when I put the key in ignition it starts and when I take my foot off the gas it stalls

2005 BUICK RENDEZVOUS
145,000 MILES • 1.8L • 4 CYL • AWD • AUTOMATIC
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JUDY MASON
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  • 1 POST
Whenever I start my car eight out of ten times when I put the key in ignition it starts and when I take my foot off the gas it stalls. No engine lite comes on. If I rev-up the engine it usually will stay running and not stall out. I have had a mechanic check it out and he could not find the problem. Do you have any idea what could be wrong?
Oct 8, 2016 at 5:54 AM
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JIS001
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 3,412 POSTS
There is no 1.8L for this vehicle. If you have the 3.4L engine then replacing the idle air control valve should fix the problem. If you have the 3.6L engine then have your mechanic clean the throttle body since the 3.6L is drive by wire system.

After cleaning the throttle he will need a compatible scanner to relearn the idle. Sometimes the worse case scenario if it will not learn the idle then an ECM software update will need to be done so verify with your mechanic that he can actually do the repair. If he cannot then you will need to find another shop that could.
Oct 8, 2016 at 7:24 AM
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HMAC300
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 48,601 POSTS
try cleaning throttle plate on both sides and IAC hole with choke cleaner. if it continues check fuel pressure with a gauge auto parts rent it. here is an article on it.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
Oct 8, 2016 at 7:24 AM