Rough idle at startup

Tiny
KC27
  • MEMBER
  • 2008 GMC CANYON
  • 3.7L
  • 5 CYL
  • 4WD
  • AUTOMATIC
  • 130,000 MILES
When starting the truck, it sometimes idles real bad, almost like it'll stall or something. After about 5 seconds though it goes back to normal, drives fine afterwards. Have changed the fuel injectors before due to them clogging from debris and often smell gas from the engine area. Also swapped the throttle and a lot of sensors. No idea why it idles bad though. Also, strangely this doesn't happen in the winter or temperatures below freezing.
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Tuesday, March 30th, 2021 AT 2:16 PM

1 Reply

Tiny
KASEKENNY
  • EXPERT
More then likely you have a vacuum leak that is causing all these issues.

Here is a guide that will help with performing these tests to find it:

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Also, here is a guide that talks about a vehicle that stalls at idle. I understand your vehicle is not actually stalling but the issues are pretty similar to what you are seeing.

https://www.2carpros.com/articles/stall-at-idle

Let's run through this material and let us know if you find a leak and we can go from there. Thanks
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Thursday, April 1st, 2021 AT 11:03 AM

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