New Wires/Plugs and still throwing P304
Thread Starter
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Drifting
Joined: Jun 2009
Posts: 40
Likes: 1
Fixed
We can now shatter the myth that coil packs go bad in pairs of cylinders. For reference, I had a misfire on cylinder 4 - P0304. I replaced the coil pack and it runs fantastic! I bought a pair of used coil packs off of ebay for $29 + $10 shipping.
The job wasn't bad. Just take your time and make sure you have the rave CD manual so you can see the exploded view of the bolts you need to remove.
While I had the upper plenum off I found the slight coolant leak under the throttle body. Replaced the gasket.
Thanks for everyone's help!
The job wasn't bad. Just take your time and make sure you have the rave CD manual so you can see the exploded view of the bolts you need to remove.
While I had the upper plenum off I found the slight coolant leak under the throttle body. Replaced the gasket.
Thanks for everyone's help!
Last edited by Foe; Dec 9, 2009 at 11:17 PM.
Thread Starter
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Drifting
Joined: Jun 2009
Posts: 40
Likes: 1
Coil pack
Here's where I got the coil pack if you need a cheap deal http://cgi.ebay.com/ebaymotors/Land-...Q5fAccessories
Overlanding
Joined: Jan 2010
Posts: 24
Likes: 1
From: Dallas, TX
and.... it was the coil for me too. now the disco runs like a champ again.
after doing back to back the wire installation without removing the intake and with removing the intake, I'd say it's a much "cleaner" job if you remove the intake
after doing back to back the wire installation without removing the intake and with removing the intake, I'd say it's a much "cleaner" job if you remove the intake
Winching
Joined: Jul 2006
Posts: 739
Likes: 5
From: west of chicago
I am starting to see a pattern, we have had a rash of people do a tune up using those plugs and they all have had a single cylinder mis fire that cannot be tracked down or cured.
Do yourself a favor and go and buy Champion plugs, the cheap copper ones and put those in the truck, clear the code and see what happens.
I am betting that your mis fire goes away.
Do yourself a favor and go and buy Champion plugs, the cheap copper ones and put those in the truck, clear the code and see what happens.
I am betting that your mis fire goes away.
ya beat me to it.
luck,greg
Winching
Joined: Aug 2010
Posts: 655
Likes: 0
From: Charlotte NC
Makes sense. The coil pack sits right up against the engine block. Prob got too hot or too wet over the years and went bad like a lot of other things on a V8 4x4 truck. I always replaced dist caps when I would do cables and plugs on my jeeps 
That's awesome you found and fixed it man.
Now come show me how to take all that stuff off so I can replace my valve cover gaskets.
That's awesome you found and fixed it man.
Now come show me how to take all that stuff off so I can replace my valve cover gaskets.
Drifting
Joined: Dec 2010
Posts: 42
Likes: 0
From: Lexington, KY
I, too, have a cyl 4 misfire that comes and goes. I have magnecore 8s on the way, but should I consider changing the coils at the same time to save myself the effort down the road? Or have some people resolved this issue with just the wires?
Winching
Joined: Jun 2009
Posts: 692
Likes: 9
When does it happen? Only in the morning/cold start?