My buddy has a Grand Prix turbo'd and got screwed when he took it to a shop (Don't know the initial issue). Now he has it back, but when stopped at a light, it'll rev up to around 1800 rpm's. Also gas mileage is horrible (12mpg). Any ideas?

Sorry I don't have much info...
Thanks.

 

might have a vac leak, but i would also find out what the shop did to the car or what was wrong with and let us know

 

Yep, possible vacuum leak. The shop may have left a vauum line off or hooked it to the wrong port. It's also possible his thermostat is stuck open or he had a cooler one put in. Good idea on carbureted engines, bad mojo on computerized fuel injection. It puts the induction system into "open loop" mode and never gets out of it because the engine never warms up.

 

Thanks fellas. I'll look into it and report back.

 

Odd as it sounds check your coolant level. Or tell him to check his, he got the problem !!

 

Ironically enough, I'm helping him out with a coolant flush some time this weekend.

He said he initially took it to the shop because of a grinding noise coming from the AC pump. Doesn't really seem like that would really cause it though..? He also said they broke a coolant pipe and a brake line in the month they had it. Just tryin to help a brotha out. Thanks guys.