Thread: Rough idle
View Single Post
  #5  
Old 05-22-2013, 09:05 PM
DaveInDenver's Avatar
DaveInDenver DaveInDenver is offline
Hard Core 4+
 
Join Date: Jun 2006
Location: Larimer County
Posts: 6,380
Default

Could the motor sound be something like the alternator or PS pump? Maybe one of them is failing, causing an intermittent drag on the engine. Stab in the dark on that since nothing is coming to mind that would be a motor. It's not like our trucks have ABS systems or anything.

BTW, there is also a timer that controls the cold start injector that can fail.

From the sound of it I might check the EGR and IAC, although an intermittent O2 light might be a clue. If the ECU is chasing a variable O2 feedback that would also explain the poor running at altitude.
__________________
'91 Pickup

"Why does the U.S. care which flag will be hoisted on a small piece of land thousands of miles away?" -- Ron Paul
Reply With Quote