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Jul 25, 2009 | 01:47 PM

turn7

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Thanks

I don't post but, I do read. I changed the plugs and coils on my truck for the first time. I bought it new in Sept. of 98 and have over 207,000 miles on it.

I've been procrastinating on the job for the last but, in the last week it developed a bad misfire so, I was forced to get the job done.

This is what plugs look like with that many miles on them. They're pretty white which I am guessing it is from the misfire from bad coils on 4,5, and 6 and subsequent leaning of the motor since the oxygen sensor was detecting high levels of O2 being that destination wasn't occurring. Maybe not??

Since 3 coils crapped their pants all at once I figured that I had reached the useful life on all of them and got 10 new coils and plugs.

#4 and 5 were a pain in the backside to get to. Hopefully these will last another 150-200K.

Jul 25, 2009 | 03:17 PM

JKBrad

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Joined: May 2005

Posts: 8,230

Likes: 1,247

From: San Antonio, TX

Wow, you like to get the maximun value out of your parts.

Look at those gaps! You could throw a cat through them.

No wonder the coils took a crap.

Jul 25, 2009 | 04:06 PM

Fordfanatic4life

Postmaster

Joined: Oct 2008

Posts: 3,924

Likes: 6

From: Richmond BC

looks like u had alot of standing water in teh plug holes to..

luckily the plugs came out freindly...

p.s. i cant beleive u managed 200K miles on a original set of plugs.. thats a real testament to the durability of the Ford engines..

Jul 25, 2009 | 06:05 PM

turn7

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A couple had some rust on the tops of them but most of the rust is because we had a rain shower move through while I was 8/10th's of the way through and I finished up the remaining 2 3days later. Notice that 2 don't have rust on the threads? Those are the two that didn't get wet from the rain. The other 8 had sat out on the back of my Jeep for a few days before the picture was taken.

I checked the gap on the old plugs and they averaged about .070. So yeah, that's probably why the coils went bad.

Any way, thanks again to all the folks that offer up technical info here.