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Hey y’all, the Ram is having intermittent hiccups at idle. Changed the spark plugs today and the cylinders seem to be burning great. Ever since I got the truck it’s had this weird intermittent problem only at idle where it will start to run very rough, shake and sputter as if it had a badly tuned carburetor. No CEL and no pending/history codes when plugging my scanner in, however when reading data, the LTFT reads -33% when the problem happens! Very rich for some reason pulling ALOT of fuel. From the throttle body is a loud hiss when this occurs as well which I can only assume the IAC. It corrects itself on its own or when I step on the throttle. Sticky IAC perhaps? This is the 318(5.2). I haven’t done much on the truck yet aside from a basic tuneup, oil change and compressor clutch.
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[quote=”cap269″ post=144060]My gut feeling is IAC also.[/quote] It appears we were both wrong.
Today, the idle was horrible and the issue occured much more frequently, so bad that it set a check engine light. P0306…oh joy.
I dug deeper into it today. I pulled apart the throttle body including the IAC and everything checked out. Retorqued that stuff and proceeded to do a compression test on cylinder 6 to rule out a mechanical issue. Got 160 psi on the gauge, so good on that front. Started the truck bad up and the rough idle was gone. At this point, I feel it is either a partially clogged injector or more likely, a spark or electrical issue. Thoughts?EDIT: For the record I have not yet replaced spark plug wires, coil or dizzy cap and rotor. Unsure of how long they have been on the truck.
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