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Can Your Read This Plug For Me? ....please...

GD51LA

By GD51LA,
in Engines & Forced Induction

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The Dan Grand Master

The Dan

Posted
Posted
Looks quite rich fouled. Also is the crush washer crushed? What heat range.

How is that rich fouled?

The black around the ring is normal for any turboed engine. The center is where you should be looking

:/ Damn, I thought he did a pretty good job as it is! lol

Yeah I was joking lmao

rob82 Mentor

rob82

Posted
Posted
How is that rich fouled?

The black around the ring is normal for any turboed engine. The center is where you should be looking

Yeah I was joking lmao

It looks as tho its been rich fouled and then it has partially cleaned up. Hence the heavy carbon layer around the plug end.

Supa Steve Enthusiast

Supa Steve

Posted
Posted (edited)
It looks as tho its been rich fouled and then it has partially cleaned up. Hence the heavy carbon layer around the plug end.

This post is pretty close to the mark but without running the engine right to get a proper plug read the results can be decieving. Need to see the ground strap to get an idea of heat range/timing and also cut the thread off it to get a look at the fuel line. This looks fairly rich that has been cleaned up by the car idleing hence the clean porcelain near the electrode but again the plug has been in the engine too long to correctly read as there is quite a thick carbon build up. I hope thats not aluminium deposits i can see (silver spots) and if so there has been some detanation causing the edge of the quench pad to be deposited on the base ring . Throw a fresh set of plugs in and do a full noise run then shut it down before it returns to idle as this will allow the plug to be read accurately.

Edited by Supa Steve
The Dan Grand Master

The Dan

Posted
Posted
It looks as tho its been rich fouled and then it has partially cleaned up. Hence the heavy carbon layer around the plug end.

rich - yes.....fouled - no

Pull out any turbo spark plug and it will look like that. The black is normal. The centre of the plug tells you what condition the cylinder is running in. White is lean and black is rich, light brown is perfect. If it has deposits on the outer and/or centre electrode (which it does have tiny amounts) it would usually indicate poor fuel quality/additives or slight burning of oil but I think it would be fuel moreso in this case

The Dan Grand Master

The Dan

Posted
Posted
This post is pretty close to the mark but without running the engine right to get a proper plug read the results can be decieving. Need to see the ground strap to get an idea of heat range/timing and also cut the thread off it to get a look at the fuel line. This looks like its a rich tune that has been cleaned up at idle hence the clean porcelain near the electrode. A proper run then shutdown will allow the plug to be read accurately.

This is also true but still normal for these engines to run rich at peak torque or midrange. Anything less will usually kill them

rob82 Mentor

rob82

Posted
Posted (edited)
rich - yes.....fouled - no

Pull out any turbo spark plug and it will look like that. The black is normal. The centre of the plug tells you what condition the cylinder is running in. White is lean and black is rich, light brown is perfect. If it has deposits on the outer and/or centre electrode (which it does have tiny amounts) it would usually indicate poor fuel quality/additives or slight burning of oil but I think it would be fuel moreso in this case

That amount of carbon build up around the thread end is not normal - I would be very dubious of the tune and or too colder plug.

If my tune resulted in a plug that read like that I would concerned.

Edited by rob82
GD51LA Mentor

GD51LA

Posted
  • Author
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some fat feedback boys. as usual :P

those shots were taken from my new canon camera :happy: i thought it would need a great picture for us to read it properly

ok so i put in a new plug, drive it to 8k then turn it off, right?

no tune, its completely standard just exhaust/front pipes/5cat..

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