift at work, truck is idling really rough, almost to the point of stalling. At first before I had the code reader I thought it was the fuel filter so I changed that but still had the problem and the check engine light. I grabbed the current codes, IRC V1016 PCM P0410. I read on another forum that is was a big problem on 97's. Nobody looks forward to seeing that annoying orange check engine light on their gauge cluster light up like a street light. So it should be okay. 8 because one of the valves got bent it set not running for about 5 years when i got it back together it 2000 mustang rough idle p0174 code - EricTheCarGuy - EricTheCarGuy- Stay Dirty!. Rough Idle, hesitation on acceleration, loss of power When I start the engine its starts up right away with no issues. Anyway the van runs great except when i come to a light in drive and stop kinda feels like a slight miss or rough idle just very minor but I like the motor to run smooth so if anyone could help would be greatly appreciated thx. Q: When I use my car it idles at 700 and then stalls when used for 5 min but there are no check engine lights. I had the dealer check it before i bought it and was told no codes came up. It has almost 80k miles on it. After the above repairs were complete the car was started and there is a loud squeak, knock, then a rough Idle. Thought it was a coil pack, EGR valve. 2000 Ford Mustang 3. Damage to the car's carburetor and vacuum hoses can cause the engine to misfire, resulting in a rough idle. Engine is fine, but when it needs a rebuild in the future, I will go for K-code specs. When I turned it off the fans continued to run for several minutes - longer than they've done before but it was a very hot day and I'd climbed about 3000 ft on the day's driving (and was using air. Plenum is attatched to manifold and mounts up to the crossover housing. As its idleing however, the rpms fluctuate up and down erratically and then it'll smooth out for a few min and then it will begin again. Rough Idle on cold start up (about 50% of the time), within minutes, it runs great. I have been chasing a rough idle on a 2002 Seville SLS. No other codes. After replacing spark plugs ,checking coil packs ,throttle body,map sensor,cam sensor and fuel injectors,no issues found there. We have a complete list of Mustang DTC check engine codes located in one place! No more scouring the internet to find what that “service engine soon” code means. I just replaced the plugs about 3 months back and it ran fine after, people have told me things like it is the o2 sensors to the cat is plugged up to my fuel filter is bad. Some older cars use a carburetor to process fuel, rather than a fuel injection system. Rough idle and misfiring, but no codes. 2001 Mustang Code P0352 Running Rough And Timing Is 24. This company is not yet accredited. Changed the plugs,tested the coils for spark,tested the egr system,looked for vacume leeks,cheaked the pvc,cleaned the throttle body. Plenum is attatched to manifold and mounts up to the crossover housing. 6L missing and rough idle HELP!! I have had no problems with the truck until about 6 months prior to doing the tune-up. It will go from normal to a low idlenot a rough idle and it doesn't act like it's going to shut off but a definite low idleprob around 350-400 RPM. The same thing happens while drivingit'll stall when coming to a stop. Categories: American Classic Cars | Muscle & Pony Cars. the code may be accompanied by misfire under acceleration, rough idle, or engine dying altogether. Just off idle they stop miss firing when viewing misfire data on scanner. i have a 07 f150 4. I have a 2000 Honda Odyssey with engine codes p1399 and p0401 which one is EGR and the other is misfire. Q: When I use my car it idles at 700 and then stalls when used for 5 min but there are no check engine lights. There was no code/CEL. Exterior; Fog lamps; Vinyl upper/anti-scuff lower door trim w/integral armrest, map pocket, door pull handle, courtesy lights; Instrumentation; Auxiliary pwr point in instrument p. The intake manifold O-ring gaskets commonly leak, which creates a large vacuum leak. Thanks to the guy who I bought the truck from for installing the remote start. Problem hadn't reappeared for me yet, but it has only been a day or two so far. I have a nissan 240sx also. motor was bad when i got it, swapped in another engine. I have a 1995 Chevy Blazer purchased in 2006. It's a '66 coupe C-code currently built to A-code specs. Not sure on the x5 but this is what I worked out. I am at work, my car was running poorly (rough idle, louder engine, exhaust gas/smell), and the check engine light is on. Idle problem remains a odd frustrating headache after much work. I took it to my local Audi garage and after some false diagnosis one of the “master Technicians” noticed a faulyt “breather system separater valve”. What causes your 5. For the past 3 days my car has been running like ****. I think its on the lower end of the top part of my intake, but I'm unsure. I'm having a similar problem, codes 22 tps sensor signal voltage low 33 map sensor signal out of range, high Are coming up but I've already changed out the map sensor and the tps seems to be working I disconnected it and idle went up to around 2 or 3 rpm and when I hooked it back up it went back down to a rough idle like its been doing. I took it to the dealership and they said it was a fuel injector going bad. How to fix rough idle mustang 4. The one problem I am still having is that the idle still sometimes drops when I am sitting still. Rough Idle,no power, Codes OIl leaks. Acceleration is sluggish, pushing on the pedal gives no immediate response. 