Engine Stalling at low RPM - Car Troubleshooting


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Engine Stalling at low RPM

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CobaltOwner82
New User

Sep 23, 2016, 7:03 PM

Post #1 of 3 (1408 views)

Engine Stalling at low RPM	Sign In

Make: Chevy
Model: Cobalt LS
Year: 2005
Mileage: 120000

So I'm having this problem with my engine stalling at low RPM. The RPM goes to 0 and the engine shuts off.

This only happens when travelling at low speeds (e.g. slowly accelerating from a stop, braking, moving in stop and go traffic)

This NEVER happens when I'm travelling above 10 mph (e.g. if I'm coasting at 40 and let my foot off the gas, the RPM can go to 500 RPM but it will never stall in this case).

After the stall, I can always put the car in park, turn the ignition and it will turn back on again.

I have not noticed any electrical problems that occur when this happens (the radio stays on during the stall and the lights don't dim).

My car was part of that Chevy ignition switch recall, but I took it to the dealership which (hopefully) repaired it.

Any input would be most appreciated!

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Sep 24, 2016, 1:53 AM

Post #2 of 3 (1398 views)

Re: Engine Stalling at low RPM	Sign In

Codes could really help and post #s found even if no light is lit.

How long ago was this recall done? If just recently it could have had battery disconnected and is re-learning how NOT to stall at idle and should quit that if that alone. Did you need to reset anything after that repair? Radio stations, clock or anything?

Other is vacuum leaks, cleaning throttle body well for starters then a host of checks.

Codes first or if just recently from the recall work take it back,

T

Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Sep 24, 2016, 8:41 AM

Post #3 of 3 (1387 views)

Re: Engine Stalling at low RPM	Sign In

That is an electronic "drive by wire" so all you can do is clean it. There is no IAC that can be replaced. You would have to replace the whole throttle body if the cleaning doesn't work.

. Remove the intake snorkel, have someone hold the throttle wide open for you and scrub the back side of the throttle plate and surrounding bore with an old tooth brush and some carb cleaner. Be sure to spray some into the small holes next to the throttle plate. That should help stabilize the idle.

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