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Old 10-17-2007, 12:28 AM
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Default #5 Cylinder Misfire Detected

I was driving along when the engine shook things up a little it was missing and then things went smooth again. The check engine light came on and the code was P0305: Cylinder #5 misfire detected. I changed the spark plugs even though the looked fine. Got some Bosch Fusion plugs for it. The wires looked fine. But then it did it again. P3035 and P0300: Random Misfire Detected. It is a very rare occurance and it seems to do it after a cold start. Any thing I should check or any recommendations? Thanks in advance.
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Old 10-17-2007, 06:39 AM
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Default RE: #5 Cylinder Misfire Detected

How many miles on the truck, what year, and when were the wires last changed? I would suspect the wires if it has been a long time since they were changed. Easy and cheap change-out.
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Old 10-17-2007, 08:12 AM
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Default RE: #5 Cylinder Misfire Detected

So how many miles?????
You can't just look at a plug wire and assume they are OK, kinda goes back to the old saying about assuming things. Probably a real good chance you need a set of 8mm Magnacor wires to get you out of this issue.
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Old 10-18-2007, 01:18 PM
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Default RE: #5 Cylinder Misfire Detected

140K. I will get new wires and report back. Thanks.
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Old 10-18-2007, 03:00 PM
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Default RE: #5 Cylinder Misfire Detected

Don't go buy wires at the auto parts store, you'll just have more problems. Order a set of 8mm Magnacor wires from Tony at Cerrones. One of the best wires for your Disco and Ton't has about the best price on-line.
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Old 10-18-2007, 06:52 PM
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Default RE: #5 Cylinder Misfire Detected

I am glad I read this before I went out and bought them. Do you have a web address for me? Thanks.
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Old 10-18-2007, 07:09 PM
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Default RE: #5 Cylinder Misfire Detected

What year? They are still $30 cheaper than Tony @ www.Apexperformance.net.I got them from here and they were pretty fast getting here. They were the right wires too, 8MM PN# 80142.
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Old 10-18-2007, 07:13 PM
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Default RE: #5 Cylinder Misfire Detected


Quote:
ORIGINAL: xb70valkarye

I am glad I read this before I went out and bought them. Do you have a web address for me? Thanks.
http://www.lrrforums.com/ or call Tony at 650-365-4145
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Old 10-22-2007, 04:48 PM
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Default RE: #5 Cylinder Misfire Detected

I have the old P305 code too. I got my Magna 8MM's ordered from Apex last week. Hope to have them soon. Nice can of BG44 coming too (thanks OKDiscoGuy) I'll let you know how it turned out.

Mike - OKDiscoguy - How easy it it to DYI on changing out the wires. I have no room at all behind there. Literally its like 4 inches max to fit my hand. I don't want to have to start taking stuff off unless I have to.
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Old 10-22-2007, 04:58 PM
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Default RE: #5 Cylinder Misfire Detected

Do you have secondary air, an emission control device that runs pipes behind the engine?? If so it is hell, other wise I would suggest you crawl up on top of the engine and pull one wire at a time, it is alot better them paying just under $200 in labor.
Don't use the 44K until you are ready to take a couple hour drive, it works much better that way.
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03, 13, 2003, 2007, codes, colorado, cts, cyl, cylinder, cylinler, detected, discovery, land, misfire, p0305, rover

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