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Rough Idle

47K views 10 replies 7 participants last post by  JennaBear 
#1 ·
My truck idles rough, it doesnt rev down or anything, just when it sits still it shakes. not sure what it is. no codes. it seems it kind of loops... anything?
 
#4 ·
The only "common" thing that comes to mind is water in the fuel. Then that water would surround the #7 or #8 fuel inj and cause a miss. But that situation DOES cause the engine light to come on witha P0300 misfire code. You say you have no light? That to me shounds like maybe an engine mount problem?
 
#7 ·
i also have a problem with my truck on cold or rainy days my truck runs like crap but on hott days it runs great. and also my truck will not idel right until it hit operanting temp i have replace the coolant temp sensor and the egr valve i have a 92 chevy k-1500 with a 350 if any one any idea of what this is caused by please let me know thatnk you
 
#10 ·
Your engine's knock sensors will cause it to idle rough when it is cold (same thing happened on my dad's Yukon). Usually you will get a code for them... You can even try disconnecting the wiring harness for the knock sensors to see if that helps (never tried it). The knock sensors are under the intake manifold.
When I was doing my dad's Yukon one of the sensors was so corroded I had to drill two holes in it and use my needle nose pliers to twist it out because the nut stripped.
 
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