Question about 2003 Pontiac Grand Prix
While driving down the fwy at constant speed or under acceleration load, the tach will drop out to about 2000 then float back up to 3000 rpm. this happens without shifting into overdrive. what could the possible problems be?
Sounds like a tcc issue in the transmission. some times it can be fixed with an ecm flash. often it is a bad tcc solenoid inside the trans. valve body.
Posted on May 08, 2014
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Posted on Jan 02, 2017
SOURCE: My grand prix, shifting problem.
sounds like you need to check your throtle position sensor first. that will cause this problem.you can go to autozone they cancheck it with a scanner. hope this helps you out . Phil
Posted on Jan 17, 2009
Could be a solenoid, there are solenoids accessible thru the bottom pan that control shifting functions. Do you have a check engine light on? If so An OBD2 scanner can tell you what code was set.
Posted on Mar 12, 2009
some of the trannys has straps in them that sometimes needs to be tightened and that could be the cause of it
Posted on Mar 24, 2009
this trans is the 4T65E. It needs a 4th clutch hub. The splines strip off around 120k or more because they weren't hardened from the factory. The new ones have the hardened splines. The trans needs to come out and be partially torn down. I've fixed alot of these. Change the EPC solenoid while you are there. They wear and hang up causing intermittent harsh shifts
You can drive them forever without changing the hub but you'll never have 4th gear
Posted on Apr 02, 2009
it is possible there is a soft vacuum line. try looking behind the maf sensor [attached to the air filter box] on the right side near the plenom next to a blue connector. it's a small piece of hose that is looped from one vacuum circuit to another. I have found them to get very soft and **** air.
Posted on May 19, 2009
Testimonial: "The problem seems to be less consistent now. Guessing maybe there is still a vacuum leak somewhere else. Thanks for the tip :)"
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