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Old 07-20-2012, 01:45 AM   #1
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Default NA burning oil and fouling plug… hmmm

ok, so i changed my oil about 4 weeks ago. i started to hear some tapping from the top end and assumed it was a lifter…. nope, 2 quarts low!!!! WTF! no leaks, no noticeable smoking… the hell?

i changed the plugs, this is what i found…

the nasty one came from cylinder 3. the white specs could be caused by knock, the rest of the plugs looked great. i replaced the plugs with Densos.

a week later i pulled the plugs to check them out, look at cylinder 3 again…



i did a compression check, 180psi across all 4.

the sutty plugs could be a faulty injector, (none of the plugs were oily)
i pulled all four injectors and cleaned them. i put injector 3 in #1 spot to see if the problem follows the injector.

while i have my injectors off, i figured id check the manifold for oil… this is what i found:




and touching the TB blade i get this…




my car is 100% stock minus a cone filter that i installed tonight. i had just replaced the PCV valve with the Densos. all emissions are intact (i assume thats where the sutty black came from the manifold)

i really need to figure out if the plug and the oil are one in the same. i can't have an oil leak/burn killing my octane rating and causing knock when i go FI.
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Old 07-20-2012, 02:16 AM   #2
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ive just been brain storming here
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Old 07-20-2012, 02:18 AM   #3
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Do a leak down test...that will reveal ALOT.
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Old 07-20-2012, 03:59 AM   #4
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Leakdown. I don't even own a compression tester.
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Old 07-20-2012, 11:50 AM   #5
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Put a leak on dat ----, son.
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Old 07-31-2012, 02:23 PM   #6
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So I was going through the garage, found the compression tester. Pull the one way valve out and hook it to a compressor... Bam leak down!
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Old 07-31-2012, 02:44 PM   #7
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Quote:
Originally Posted by zumin View Post
So I was going through the garage, found the compression tester. Pull the one way valve out and hook it to a compressor... Bam leak down!
Don't tell us the results.
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Old 07-31-2012, 03:05 PM   #8
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I won't.
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Old 07-31-2012, 05:26 PM   #9
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EGR delete.

Clean manifold with vacuum line and a can of B-12, or sea foam.

Run it like a raped ape to keep plugs klean, I mean, leak down test for the win.
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Old 07-31-2012, 06:11 PM   #10
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I want to do the EGR delete but I'd prefer to do it when I get megasquirt.

Need to get a leak down tester. I've got a few friends with shops who will let me borrow. But it's a must right now for sure
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Old 07-31-2012, 07:51 PM   #11
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Why does that first pic of the fouled plug look like it has more washers on it?

And run ngks you dumbass.
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Old 08-01-2012, 03:19 AM   #12
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Denso is just fine. i only paid 5$ for the set of platinums, why waste money on good plugs if they're probably going to foul out?

cylinder still gets a little black compared to the others. its not bad. ive cleaned the injectors, installed a new fuel filter, and pug in plug wires after i noticed a little surge when cruising around 3-4k. ill put another couple of tanks through it on new plugs and see what i get.
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Old 08-01-2012, 11:17 AM   #13
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You still didn't answer the question as to why the original fouled plug seems to have three washers on it?
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Old 08-01-2012, 03:32 PM   #14
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You're looking at the base of the plug. It has no washer on it at all because it fell off in the hole.
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