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Posted: Thu Nov 02, 2006 1:58 pm
by jules
I advanced my timing to 14 degrees and it induced pinging under load. I have used Premium 98 for 4 years now and the car does not ping at all.

I would try using Premium, and see if it still pings. If it doesn't, then I would warm the car up first and then wring the life out of it for a few km's somewhere safe. Next time you fill up then go back to regular and see if it is still pinging.

All this advice is making the assumption that the timing is set at factory spec of 10 degrees.

Jules

Posted: Thu Nov 02, 2006 2:03 pm
by Garry
You could try changing to a cooler spark plug. It may have the wrong ones fitted or just need a cooler plug for your operating conditions.

Posted: Thu Nov 02, 2006 5:22 pm
by AJ
i'd go for OEM spec ones as a starting point........... :)

Posted: Thu Nov 02, 2006 5:32 pm
by JBT
From the NGK website http://www.ngkspark.com.au/ Check out the FAQs about fouling, overheating and temp range.

Your Vehicle:
01/98 - on Mazda MX5 1.8L DOHC NB8C
Spark Plug Part No.
Recommended Plug BKR5E-11
Plug Gap 1.1 mm