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Old 04-08-2008, 11:49 AM   #1
Natedogg
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Default Plug wire problem

For those with Relays/SV6s/Uplanders/Terrazas I have found an issue with the plug wires that come across the top of the engine and go to cylinders 2/4/ and 6.

The wires come across the top of the engine, cross over a coolant pipe with a welded bracket on it. #2 and 4 rest right on the welds which causes them to rub and arc. If you pull the wires up you will see the burning marks on them.

This would be a good reason for the slight misfire I have complained about and the poor gas mileage that the dealer deemed "no problem found." I have ordered a new set of Bosch wires and I will also be replacing the plugs and going with a .052" gap instead of the recommended .060" gap.

The only way to fix this would be to replace the wires and cover the #2,4, and 6 wires with split loom since they also rub on the top of the intake manifold. I will also try to rework the bracket so they don't rub at all.

Just some info I figured I'd share. GM's engineering on this vehicle has been piss poor at best. I have had to buy aftermarket parts and re-engineer so many things to make it how it was supposed to be, and so far it's working. It's a much more enjoyable vehicle to drive now. The latest thing to be replaced is the sway bar links. The stocks started rattling at 38,000 miles, and at 41,000 I replaced them with Napa sway bar links. The Napa links have joints that are more than twice the size and the shaft is twice as big in diameter. It made a huge difference in how it handles.

Nate

...
95' SL2 Turbo
2001 Lexus IS300 with light mods
2005 Pontiac Montana SV6 - Fixing it myself this time!

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Old 04-14-2008, 12:55 PM   #2
Natedogg
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Default Re: Plug wire problem

This weekend, the plug wires got so bad that my mileage on the highway is down to 15 and it felt like I was towing an extra 5000 lbs. I had to take the wires out of the loom and let them hang away from each other. The #2 wire now has a burn mark from arcing about 1" long half way around the wire.

I had to cancel my order for the Bosch wires and go with the Napa Belden wires. I will be picking them up tomorrow. Parts America was playing games with me on delivery times and I wasn't waiting any more.

Nate

...
95' SL2 Turbo
2001 Lexus IS300 with light mods
2005 Pontiac Montana SV6 - Fixing it myself this time!

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