Engine Pinging/Knocking - Page 2 - JK-Forum.com - The top destination for Jeep JK and JL Wrangler news, rumors, and discussion

06-16-2009, 04:19 AM

#11

ronjenx

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Quote:

Originally Posted by johanswift

Ok, checked all the plugs - they seem fine. I think the pinging started when they reprogrammed the Engine control unit during my 24k service. Still, I would have thought that a knock sensor would prevent the ping. Not sure the 3.8 is fitted with one though..

The JK does have a knock sensor. It can compensate for knock, to a limit. If your engine is knocking, it could be beyond the program's limit of adjustment.
Don't let it go too long. It's not good for the engine.

Knocking should set a code and light the MIL.

When Monitored:
This monitor runs above 2000 rpm, under open throttle conditions. The Knock diagnostic does not run at idle or during decelerations. The high voltage test runs all the times the engine is running.

Set Condition:
The PCM detects the Knock Sensor voltage out of limits. Two Trip Fault. Three good trips to turn off the MIL.

Last edited by ronjenx; 06-16-2009 at 04:28 AM.

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