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Old 05-25-2011, 01:46 PM
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Coil pack arcing?

Often, when i first start up the Jeep, i will hear an intermittent "snap" that sounds a heck of alot like a loose plug wire arcing to ground. I have an '04 with the coil pack though... no distributor and no wires. This is the first vehicle with a coil pack i've owned, and i don't want to mess around with it yet if i don't have to. Has anyone observed these symptoms?

-On a cold start, i'll get some random sharp "snaps".
-Sometimes three or four in a row, half a second apart, sometimes one every few seconds.
-Seems to go away after 30-60 seconds
-Engine does not stumble as if a cylinder misfired.
-No codes.

If i get around to it i'll try starting it at night with all the lights of and look for a spark. I haven't seen anything unusual under the hood during daylight hours.

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Old 05-25-2011, 02:29 PM   #2
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That's one of the symptoms the coil rail is failing - inside. It'll get worse.
But first do as you say, it may just need new boot.

You can get the "knock-offs" - cheap imitations for a little less than a real one, but they don't last long.
CarQuest, NAPA or the dealer ($$$) has real ones.

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Old 05-25-2011, 03:00 PM   #3
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^ replaced mine with help from this guy.
Hell of an improvement overall with the new rail. Bought mine at Napa.
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Old 05-25-2011, 07:20 PM
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Alright, i was more worried about the complexity of the coil rail than i needed to be. After you guys confirmed coil rail was probably the culprit, i went and pulled mine off. There was quite a bit of junk in the spark plug wells (one extra crispy spider, too) and some dulling/corrosion on the plug heads. I cleaned all that up, put some dielectric grease on the plug heads, and stuck the rail back on.

No snapping!

It's pretty humid today though, which would reduce the effect anyway. I'll listen again on a dry day, and replace the coil rail when i do the plugs if need be.
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Old 05-26-2011, 12:03 AM   #6
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Those damn spiders, they killed one of the hamsters in mine now I only get 8mpg
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Old 05-26-2011, 08:38 AM   #7
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Quote:
Originally Posted by meyers
Those damn spiders, they killed one of the hamsters in mine now I only get 8mpg
You have to grease the wheel, good for squeaks too
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Old 05-26-2011, 08:59 AM   #8
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Quote:
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Those damn spiders, they killed one of the hamsters in mine now I only get 8mpg
I give my hamsters expresso... works pretty good too...
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Old 01-04-2013, 08:23 PM   #10
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I have the same problem....mine has been popping.
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Old 01-04-2013, 08:24 PM   #11
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at an idle it sounds like a vacuum leak.
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Old 01-04-2013, 08:24 PM   #12
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What are the symptons of a failed boot???

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