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Old 10-17-2011, 12:39 AM   #1
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Changed spark plugs now problem

Just got done swapping out the NGK plugs for Autolite DPP985s. All the NGKs were gapped at .050 and larger.

We gapped the DPP985s to .035 and installed. No problems until I started it up. Its starts up better than it did before but now it sounds like not all the cylinders are firing.

I haven't taken it out for a spin yet (worried I will make it worse). What should I look at before taking it out?

The other things we did today was changed the oil, brake rotors and pads.

Tomorrow we were going to do the differentials but now we may have bigger problems.

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Old 10-17-2011, 01:29 AM   #2
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Check your coil rail. Alot of times one boot can slide to the side or not get seated well.

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Old 10-17-2011, 01:36 AM   #3
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Sounds like you might have mixed up the spark plug wires. ie #5 on #6 etc. Done that before myself.....
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Old 10-17-2011, 02:01 AM   #4
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Quote:
Originally Posted by drjay View Post
Sounds like you might have mixed up the spark plug wires. ie #5 on #6 etc. Done that before myself.....
Hard to do on an 06 with a coil rail....lol

Did you double-check your gaps on all your plugs or just assume they were gapped at .035 like they're *supposed* to be? Other than that, I'd pull your coil rail off and make sure the boots go on each plug and then make sure they're on all the way. I think 03Ruth is probably right.
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Old 10-17-2011, 02:35 AM   #5
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My wife double checked all the gaps. All but one was .035 and she fixed the one that was off.

I took the coil rack three times thinking I must have missed with a boot but everything was fine. I'll check again in the morning to see if maybe one is not seated all the way down.

Anything else it could be?
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Old 10-17-2011, 04:20 AM   #6
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It could be a bad spark plug just not working.

Find otu what cylinder is not firing and then swap that plug out with another cylinder. If that one then does not fire then you have found your issue.
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Old 10-17-2011, 04:50 AM   #7
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You put dielectric grease on the ends.

With my 01 the coil rail would not seat properly and I would get misfiring.

The smart folks at AZ hooked me up with the grease. Everything was fine for another few thousand miles and I had to replace the rail itself. Jeep had 160,000.
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Old 10-17-2011, 04:55 AM   #8
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When the engine is cold..Have the hood up ahead of time, then start the engine and let it idle for about 20 seconds, then shut it off and run around and feel the manifold to see which cyl's didn't fire.

Another is to hook-up your timing light to each cyl one by one and shine the light at your face and observe each of the flashes. At idle, the flashes will be a regular pattern. Sometimes "bad" wires or even just 1 "bad" wire, won't show up until you move them around.
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Old 10-17-2011, 10:24 AM   #9
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one of the new plugs may be bad.
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Old 10-17-2011, 10:32 AM   #10
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I'll bet your coil is just goin bad
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Old 10-17-2011, 05:13 PM   #11
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I second the check the coil rail. I did the same thing and missed the last plug closest to the cabin when I put the rail on. Made for a rough ride. haha
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Old 10-17-2011, 09:26 PM   #12
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Well the verdict is in. I put all the old spark plugs back in and no more missing.

But.........

I took it for a test drive and it sputtered once and the CEL came on. Reader had two codes P0700 and P0882.

Oh and to top it all off I now have an oil leak from the pan. There's a bolt missing from the pan and its leaking from the front edge of the pan lol.

Damn Jeep
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Old 10-17-2011, 09:59 PM   #13
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P0882 - TCM Power Input Signal Low

P0700 - Transaxle Control System Malfunction

Hope this helps with the codes... But the plugs thing is kinda weird but with the stuffer you mentioned still sounds like your coil rail going out could be wrong tho

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