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Spark Plug Diagnosis

widebody180

By widebody180,
in General Maintenance

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widebody180 Collaborator

widebody180

Posted
Posted

Ok here is a picture of my spark plugs, I just pulled them out to examine them. Been in my R32 GTR for approx 3 months now. Previously it had iridium in there but I just wanted coppers, because I pull them out every time I servie anyway to inspect so thought I might as well replace them every time. Now, I think they look pretty good, slight discoloration which I think I spot on for 3 months of use. The only thing I noticed out of place is that the plug that came out of number 1 cylinder looks really clean compared to the others. Here is a pic anyway. Tell me what you think.

post-55599-1252640545_thumb.jpg

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Sheriff Wan Proficient

Sheriff Wan

Posted
Posted

Are you using an additive?

Looks as if the one on the left hasn't even been touched...

It doesnt look lean - it would be alot worse if it was and the car would show other signs like detonation.....

What type of plugs are you using as they may be too cold for the type of driving you do?

Don Dada Mentor

Don Dada

Posted
Posted

The one on the left looks like ALL the plugs in my R33 rb26 ie. looks like its straight out the box.

I run BKR7 @ 11.5psi most of the time and 13.5psi high boost. with the wideband hitting 12:1 at about 4500rpm and goes to 10.6:1 at 7200rpm -stock ecu.

Is this a sign that the plugs are too cold???

U definitely have a problem though as all plugs suppose to show the same burn.

What plugs do u use?

U should get ur injectors cleaned and flow tested.

Dose Pipe Sutututu Grand Master

Dose Pipe Sutututu

Posted
Posted

looks like an injector problem, just take them out and down to your local spares shop, they should be able to clean, supply new pintle caps for under $30.00 each.

as for smell, I think using 7 range is overkill, I was using 6 range plugs @1.3bar/18PSI

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