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What causes this?

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Joe

I live here!

Joined: Sat Jul 04, 2009 11:30 pm
Posts: 49041
Location: Rockingham W.A
Vehicle: JB74

Posted: Wed Dec 22, 2010 2:43 am

Yesturday arvo my car (96 vitara efi) developed a bit of a missfire when under load only every now and then so i got new spark plugs and missfire is gone

but looking at the plugs i took out there is oil on the thread and black crap around the top of the threaded bit

but the bit that sparks is sort of white

These plugs are about 15,000 to 20,000 kms old if that helps

Cheers Joe

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zooky08

az supporter

Joined: Fri Nov 27, 2009 10:30 pm
Posts: 3426
Location: imbil/gympie. qld
Vehicle: 03 Jimny

Posted: Wed Dec 22, 2010 3:09 am

oil or fuel additives, bad fuel, might be oil ash

Joe

I live here!

Joined: Sat Jul 04, 2009 11:30 pm
Posts: 49041
Location: Rockingham W.A
Vehicle: JB74

Posted: Wed Dec 22, 2010 3:30 am

zooky08 wrote:

oil or fuel additives, bad fuel, might be oil ash

When it started to miss yesturday i put in a bottle of injector cleaner
Im more worried about the oil on the thread and the black crap on the top

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stockman

az supporter

Joined: Thu Nov 05, 2009 10:30 pm
Posts: 5319
Location: Canberra
Vehicle: 4wd

Posted: Wed Dec 22, 2010 3:38 am

The oil on the out side and on the thread could be coming from the rocker cover.

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Joe

I live here!

Joined: Sat Jul 04, 2009 11:30 pm
Posts: 49041
Location: Rockingham W.A
Vehicle: JB74

Posted: Wed Dec 22, 2010 3:39 am

stockman wrote:

The oil on the out side and on the thread could be coming from the rocker cover.

Nah no leaks that i can see

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royce

omnipotent being

Joined: Sun Jun 11, 2006 11:30 pm
Posts: 17216
Location: Pluto

Posted: Wed Dec 22, 2010 3:43 am

under the rocker cover there are 4 little rubber washers that seal between the cover and the tubes the sparkplugs sit in, they are leaking into the tubes, which also then shorts out the ends of the leads

Joe

I live here!

Joined: Sat Jul 04, 2009 11:30 pm
Posts: 49041
Location: Rockingham W.A
Vehicle: JB74

Posted: Wed Dec 22, 2010 3:51 am

Bugger

ill pull it apart and fix it once ive moved house then

Cheers

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