Join Date: Dec 2002
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Re: 185/195 degree thermostats: Reduce Pings
I doubt that the lower temp thermostat will do anything for you. At best, it will just mask the real problem. The first thing I would check is the timing adjustment. A timing too far advanced will cause pinging. When I set my timing on my older (carburated and non-computer) cars, I initially set it to what the manual specifies, then I take the car out on an open road, advance the timing slightly, step on the gas from a dead stop and repeat the process until I get a ping. Then I back off the timing about 1 degree and I am at the optimum timing for my engine. Also, check your vacuum advance connections to the distributor to make sure that everything is hooked up correctly. You can check the vacuum advance with a timing light while pulling a vacuum on the distributor diaphragm and check it against specifications (usually around 10 degrees or so). If that still doesn't work, then remove the distributor, take it to a performance shop and have them check the mechanical advance curve on a special machine.