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RX-7 2nd Gen Specific (1986-92) RX-7 1986-92 Discussion including performance modifications and technical support sections.

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Old 12-17-2012, 12:55 AM   #1
RETed
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Originally Posted by JustJeff View Post
One thing I forgot to mention. I had always assumed the fouling plugs is due to coolant seal leak. Thoughts on this?
Yes, coolant on the spark plug tips will kill them in short order.

You can do a quick & dirty test with a DMM...
Measure resistance from the spark plug wire end to the center electrode (in combustion chamber).
Check this same measurement on one of the brand new spark plugs.
The used spark plug should be *less* in resistance due to the center electrode wear down slightly.
If the spark plug is "fouled", the resistance is going to be significantly higher.
I forget what what these NGK BUR/EQ's spec around, but the number 1.1k-ohm sticks in my head?
Don't quote me on that...


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Last edited by RETed; 12-17-2012 at 12:59 AM.
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Old 12-17-2012, 03:08 AM   #2
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Quote:
Originally Posted by RETed View Post
Yes, coolant on the spark plug tips will kill them in short order.

You can do a quick & dirty test with a DMM...
Measure resistance from the spark plug wire end to the center electrode (in combustion chamber).
Check this same measurement on one of the brand new spark plugs.
The used spark plug should be *less* in resistance due to the center electrode wear down slightly.
If the spark plug is "fouled", the resistance is going to be significantly higher.
I forget what what these NGK BUR/EQ's spec around, but the number 1.1k-ohm sticks in my head?
Don't quote me on that...


-Ted
That's some pretty resourceful thinking. Plugs will be here Tues. and I'll get some measurements and report back.
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