when I first take off in the morning acceleration is fine for about 5 minutes.After that it lurches when I step on the gas.At a steady speed it is fine.It will do this for about 15-20 miles then it stops lurching.It's still hard to accelerate and the gas pedal seems stiff(maybe that's just me).the engine has to work harder though to keep a steady speed .Rpm's are steady when it is lurching.
2007-06-08 14:13:12 · 2 answers · asked by james h 2 in Cars & Transportation ➔ Maintenance & Repairs
A lot of those GM cars have issues with either the throttle position sensor or the mass airflow sensor.
Just for giggles, put some fuel injector cleaner into your next 2 or 3 tankfuls of gas.
If those check out I'd suspect transmission control circuits. Check the trans fluid...if its black change in ASAP.
2007-06-08 14:27:08 · answer #1 · answered by Anonymous · 0⤊ 0⤋
While the engine is cold, the computer does not control the emissions/fuel and is preprogramed.
As soon as the engine warms up, the computer goes into what's called "closed loop".
That means the computer is controling the air/fuel mixture, timing, and EGR.
Apearantly, there is a sensor that is not operating properly, and it's nearly impossible to troubleshoot without a diagnostic computer.
Some engine problems may not show in the ODB-2 trouble code scanners.
I recommend have an engine diagnostic done at a REPUTABLE family owned shop that specializes in your make of car. (GM)
Don't start replacing a bunch of parts trying to find the faulty part. It's a tremendous waste of money.
Pep-Boys, Sears, and all those big chain stores hire idiots that can't get a real jobs.
2007-06-08 14:24:45 · answer #2 · answered by Mr. KnowItAll 7 · 0⤊ 0⤋