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Car Stalls at a red light. No codes. Could it be my throttle body?

6K views 11 replies 6 participants last post by  gruvedaddy 
#1 ·
Hi everyone I have a 2008 G6 Gt with 50500 Miles and lately it's been stalling randomly at red lights.

This morning around 9:00 a.m. I was driving my sister to work and when we came to a red light my power steering stopped and my engine died. I had to put my car in neutral and then turn the key to start it back up. This has happen 3 times within the past 3 weeks. Right now my car has no codes so I can't really pin point what the problem is.

I have did the following things to my car: I replace my MAF sensor with a brand new OEM AcDelco one 6 days ago, car still stalls so it can't be related to that sensor. Car has a new fuel pump which was installed back july show it's still new. Took it to a shop for a vacuum leak check a week ago, mechanics didn't find any.

Now, I realized today that around late August or early September I did replace my throttle body because my old one looked dirty and had stains on the plate. Now I only had this car for 4 months but before September the car never stalled. Also the new Throttle body is an aftermarket. When I drive my car it accelerates fine and doesn't really feel sluggish, it just randomly stalls at red lights. Could it be the throttle body? I still have my old TB and I cleaned it today with tb cleaner and replaced the aftermarket one with it and so far it hasen't stalled. Or could it be something else?
 
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#5 ·
I put the old throttle body back on and drove around town for 40 mintutes. Car hasn't stalled yet which is a relief. I also noticed the car idles a little smoother at stops now. I'm probably gonna drive around with the old tb for about a week and see if it stalls the car. I'm starting to think the aftermarket tb is the reason for my car stalling.
 
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