2002 grand prix-no acceleration,won't go above 3500 rpm

kevwoj

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Apr 26, 2007
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any help would be appreciated--2002 grand prix- 3.8L
problem- won't accelerete properly, shifting is late and at higher rpm-have to feather gas petal, slowly press down and let up to get up any speed. suspected fuel problem-checked fuel for water (clean) changed fuel filter, checked for vacuum leaks, couldn't find any. in idle ,motor revs but won't go above 3500 rpm. fuel pump seems fine. problem happened sudden, one day it was fine, the next it wasn't. no error codes showing=no check engine light. nothing done to car recently. 62,000 miles.


thanks
kwojtas@adelphia.net
 

Transman

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The problem with codes/no codes is that sensors can wear out without coding. A sensor can read/ give the wrong informtion which makes it bad but not be out of the spec that the computer is looking for making IT think it is good and info it receives be accurate. That being said the steps you need ot do is read the data for your self and determine what is inaccurate. You might have a problem with the basics (most common) plugs, wires, coil(s), air filter, fuel filter, vacuum leaks, even the pcv valve can cause this. I have seen cracks in the air snorkel that allow unmetered air in that only open when the engine rpm is raised. You could also have a problem at the other end.. a clogged exhaust system/cat. The vehicle has to breath both in and out, a restriction in either end will cause this kind of problem. I have seen bad grounds cause this problem, corrosion is the enemy of conductivity. Especially at the battery. After you check the basics then you might need to read the data stream, pay someone to read the data or maybe in this case use AlldataDiy to follow a diagnostic tree to pin down the problem. Post back with more info so we can help more than generalities. Transman
 
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