2001 Mustang Code P0352 Running Rough And Timing Is 24. At first before I had the code reader I thought it was the fuel filter so I changed that but still had the problem and the check engine light. Average repair cost is $100 at 92,800 miles. Most times, code numbers can pinpoint the exact system failure or miss in the engine. Portal » Board index » Mechanical and Maintenance (no chat or performance) » 2000-2005 (other than GXP) All times are UTC - 5 hours [ DST ] 2000 sle, rough idle - random misfire code. Not only that, but quite a few things can cause a misfire condition (or misfire trouble codes). I'm really stumped on this one because there are no DTC codes and it goes away when it warms up. It's a '66 coupe C-code currently built to A-code specs. Still did not fix problem, now if you unplug most of the sensors no check engine light comes on or change to the engine. Q: When I use my car it idles at 700 and then stalls when used for 5 min but there are no check engine lights. Engine Stalls, Misfire Code, & Cylinder Misfire The engine may be stalling because it isn’t getting enough throttle opening. I drove about 700 miles to work, didn't notice anything out of the norm. I have a really rough/missfiring idle, it seems to go away over 1500 RPM, but the car idles terribly at startup and gets no better when it is up to temp, it is bad enough to cause it to occasionally stall. Sometimes called an "executive car", the S80 was and continues to be Volvo's top-of-the-line passenger car. I have been to the dealer 5 or 6 times now. So the past couple months I've noticed my truck has a really rough idle in the mornings when it is cold out, to the point where it has even died before. As is says, this controls the engine idle. Have changed. 2000 Ford Ranger Rough Idle/turns Off When Ac Is On. My 1994 Town & Country (3. Just after start up it idles higher than it should and runs rougher than it should The plugs on the back 2 cylinders (5 &6) I believe appear oil or fuel fouled and had what I thought was coolant I did a compression test and all cyls were nearly equal. Made to the original factory specifications from OEM quality materials, this Mustang Idle Air Control Valve with Motor is a direct fit OEM Ford replacement part that provides reliable maintenance-free operation. This company is not yet accredited. OBIO3 Dodge Dakota JOIN HERE 1/12/2007 19:00:10: RE: Very rough idle when stopped IP. At first it would just idle rough for a few seconds and then return to normal. Tried shutting down and restarting, same thing. Former name for GM (only) Data Link Connector, the connector socket into which the scan tool plug is inserted; sometimes used to refer to any pre-OBDII computer signals. Hi, I am new here and to the caravan just bought an 02 caravan se 3. Use the command in the scan tool to increase the engine’s idle. Sometimes the Idle Air Control (IAC) may have carbon built up. Another plug OBDII Shorthand List. 8 144,000 miles. Idle problem remains a odd frustrating headache after much work. Codes P0171 & P0174 + rough idle At some point during the month of August the Roadfly forums are going to become archive only. Code 91 is the driver side sensor, as viewed from the driver's seat. 2015 Silverado code P050D I keep getting a P050D code cold start/rough idle. Note: An additive can sometimes, however, cause a rough idle problem. It doesn't do it all the time but most of the time it does and when your driving down the road it runs perfect. Engine is running fine. Use the command in the scan tool to increase the engine’s idle. i have check the systems and cant find anything wrong. But you can definitely feel a change in the smoothness of the idle. I have an Altima 98 with 68K miles on it, I was on the highway and everything was running smooth, then out of nothing the SES pop out and lots of smoke came out from the muffler whit an intense smell of unburned gasoline, extremely rough idle and great loss of power and obscence bad millage and the car won't go any faster than 40 miles per hour; I managed to reach the city. Revised 20-July-2017 to add note that the 94-95 uses a 4 wire O2 sensor. Anyway the van runs great except when i come to a light in drive and stop kinda feels like a slight miss or rough idle just very minor but I like the motor to run smooth so if anyone could help would be greatly appreciated thx. 14 Ignition pickup (PIP) was erratic - Ignition Systems E4OD Transmission diesel RPM sensor - Diesel RPM sensor. I want to prepare the C4 for this future scenario since it's in need. Rough idle indicates either a maintenance problem or a failed part. I obtained a reading of 1. 