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2002 Dodge Intrepid pinging

I've got a 2002 Dodge Intrepid that is pinging way too much. I've switched to premium fuel and that helped a bit at first, but it is still pinging too much. Vehicle has 145K miles.

A mechanic who saw the car suggested that the combustion chamber has taken on carbon and that has increased the compression ratio.

There really isn't much to maintain on that engine. The plugs are new; the engine doesn't have a distributor or wires; air filter is new. I don't think there are any air/vacuum leaks as it idles smoothly. Replacing the plugs didn't make any difference; try ones in a colder heat range? Does the engine have a knock sensor? Web searches seem to indicate that Dodge quit using one in 2002.

Reply to
AZ Nomad
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I know you've checked the timing and just forgot to mention it.

Reply to
clifto

A plugged EGR passage or an inoperative EGR valve will cause excessive pinging. So will a disconnected (bad connection?) or failed (not likely) knock sensor.

Reply to
Steve

Timing isn't adjustable on these vehicles, and the spark isn't even directly tied to the cam position. The cam sensor tells the computer

*which* cylinder is about to fire next, but the actual firing event is based on the crankshaft position sensor. So, within limits, a timing belt being off a tooth or two won't even affect ignition timing.
Reply to
Steve

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