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melibokus 12-04-2010 11:23 AM

changing plugs - coil pack seating
After changing the plugs on an '08 4.7 V8 , reinstalling the coil packs and they just seem wrong to me. There's no "snap" as when you push traditional spark plug wires onto the spark plug. Does the coil plug wire just sit on top of the plug?

Another hour and I'll have it all back together (along with my new "fastman" TB).

burntPiston 12-04-2010 11:34 AM

Re: changing plugs - coil pack seating
It's a spring contact, not a snap fit.

Mine loved its new plugs!

SCguy 12-04-2010 11:36 AM

Re: changing plugs - coil pack seating
Yep, that is perfectly normal. My 4.7 HO loved new plugs too. At 124k, I had assumed that they had been replaced already, but they hadn't.


4.whoa 12-04-2010 11:46 AM

Re: changing plugs - coil pack seating
The 5.7 is the same way. At first I was like Oh Crap :eek:

melibokus 12-04-2010 12:57 PM

Re: changing plugs - coil pack seating
Thanks all, that makes me feel a lot better. I do have another problem though - the boot on one of the coil over's detached itself and stayed wrapped around the spark plug. So I have 7 of 8 plugs changed and just left that one plug where it is. I decided to hold off on the new TB until I can get this last problem fixed.

It looks like I might be able to attach the boot back onto the coil over but I might destroy the boot trying to free it. I think I should buy a spare complete coil over assembly just-in-case before I attempt to do this last one. Has anyone else had the same problem and how did you get the boot out?

thanks - Mark

burntPiston 12-04-2010 01:01 PM

Re: changing plugs - coil pack seating
2 of mine tore off. I slid a couple of picks between the boot and plug, then a little shot of wd40 in the void. Work that around a bit and they popped right off.

melibokus 12-04-2010 01:08 PM

Re: changing plugs - coil pack seating
Thanks - that sounds like a good way to do it, make some space between the spark plug and the boot itself. I'll give it a go.

melibokus 12-05-2010 06:51 PM

Re: changing plugs - coil pack seating
It took 2 hours and lots of toothpicks but it looks like that method could have worked, just not on this plug. In the end I had to tear out the boot. Looking at the plug and boot afterwards and it looks like the boot had melted to the insulator. All the plugs showed some small boot material stuck to them but this one plug had a dime+ sized piece of boot welded to it.

I ordered a new coil on plug ignition coil assembly from checker autoparts (it was less than $30 and looks like an exact match - it could be the OEM part). I couldn't get just the boot itself from anywhere so modified a coil on plug insulator "omnispark" brand that checker also sells. It seems to work but I couldn't get a perfect fit. Autozone had nothing but I could have probably modified one of their "Duralast" boots to fit. If anyone knows a part number for just the boot & spring I'll pick some spares up ahead of the next 30K miles (that's just over a year for me).

melibokus 12-12-2010 08:09 PM

Re: changing plugs - coil pack seating
I replaced my homemade boot with the complete replacement coil-on-plug assembly. The part is BWD E1101 and looks identical to the OEM part but probably costs much less (under $30 from Checker AutoParts). I don't know if they make them yet, but I'm searching for spare exact-match boots so I'll be ready for the next plug change.

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