8L v6, runs rough especially when warm, doesn't want to idle, low power have to keep rpm's - Ford 2000 Mustang question Search Fixya Press enter to search. My question now is, is it safe to drive the car? I heard that if its AOS, it can be dangerous. Misfire/Rough Idle. info with full instructions and illustrations on how to repair this problem. We changed harmonic balancer but severe vibration still exists with car in park, neutral, reverse and drive. Just adding additional clarification if it helps you come up with an idea that is plausible. Changed the plugs,cap,rotor, wires, air cleaner ,pcv valve, cleaned iac valve and still no change. Good luck. Jumped it so I was aware of the rough idle when I bought it. I recently replaced the turbo because the last one went to hell. Light actually went off after long warm up, however came back on after about 6 miles Any ideals? HELP. It's a very common problem for the Ford Windstar. Hello, I soon have to rebuild my stock C4 transmission (early type, 24 spline). Have replaced air filter, fuel filter, spark plugs, spark plug wires. 2000 F-150 Engine Running Rough (idle, best, battery, sensor) User Name: See if you still have any codes. Low or Rough Idle with Electronic Throttle Control (Clean Throttle Body) - (Jun 14, For 2000-2002 model year. Finding the problem can be daunting, especially with so many sensors and switching valves involved. Hence, after knowing the ways to troubleshoot rough idle when warm problem, anyone. 8L Essex V6 that now came from the factory with an Intake Manifold Runner Control system that slightly boosted the base model's horsepower rating to 193hp with 225ft/lbs of torque. We cleaned everything out, replaced the water pump and gasket (water pump was fine but did it since we were in there), and replace the timing belt. Engine is fine, but when it needs a rebuild in the future, I will go for K-code specs. I think its on the lower end of the top part of my intake, but I'm unsure. 8 liter V6) fell flat on acceleration. At which point you realize, this is due to the fact the catalytic converters are no longer on the car and get a proper tune to support this modification. Runs rough at the coast / power point. Thanks for getting back to me. The Ford Mustang is an iconic American sports car that first debuted in 1964. Good luck. 8 because one of the valves got bent it set not running for about 5 years when i got it back together it 2000 mustang rough idle p0174 code - EricTheCarGuy - EricTheCarGuy- Stay Dirty!. We have 36 cars for sale listed as rough mustang, from just $2,000. Hey Dub enthusiasts, I'm working on a 06' Passat 2. RE: Very rough idle when stopped IP: Logged Message: "Detori, I'm on my third dakota, the rough idle just comes with age. Rough Idle,no power, Codes OIl leaks. Top 10 Causes of a Rough Idle | JL Motorworks. Fuel Trim code(s). 7L to idle rough? here are some possible reasons i found while searching lost: 1) 90 degree v-6's idle rough 2) motors were manufactured slightly out of balance 3) the 3. Next I'll test the secondary air pump. Dealer replaced Idle air control valve to the tune of $200. to die when I go from about 2000-3000rpm, and depress the clutch, as if diagnostic codes (was Re: 5. I read on another forum that is was a big problem on 97's. The idle air control motor (IAC) controls changes in idle caused by engine load. We have 36 cars for sale listed as rough mustang, from just $2,000. Misfire/Rough Idle. At first before I had the code reader I thought it was the fuel filter so I changed that but still had the problem and the check engine light. But when I am stopped at a light it feels like my car is going to die. have the OEM manuals volume 1 & 2. P0505 FORD Meaning This system automatically controls engine idle speed to a specified level. At first it would just idle rough for a few seconds and then return to normal. Local shop checked out the wires, plugs, and module units at each cylinder. Though we all love our mustangs, from time to time they needs repairs that we might not know about. 8 No codes are being thrown, However on my reader it shows FuelSys1 - OL. My son has a 2000 Mustang 3. Read more Ford reviews to learn about other models. I have done an oil change, checked motor mounts and trans mount (they seem to be ok). 2000 Ford Mustang 3. Idle problem remains a odd frustrating headache after much work. The fuel injected Mustang uses a small motor/valve assembly that allows a specific amount of air to enter the engine to control it's idle. Sputter, rough idle, and fuel odor Since then, it has become worse, and now there is the additional symptom of a STRONG fuel odor. Q: When I use my car it idles at 700 and then stalls when used for 5 min but there are no check engine lights. 