An engine can ping for many different reasons. Here is a list of the most common causes for pinging starting with the most popular ones.
Fuel octane rating too low.
Compression to high. (usually caused by carbon build up inside the combustion chambers)
Over heating of the engine or just an individual cylinder. (Hot spots)
Knock detector faulty.
Ignition timing over advanced due to incorrect setting or erratic ignition due to a worn distributor. Most modern engines no longer have distributors.
Blocked exhaust, giving a high backpressure. (A significant loss of performance will be noticed)
And yes, I spend a lot of time deleting useless posts... many of which are yours
how do the dealer's expect us to get the cars there if they don 't run at all?
When I last worked as a mechanic in the ritzy River Oaks section of Houston, I was often brought Cadillacs and Lincolns that "make that horrible noise when I push the gas"...Most of them were never driven over 25 mph so, after a hard run on the feeder roads to blow what I could out and get it hot, I got it back to the shop for a dose of Dr. Truckman's secret elixir...
On the carbureted ones, I just poured my 50/50 mixture of Dexron and ice-cold water down the carburetor throat while holding a high idle and when almost gone I dumped it down the intake to kill the engine...For those who don't think ATF and water will mix, it will mix long enough for use if shaken vigorously...After letting it cool off for an hour or so, I drove it on the freeway long enough to clear the smoke out, and voila, no more carbonized combustion chambers and no more ping...The little old ladies were happy again...
For the late model fuel injected cars, I had a pipe that plugged into the large vacuum port for the brake booster and, using a valve, got my mixture in the engine through that...The bonus was there were no more mosquitoes near the shop for a while... ...Ben
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