94 3.8 off idle hesitation problem - Mustang Evolution

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Old 07-03-2006, 12:23 PM   #1
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94 3.8 off idle hesitation problem

I just bought this car and the 3.8 seemed gutless off idle , it has a major hesitation when you snap open the throttle ( car in park not moving )
I have tryed various thing to fix it but nothing seems to help. It has dual exaust without cats and a K&N filter, I have cleaned the MAF then replaced it with another used one . replaced plugs , swapped out coil pack , wires ,air idle motor, map sensor ,checked egr valve , Timing is dead on factory spec of 10 degrees. It feels like a timing problem . not sure if the cam or chain set has been replaced but I think I may have to tear it apart to check cam timing , it may be one tooth out , any other suggestions would be greatly appreciated
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Old 07-14-2008, 02:29 PM   #2
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Re: 94 3.8 off idle hesitation problem

I have a 95 3.8 with cold air intake, ford racing H pipe (no cats) and magnaflow mufflers and had the same problems you do.

Here are some things to look for. Also is your car shooting any check engine (ODB) codes? Alot of times if you are running a catless exhaust and dont have MIL eliminators it will shoot a check engine code but then again I've seen mustangs that dont shoot the code.


-Check for vacuum leaks your system can detects a leak as small as 1mm in size. Yes this even means check the security of your oil cap. check all hoses that attach to the intake manifold and all hoses that run downstream the MAF and upstream of the 02 sensors.

-I saw you already cleaned the MAF but that helped me alot I just took it off and sprayed some brake cleaner all over it and some on the sensor itself and repeated it about three times.

-Take your CAI off to get to the throttle body and inspect it and then manually open it and see how much black residue or how much dirt is on it and you can take some electronics cleaner and spray it down but dont scrub hard the TB's have a special coating on them that you dont want to take off but be sure to get everything cleaned evenly.

-I also had an 02 sensor go bad and that took some power away from me as well.
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Old 07-14-2008, 02:31 PM   #3
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Re: 94 3.8 off idle hesitation problem

could also be a clogged or bad fuel filter as well. You could also try running some fuel system cleaner through your car i remember i did that too and it helped.
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Old 07-14-2008, 07:19 PM   #4
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Re: 94 3.8 off idle hesitation problem

Ive had the lag issue before and every time it was just buildup around the throttle plate, try hitting the throttle inside and out with carb cleaner.
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