2003 discovery, 85000 miles. Gonna have to try a mate's MAF to confirm and then see if it can be fixed with a simple clean or need. A tremendous lack of power upon acceleration. Had check engine light when I bought it. Granted, I've got 95k miles, but I have a GMPP Majorguard warranty until 105k miles. Re: 2001 Cadillac Deville Stalls/rough idle Hey guys I know is been a while, I got the plenum replaced and it started stalling alot so I replaced two of the crank shaft sensors that went bad, that was a few days ago and now the check engine light is back, but there is no problem that I can feel. 2000 Mustang V6 3. 3L equipped Ford Mustang or Ranger (Mazda 2300) can seem quite daunting since you have 8 spark plugs and two coil packs to deal with. there is a significant hesitation at takeoff, and what felt like multiple misfires, and a noticeable loss of power while driving. Connect a bidirectional scan tool to the same OBD port you would plug a code scanner into. I finally replaced the adjuster for one of the timing chains because there was too much slack in one of the chains causing the erratic idle. Rough idle indicates either a maintenance problem or a failed part. They said Id need to hook up the computer to narrow down which cylinder(s) are misfiring. I purchased a 2000 Subaru Legacy Sedan with automatic transmission and 121K for my daughter. MAF looks like it may be a little low on performance but should be ok. Have tried 3 different obd 2 scanners. i own a 2001 v8 tundra with 67k miles. I haven't gotten it anywhere yet to check the codes as it just started again this morning. 17-18 in town / 21 highway. 0l 2-valve engines may exhibit a cranks no-start, rough idle, malfunction indicator lamp and/or any driveability symptom associated with a rich or lean fuel mixture. 26 volts at idle with no noticeable change in voltage while revving. A few weeks ago my daughter said the car would run rough at idle and occasionally stall when she started up. I have a 64. Changed the plugs,tested the coils for spark,tested the egr system,looked for vacume leeks,cheaked the pvc,cleaned the throttle body. any other advice??. 8 No codes are being thrown, However on my reader it shows FuelSys1 - OL. Hi everyone, am having problem with my 4unner and was wondering if anyone can help. to die when I go from about 2000-3000rpm, and depress the clutch, as if diagnostic codes (was Re: 5. 3L equipped Ford Mustang or Ranger (Mazda 2300) can seem quite daunting since you have 8 spark plugs and two coil packs to deal with. It only takes a minor problem like a fouled spark plug to cause your engine to vibrate. a little rough at idle Sign in no codes shown up on dash (don't have SCT yet so I can't scan it). A misfire will not always set a code. My last option is he crank sensor before I bring it in to someone qualified. But after a little while it would idle rough and stall again. 2 v6 automatic has no power in drive or reverse runs smooth as silk in park and neutral but put in drive will barely go if you hold break down you can push gas pedal all the way down and wants to choke down if you put in drive and just let it go it lopes and chugs no check engine light no codes but want run in gear any ideas i cleaned maf no change. But you can definitely feel a change in the smoothness of the idle. MAF looks like it may be a little low on performance but should be ok. What causes your 5. When the engine is started cold, regardless of the outside temperature, the idle is rough and there is a noticable power loss. I have even seen PCM updates fix a rough idling condition as well. Well, after changing fuel and air filters, IAC valve change, cleaning MAF and Temp sensors, and changing all vacuum lines, come to find out the PCV valve hos. Most times, code numbers can pinpoint the exact system failure or miss in the engine. If its running rough/ missing, and everything else is fine i think that indicates a vacuum leak. Rough Idle, No power, black smoke??? Started truck up from inside the house this AM 21 degrees outside. However, the most likely causes come from the basic operating components that control fuel and ignition. Genuine OEM Control Arms & Parts for Ford Mustang, Genuine OEM Cruise Control Units for Ford Mustang, Genuine OEM A/C & Heater Controls for Ford Mustang, Valves & Parts for Ford Mustang, Air Bypass Valves for Ford Mustang, Valve Stems & Caps for Ford Mustang, Seats for 1996 Ford Mustang, Seats for 1997 Ford Mustang. And it won't start for at least 6-8 hours. Yesterday my wife started up the truck to come home and it started rough and has no power. My 2000 zx3 does the same thing. 