Car Stalls at a red light. No codes. Could it be my throttle body? - Pontiac G6 Forum
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post #1 of 12 (permalink) Old 10-05-2018, 03:39 PM Thread Starter
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Car Stalls at a red light. No codes. Could it be my throttle body?

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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post #2 of 12 (permalink) Old 10-05-2018, 04:18 PM
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Do you have the old TB to put back on to troubleshoot?
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post #3 of 12 (permalink) Old 10-05-2018, 07:53 PM
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Check serpentine belt...


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post #4 of 12 (permalink) Old 10-05-2018, 08:54 PM Thread Starter
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Tomorrow morning I was going to test drive my car using the old Throttle Body to see if it causes the car to stall. I will also take pictures of the serpintine belt and both new and old throttle bodies.
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post #5 of 12 (permalink) Old 10-06-2018, 02:40 PM Thread Starter
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Quote:
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Do you have the old TB to put back on to troubleshoot?
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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post #6 of 12 (permalink) Old 10-06-2018, 02:43 PM Thread Starter
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Quote:
Originally Posted by Nlandolina View Post
Check serpentine belt...


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Here's pictures of my old tb, new tb, and belt.

https://imgur.com/a/MvCfzD9
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post #7 of 12 (permalink) Old 10-21-2018, 04:10 AM
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The belt may not have proper tension... Aka slipping. It's usually due to poor materials in the belt manufacturing or chemicals on the belt


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post #8 of 12 (permalink) Old 10-21-2018, 08:38 AM
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A slipping belt cannot cause the engine to stall.

Keep the old TB on. Drive the car and see what happens.
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post #9 of 12 (permalink) Old 10-29-2018, 03:12 AM
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More than likely you are looking at a mechanical fuel issue. Most anything else would trip a code.
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post #10 of 12 (permalink) Old 10-29-2018, 03:15 AM
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Also best not to clean T.B.. At most just a good wipe down on the air cleaner side. You can use T.B. cleaner but don't spray into the intake/T.B. butterfly. Just spray on a rag and wipe it down best you can.
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post #11 of 12 (permalink) Old 12-05-2018, 06:17 AM
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Quote:
Originally Posted by dxG6 View Post
A slipping belt cannot cause the engine to stall.



Keep the old TB on. Drive the car and see what happens.


It did on the G6 I had, the belt wasn't spinning the alternator and causing the car to die giving it fuel from the light.


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post #12 of 12 (permalink) Old 12-16-2018, 09:49 AM
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Does you scan tool do scan enhanced codes? I just posted a new thread about my 08 stalling at a red light and P1682 , ignition circuit, popped up. I know some scan tools may not read all codes, just a thought. Did you get your issue resolved?

08' G6 Sedan, 2.4L Auto 174,800 miles

Last edited by gruvedaddy; 12-16-2018 at 09:50 AM. Reason: typo
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