no codes bad acceleration - Ford Mustang Forum
 
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post #1 of 3 (permalink) Old 12-28-2010 Thread Starter
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no codes bad acceleration

Havent been able to figure this out at all hoping someone on here can help.
2002 mustang 3.8 manual.
It starts first time every time and idles just fine.
The only code its thrown was egr related I changed the pressure sensor and that was fixed. When I rev it from idle it stumbles bad.
If I give it light throttle then rev it up it seems fine.
Drive is horrible I cant give it more than about 1/2 throttle and I have to slowly work up to that. I can still drive it but I cant accelerate without a lot of hesitation. Changed plugs and wires all filters cleaned maf. with no codes to go off of im not sure what else to do. I thought possible coil issue but I tested it with an ohm meter and all the ports are showing in spec. any ideas

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post #2 of 3 (permalink) Old 12-28-2010
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Sound like you may have left a vacum open when you did the EGR replacement. If there is any leak behind the naf you will have very weak accelleration.

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post #3 of 3 (permalink) Old 12-28-2010 Thread Starter
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This all happened over a year ago. Its my sisters car so not sure what exactly happend but she said she was driving it and it was fine then when she started it one day this happened. Thats when I changed all the plugs and did everything else. which seemed to help a bit but still drives like crap. Vacuum also usually effects idle this thing has no problems with idle and vacuum readings are all good as well. only seems to have problems under load.
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