1994 mustang idle a little rough, no power, slight missfire sound. Dealer replaced Idle air control valve to the tune of $200. Intermittently, it will begin to stumble/shutter at low RPMS/Idle. But it didn't solve the problem. Turns out it was a vacuum leak at the intake manifold plenum. I am getting the 2 sets of 3 beeps when I start, which I believe indicates service is due. It still has a rough idle but sometimes is smooth and other times is rough and then sometimes its really lopey. The idea is to free up air-flow coming into the engine which allows your Mustang to breathe easier equating to more power. While driving my 2011 Ford Mustang down the road the check engine light and the wrench light came on and lost all power, the engine never died but would only idle very rough. So that doesn't concern the gas. 2000 Pontiac Gr Prix Rough Idle/Dies while driving 4/15/10 Took car to dealer for code scan and an auto repair shop for code scan. Many people have had problems with their Dodge Ram 1500 running rough. 2000 Ford Mustang 3. Rough Idle,no power, Codes OIl leaks. There is a lack of power and sputtering with a miss when driven, most of the time. Input please when u have bigger injectors u dont want to lower the fuel pressurewith the 24's u should be around 44 psidid it just start to do this or did u change something and then it changed is the maf calibrated for the 24's? the tps voltage should be around. No improvmement. kinda misses at idle. Code 91 is the driver side sensor, as viewed from the driver's seat. We have 36 cars for sale listed as rough mustang, from just $2,000. It has almost 80k miles on it. If there are no intake leaks, the next step is to replace the air filter and clean the air flow meter. Many times, that will not register a diagnostic. There was no code/CEL. Code 91 is the driver side sensor, as viewed from the driver's seat. Rough idle indicates either a maintenance problem or a failed part. I just got a used 04 and noticed the same thing. I initially had problems with my EGR valve. No improvmement. 8 that is missing very badly and stalling at idle. It's been even hotter--105 a couple times--and I didn't have this issue. 6 engine codeY. At idle, engine will suddenly slow from 750rpm's to 680-700 and "lope" a bit and is rough. my car is a 2000. Just after start up it idles higher than it should and runs rougher than it should The plugs on the back 2 cylinders (5 &6) I believe appear oil or fuel fouled and had what I thought was coolant I did a compression test and all cyls were nearly equal. No engine codes present. also the a/c compressor won't kick on but fan #1 I know works fine. it has to do with the timing. Comp Cams 05-09 GT MuthaThumpr Cams- Very Rough Idle, Largest Cam that will work with Stock heads- BIG CAM , Helvetica" size="2">MUTHA' THUMPR - Very rough idle, biggest cam for stock heads. I have a 2003 Ford e-150 cargo van, 4. I just bought a 2000 Subaru Legacy and finding the same problems with this car. still has rough idle. Last time it came on I had it scanned and it said O2 sensor running lean. I am getting the 2 sets of 3 beeps when I start, which I believe indicates service is due. Mustang Idle Air Control Motors (IAC) LMR offers OE Ford replacement as well as after market idle air control motors to save you some time and money on your repair job. It's been even hotter--105 a couple times--and I didn't have this issue. I get a PO300 random miss fire code, miss fire is at idle only on 3&4 cylinders, bought it this way last week. The 600cfm carb is more than enough for a 302. Many people have had problems with their Dodge Ram 1500 running rough. My 2000 zx3 does the same thing. the engine has a rough idle. Ok, the basics: 2000 Ford Expedition 5. I think that is what I am going through right now, my idle is 650 and I think I'm going to raise it to 700 to start then go from there. How to fix rough idle mustang 4. And when it comes to older cars and. hey, we have a 2000 Mercury Sable that has recently started giving us some problems. No codes are being thrown. I had idle misfire on my '03 DOHC for at least 6 months and no codes, no pending. I have been chasing a rough idle on a 2002 Seville SLS. Not only that, but quite a few things can cause a misfire condition (or misfire trouble codes). 0 Vulcan Tech Lots Of Problems Solved. No power/ idle's rough, runs terrible, HELP I pulled the code on it and replaced one of the O2 sensors, the one below the first convertor on the passengers side. The idea is to free up air-flow coming into the engine which allows your Mustang to breathe easier equating to more power. It would start and idle rough for several seconds untile the o-rings expanded just enogh to stop the air leak, after that the truck ran perfect. The idle air control motor (IAC) controls changes in idle caused by engine load. Car is at 120K now. There is NO SES light and NO codes. Cleaned MAF sensor, throttle body and air intake sensor, new IAC valve, new air and fuel filters, new PCV valve. hold your idle at 2,000 for 20 seconds or so and then again. So that doesn't concern the gas. That costs nothing. Acceleration was poor too. Took it to the garage they checked the sensor and said it was fine and cleared the code. But when I am stopped at a light it feels like my car is going to die.