Question about 1998 GMC Sonoma
For over a year whenever the truck is first started (engine cold) it runs rough if pushing on the gas. Slight bucking when driving and letting up on gas pedal. Most noticable at highway speeds. Starts fine. Not noticed if just idling. Clears up after driving for about 10-15 minutes. No check engine light on. Had to a dealer off an on for a month. They did a "major" tune-up. Problem still there. They say they checked everything fuel related. They gave up.
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Posted on Jan 02, 2017
SOURCE: Sierra 3500HD rough idle
do a good tune up it is not the tranny . you might think about a good diagnostic test to make sure it is not a senser it is hard to say for me onless i could look the truck over my self . good luck
Posted on May 18, 2008
SOURCE: Engine starts then dies
Probably MAF. Mass air flow sensor, or idle control system/ sensor.
I have actually heard of some people having this problem because of a faulty heat sending unit, which doesn't show up on scan, but i'm still betting on the MAF. Good luck, let me know what you find.
Posted on Jun 22, 2009
A 1999 Yukon DOES NOT have a vacuum advance. It is computer controlled timing. Low oil pressure is the result of some or all of the following : worn oil pump, worn cam bearings, worn crank bearings. Oil pressure also normally drops as engine warms because the viscosity of the oil changes with temperature.
Posted on Feb 23, 2010
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Car overheats and Air blows hot at idle? http://howtobyme.blogspot.com/2011/11/car-overheats-and-air-blows-hot-at-idle.html
------While stop engine idles like cylinder missing? http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html
---------This will help.Thanks.
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