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Intermittent when starting the engine it revs up and down and then stalls

Tiny
ROGERJAL17
  • MEMBER
  • 2009 PONTIAC G6
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 104,214 MILES
No check engine light. But when I start the car sometimes the rpm will rev up and down and stall out unless I hurry and put it in park then I can drive and it doesn't stall at all. This also always does not happen it is intermittent. Whats the issue. I recently replaced both solenoids and the crankshaft as well
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Saturday, March 7th, 2020 AT 8:00 AM

2 Replies

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Let's check for codes first. If there are no codes then I suspect we have one of two issues. Either the throttle needs to be learned (process attached) or we have a sensor issue.

Just so I am clear, the vehicle starts and idles fine but when you put it in hear, it will act up and stall unless you get it back in park? If this is the case it is because of the load from the transmission which is most likely a sensor issue.

If there are codes let me know what they are. If no codes then try the learn process and let me know what happens.
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Saturday, March 7th, 2020 AT 8:23 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Here is a guide to help you get the codes:

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Also it sounds like the throttle bore needs service if you haven't done this already here is a guide to help you:

https://www.2carpros.com/articles/throttle-actuator-service

Please run down these guides and report back.
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Monday, March 9th, 2020 AT 12:56 PM

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