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Unread 10-28-2003, 08:01 AM   #1
ccyoder
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Spark Plug Trivia

Alright everyone. Who's the expert who can figure this one out?

I have a 99 JGCL 4.0L with the infinity sound system. Shortly after I bought the jeep, I began to tune it and first changed out the air filter and plugs. I took the old plugs out and replaced them with a set of champion platinum plugs, gapped to .35 as spec'd.

Following the plug change, at idle, my infinity tweeters began to cut in and out, as if someone was jiggling some lose wires. But this only happened at idle and only in the tweeters. So I checked all conections in the amp, radio, speakers, etc and everything was good.

Because the coincidence of it all, I pulled the plugs back out to make sure nothing was over/under gapped and put them back in, thinking an overgapped plug may cause some sort of voltage drop that affected the stereo. A week later, I pulled them once more and they looked fine, except that number 3 and 6 looked a little too carbon coated for two weeks of use and put them back in. While I was pulling the plugs the second time, I dropped two of them onto a hard tile floor. By visual inspection, they both looked fine, so I put them back in, but I could tell by the way the engine ran that something was a little of---and of course, the tweeters still cut in and out at idle.

Long story short, I bought and installed new bosch platinum plugs and replaced all six champion plugs. the result? The jeep runs great and the tweeters in the dash no longer cut in and out at idle.

So who's the spark plug master whose going to figure this one out?

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Unread 10-28-2003, 01:20 PM   #2
iroc22
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I heard of that happening with wires that have poor RFI surpression, not plugs however.
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Unread 10-28-2003, 01:36 PM   #3
ccyoder
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Quote:
Originally Posted by iroc22
I heard of that happening with wires that have poor RFI surpression, not plugs however.
What's RFI surpression? Should I replace the coil pack (I think that's what its called) that tells the plugs to spark?
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Unread 10-28-2003, 03:12 PM   #4
ccyoder
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Quote:
Originally Posted by ccyoder
What's RFI surpression? Should I replace the coil pack (I think that's what its called) that tells the plugs to spark?
Okay. I'v done some research on RFI supression and will just leave the bosch plugs in. Thanks for your help.
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Unread 10-28-2003, 04:30 PM   #5
BostonBull
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I say....

CHAMPION plugs SUCK ***!!!!! Thats your problem!!
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Unread 10-29-2003, 04:36 PM   #6
imnotu
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how much did those bosch platinum plugs cost you... ?
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Unread 10-30-2003, 07:34 AM   #7
ccyoder
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Quote:
Originally Posted by imnotu
how much did those bosch platinum plugs cost you... ?
The bosch plats cost about 2.25 each. I should add that I usually just stick to cooper core plugs, especially for a jeep engine, but the bosch plats in there now make the jeep run much better/smoother/quieter than the mopar/autolite and champion plugs that I've had in there before. I haven't tried the plat2 or plat 4's yet, and am not sure that I will. I"ll probably just stay with the standard plats next tune up, unless I hear some convincing evidence in this forum that there's a significant performance increase in the plat2/4 plugs.
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