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Old 07-09-2010, 09:01 PM   #1
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Idle Speed Ctrl Motor/AKA clicking noise from engine

Hi again. I posted on here about a month ago about a clicking or clacking noise coming from the engine of my 2002 TJ. Everyone who responded had great and very insightful ideas as to what the noise could be. To me it sounded like my taser, a spark sound. Thought it could be a plug wire arcing over or something like that. Next it was possible lifters or the coil pak.

Well hallelujah !!!!!! Today I took the TJ in and had the oil changed and plugs changed out ( i just don't have time with my schedule). My guy finally traced the noise and found it.

The little grey topped thingy where the distrubutor would normally be. It is wired to the coil pak. When you place you finger on it while the engine is running and clicking you can feel the clicking there.

So finally the great mystery is solved !! looks like it is $25 to $45 part etc.

I hope this helps out others. And thanks to all who chimed in with great ideas.

I don't know what years have this goofy coil pak thing but it seems to be a real pain in the pooper for now.

2002 TJ Sport 4.0 116 k miles

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Old 07-11-2010, 01:37 PM   #2
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I don't think that's the idle speed control motor... as far as I know, the only idle anything on the Wrangler is the IAC (idle air controller) which is on the back of the throttle body.

I think it's the camshaft position sensor...but not 100% sure on that.

You're talking the light gray thing down low beneath the coil rail on the passenger side of the engine?

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Old 07-11-2010, 07:49 PM   #3
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Yeah thats the thing. I tried to look it up and thats all I could find. BUt that lil bugger is where all the clicky clacky spark noise is coming from.
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Old 07-11-2010, 10:57 PM   #4
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Well damn... I checked mine earlier hoping that was the source of my click, but I didn't notice any clicking noise coming from it or feel a tap when I set my finger on it. Is it super noticeable or did you have to use the ol' screwdriver stethoscope on it?
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Old 07-15-2010, 10:14 AM   #5
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It was very noticeable with just a touch. with the engine running just reach down and touch it, you will feel it.

I had it replaced yesterday. You were right it was the cam shaft/oil pump shaft thing, along with the sensor on top. Turns out it was loose, the overall shaft. It is a two piece set up with the shaft inside of a sleeve. The teeth on the shaft were in very good shaft, no nicks or burrs etc. Darn thing I guess was "wore out" after 116 K miles. seems the top of the shaft was wearing the contact with the sensor. That is where the clicky noise is coming from.

My mechanic ordered a replacement, I means cost is cost. It came in and as it turns out it was made in china, and did not fit correctly. GO FIGURE. SO he had to get one from the local jeep dealership. Cost was $270.00 vs $85.00. But like everything else, you get what you pay for. After that everything fit like a glove. It was a quick repair.

Sorry for the lack of technical terms but I just don't know all the names for this stuff. On my '64 3B its so easy to look and say, thats the volt regulator and so on.

But the end result, no more noise, and by using a factory part I know it will hold up and be one less issue in the future.
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