Coil packs and Rhythmic Idle Vibration

GrassFed

New member
Howdy you 3rd gen gurus,

I was hoping I could tap into the database here for a moment. In short, here's what I have. from about 1-1.5k RPM I have a rhythmic vibration that I would say is pretty harsh. I can feel it faintly at slightly higher RPMs as well before it seems to disappear completely. Granted that could mean a thousand different things to different people, that's how I'd describe it. Still runs really well, has plenty of throttle response and smooth power throughout the range.

On a side note, for what it's worth, In the mornings it cranks long and fires up strong. Although, after I have run it around and fire it up again, it'll crank strong, but fires up really weak. Hope that makes a little bit of sense.



I pulled the coil packs to find two of them looking like the pictures provided, and one of the wires that plugs into the pack looked the same way. Does this look like it could be a possibility to the symptoms I'm experiencing? I suspect it does, but figured I'd post on here first to see what kind of things you all have had luck with.

Recent maintenance -

Wires, Plugs, Fuel filter.


What do you all think?

Thank you in advance for the help.
 

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Was his resolved? I am experiencing a shudder at idle. I have researched many threads on this site as others have experienced a similar issue. For me, no codes are being produced.
 
I also have had issues. Recently had to change out an injector and now I have a rythmic idle once in a while. And every so often on my drive home itll misfire after sooo long. And once in a while Ill lose a cylinder. Im hoping its not another injector as those are a pain to get to. Im gonna change all 3 coilpacks and see if thats the issue. If not Ill just change out all the injectors too. I have 300k on mine so electrical/ignition stuff should be bound to wear out.
 
Here are the FSM instructions to test the coil packs using a multimeter. Scroll down to page 5.

If there aren't any pending codes & you are experiencing any shuddering, hesitation, bucking, or idle issues, this is just a reminder to do the simpler maintenance stuff first if it hasn't been done in the last ~30k:

spark plugs
spark plug wires if they look rough
clean MAF
clean throttle body
pcv valve/hose/grommet
check air intake tube for cracks

If the issues you're experiencing continue, then start investigating the more involved/complex stuff.
 
Yessir.....items below have been done within the last 8k miles with the exception of intake tube inspection. Thanks for the docs! Engine runs good with the exception of the shudder in gear at idle.

Here are the FSM instructions to test the coil packs using a multimeter. Scroll down to page 5.

If there aren't any pending codes & you are experiencing any shuddering, hesitation, bucking, or idle issues, this is just a reminder to do the simpler maintenance stuff first if it hasn't been done in the last ~30k:

spark plugs
spark plug wires if they look rough
clean MAF
clean throttle body
pcv valve/hose/grommet
check air intake tube for cracks

If the issues you're experiencing continue, then start investigating the more involved/complex stuff.
 

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