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Spark Plug Diagnostics

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Sixa View Drop Down
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    Posted: 28áSepá2011 at 11:58pm
Spark plugs are EXCELLENT for helping diagnose issues with petrol engines, and regular checking can help catch things early.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Sixa Quote  Post ReplyReply Direct Link To This Post Posted: 28áSepá2011 at 11:59pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Doug999 Quote  Post ReplyReply Direct Link To This Post Posted: 29áSepá2011 at 11:59am
When checking your spark plugs you also need to take into account your driving circumstances.
A car with a sound engine doing regular and long motorway trips will produce a 'greyish' deposit at the spark gap.  But the same engine only doing short trips will produce 'wet oily' deposits as the engine will never heat up to its optimum temp.

I've regularly had to tell the kids  "there is nothing wrong with the BL**dy engine......its your right foot that's the problem!" Angry  


Edited by Doug999 - 29áSepá2011 at 12:02pm
2012 Tekna 1.6L, Arctic White, Stone Leather
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Sixa Quote  Post ReplyReply Direct Link To This Post Posted: 29áSepá2011 at 9:05pm

Speaking of oil, if you ever have a leak a good idea is to put down AL-Foil and park the car over it. The foil won't soak up the oil so you'll get the perfect colour of the drip, which will help you work out if it also includes anything else; such as coolant.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Sixa Quote  Post ReplyReply Direct Link To This Post Posted: 30áSepá2011 at 12:00am
Originally posted by Doug999 Doug999 wrote:

When checking your spark plugs you also need to take into account your driving circumstances.
A car with a sound engine doing regular and long motorway trips will produce a 'greyish' deposit at the spark gap.  But the same engine only doing short trips will produce 'wet oily' deposits as the engine will never heat up to its optimum temp.
I have never ever seen a wet oily deposit on the spark plugs of a good motor.
If you have oil in the combustion chamber then you have problems with your rings at the least.
Even on a turbo car, where oil vapour is sent back through the intake you shouldn't see shouldn't see this.
 
As for greyish deposit, once again, it should be dark and sooty. Greyish/white says to me that you're burning coolant. But hey, I could be wrong :P
 
If you've got a mixture of both, then its possible you've got a f'd head gasket.
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