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Idling and running problems when warm

Tiny
GREENFISH
  • MEMBER
  • 2000 CHEVROLET SILVERADO
  • 109,000 MILES
Truck starts fine and runs good until it is warm. Then it will drop idle at a stop sign or light to roughly 400 or even 300 rpms. It will die have to start and hold idle at about 5 to 500 rpms to make it run also noticed today it wants to***** like it is losing spark or fuel not sue of which as no error codes or any lights will come on- After it cools everything is fine and will run ok until it warms up all filters including fuel are new as of 1 week ago Idles slow at about 400 when warm and in park
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Wednesday, December 14th, 2011 AT 10:07 PM

2 Replies

Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
Many have reported success by cleaning MAF sensor and throttle body.
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Wednesday, December 14th, 2011 AT 10:33 PM
Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
Also this.
Check to determine if the PCM calibration has been previously updated to one that includes the update for throttle body coking. For 2003 model year vehicles, look in the operating system portion of the calibration. For 2000-2002 model year vehicles, look in the engine portion of the calibration. If not, then update the PCM calibration to the latest calibration.
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Wednesday, December 14th, 2011 AT 10:51 PM

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