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Old 08-15-2007, 06:39 PM   #1 (permalink)
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White residue all over spark plugs....why?

In my experience, whenever you have white on a spark plug, its burning lean. So what's up with this? What would cause it? Should I be worried? 1995 Geo Prizm (Toyota Corolla) bone stock 1.8L I4. Still running great with no known problems at 230,000. Plugs have probably been in there for 1.5 years / 40,000 miles.

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Old 08-15-2007, 06:44 PM   #2 (permalink)
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Maybe it was running rich or burning oil, and then quit??
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Old 08-15-2007, 06:44 PM   #3 (permalink)
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it means you need to stop driving like a old lady.
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Old 08-15-2007, 07:06 PM   #4 (permalink)
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It burns about a quart of oil per 1000 miles and its never quit.
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2011 TTF buggy that goes fast and crawls and jumps and stuff...

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Old 08-15-2007, 07:07 PM   #5 (permalink)
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Quote:
Originally Posted by svt150j49 View Post
it means you need to stop driving like a old lady.
You have no idea. I beat the piss out of this car every single day and it just keeping going, and going, and getting 38 MPG doing it.
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Old 08-15-2007, 09:01 PM   #6 (permalink)
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Quote:
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You have no idea. I beat the piss out of this car every single day and it just keeping going, and going, and getting 38 MPG doing it.
So STFU, put the plugs back in it, and run it!
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Old 08-15-2007, 09:04 PM   #7 (permalink)
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Looks like your running hard gas.
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Old 08-15-2007, 09:19 PM   #8 (permalink)
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Usually thats caused by additives.
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Old 08-15-2007, 09:21 PM   #9 (permalink)
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oil Deposits( burnt ash)
The accumulation of deposits on the firing end is influenced by oil leakage, fuel quality and the engine's operating duration.

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Old 08-15-2007, 09:25 PM   #10 (permalink)
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You're running lean as fuck! Thats why.
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Old 08-15-2007, 09:42 PM   #11 (permalink)
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It looks like what's said above: it's burning a little oil, and modern 4 cylinders run leaner than shit on the freeway to get the mileage. You could maybe step up to a hotter plug if it's fouling, otherwise wire brush those and put them back in if you're a cheap bastard, or buy a new set at the parts store.
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Old 08-15-2007, 10:09 PM   #12 (permalink)
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id say oil. ive seen the additives, they look more redish when it burns...ive got a B2200, it did the same thing... burning oil.
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Old 08-16-2007, 02:00 AM   #13 (permalink)
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Overheated:
On this symptom you will notice a chalky appearance, white insulator, rapid electrode wear as well as an absence of deposits. The actual shell may also be discolored.
To cure this you must first verify that the plug is the correct heat range, the ignition timing settings are correct, the air/fuel mixture is not too lean, there are no vacuum leaks and that the EGR valve (if equipped) is functioning properly.


Ash Deposits
These are light-brownish deposits that are encrusted to the ground and/or center electrode(s). This situation is caused by oil and/or fuel additives. This condition can cause misfires.
The cure for this is to verify worn valve guides or valve seals, not using fuel additives, or you might even try changing fuel brands. By the way, a hotter plug is what most people try to fix this problem. You need to first understand that the plug is NOT typically the problem.
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Old 08-16-2007, 03:41 AM   #14 (permalink)
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Thanks for the suggestions. Looks like I'll just keep to the plan: run it until it dies.
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Old 08-16-2007, 06:34 AM   #15 (permalink)
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Geo tech? WTF
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Old 08-16-2007, 08:48 AM   #16 (permalink)
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put better plugs in it too.
ngk or denso.
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