what r the symptoms of a bad pcm? - Ford Mustang Forum
 
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post #1 of 9 (permalink) Old 06-20-2012 Thread Starter
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Angry what r the symptoms of a bad pcm?

Hey guys I have a 96 mustang 3.8l that im trying to fix right now.i have both running lean codes but i replaced alot of stuff and fixed all the vacume leaks. this is all the stuff i replaced. Egr,dpfe,o2s,maf,uper and lower intake manifold gasket,fuel filter spark plugs, spark plug wires, and the ignition coil. I pretty much replaced everything that would cause the codes the car runs great no problems jus the codes wont stay away. Thats why I was suspecting that the pcm is at fualt that and it never runs the egr monitor. So if you can help me out it would be much apreciated. Sorry if there is already one of these questions posted already.
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post #2 of 9 (permalink) Old 06-21-2012
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First of all welcome to AFM! Have you tried reseting the pcm by unhooking the battery for like 5 seconds. Try that then drive it for like a mile then if the light pops recheck it. Have you looked at you"re o2 sensors? That's why my lights on now, and its not having any performance issues.
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post #3 of 9 (permalink) Old 06-21-2012
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Some PCM codes such as: 511

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post #4 of 9 (permalink) Old 06-21-2012 Thread Starter
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thank you. I have taken the battery cable off to reset but everytime i go and drive it, the mil usaully comes back on with the same codes.The o2s are brand new i think i bought them two months ago.I took it to a mechanic and he is baffled about the car.so thats y i was thinking that the pcm needs to be updated.
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post #5 of 9 (permalink) Old 06-21-2012 Thread Starter
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Quote:
Originally Posted by robb15033 View Post
Some PCM codes such as: 511
I dont have that one popping up.Someone told me that it could be the pcm telling my car that it has a lean condition when it doesnt.
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post #6 of 9 (permalink) Old 06-21-2012
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If the mechanic is baffled, time to replace him. If he replaced all those parts hoping it would fix it, time to ask for a refund. THere is no guesswork if you follow proper troubleshooting techniques. Get AllData.com for $25 and if you can read a flow chart then you should be able to narrow it down.

Dartboard mechanics are the worst, never give them money.
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post #7 of 9 (permalink) Old 06-21-2012
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+1 on above.

Do you want to fix this yourself? If so, always post the full DTC codes. There are 1000's and they each have a story to tell.

In general, a lean DTC is usually a vacuum leak, exhaust leak, dirty MAF, or clogged fuel injector.

If you are POSITIVE there aren't any vacuum leaks/exhaust leaks, then consider an injector cleaning/flow test service such as injectorRX.com. Once cleaned and tested they are as good as new. Cheaper than new.

I can also help you get a full copy of the Ford service manual. PM if interested.

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post #8 of 9 (permalink) Old 05-27-2015
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Please help.

I am getting codes p0010 p0020 p2004 p2005 p0171 p0443 could this mean the ecu is faulty. I have a 2005 mustang gt with Granetelli CAI, Bassini Axelbacks. The car runs but not running the way it should, running the on the 93 race tune. Sounds like it is sucking air when I rev it up and it self revs until it warms up.
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post #9 of 9 (permalink) Old 05-27-2015
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Quote:
Originally Posted by pat2005 View Post
I am getting codes p0010 p0020 p2004 p2005 p0171 p0443 could this mean the ecu is faulty. I have a 2005 mustang gt with Granetelli CAI, Bassini Axelbacks. The car runs but not running the way it should, running the on the 93 race tune. Sounds like it is sucking air when I rev it up and it self revs until it warms up.
Would you like a "low tech" method to determine if your PCM is faulty? Consider restoring the PCM to factory tune. IF the problems go away, then you will know that the PCM is good.

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2000 GT coupe (Craigslist project. Fixed. Now my DD). Windsor to Romeo swap.
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