[TRADERMIKE 2012]

Originally Posted by steve25

With your posted results from your compression tests and the timing you are now using without any vacuum advance I flat out can't see how you could be having pinging taking place at or near idle.

You must have something mechanical at low cycling rates, making the noise you are hearing.

A good possibility to me would be that if the car uses an auto trans. that your noise source is a busted Flex-plate.

Depending on where and how they are cracked I have heard them sound like tight rusted noises bolt being backed out to what as in your case might be sounding like ping, and many times the noise will go away by 1800 to 2200 rpm out of gear.

Very interesting thought, my roommate could/should have seen a problem when he R+R the Trans., one never knows. What if Crack developed Post Build though, that could have happened. We intend on inspecting the inspection cover soon, checking for leaks. Sometimes we get some oil on the exhaust system and it burns off at the stop light. We had an Accident with the Trans. two years ago, sending a shock wave through the Drive Train, linearly from the Trans. to the Harmonic Balancer Hub. It Broke the Torque Converter, Trans., why not the Flexplate it is on line with the rest of those parts to Brake. We will inspect it, thank you. Mike out.

P.S. Does the Flexplate need to be Magna- fluxed for inspection?