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3.7 rough idle ......

5K views 2 replies 2 participants last post by  constableal 
#1 · (Edited)
as the title states, Ive been experiencing a rough idle at well ....idle. replaced spark plugs with appropriate NGK Iridium. And still not much of a change. no CEL's as of yet. What is my next step in solving this problem? Thanks in advance for any and all advice offered. Also, truck has only 24,500 miles.........very low for a 5 year old vehicle.
 
#2 ·
I would wan't the check the OBDII misfire monitors to see if it can pinpoint a particular cylinder. You'd need an appropriate scan tool to do this. There's a few potential causes and plugs are rarely the issue when a vehicle has low miles. You could have carbon buildup on the intake valves, a sticking valve, a burnt valve (pretty unlikely, though), an injector spray pattern issue, coil pack, or PCV valve sticking open.
 
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