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scout 07-09-2010 08:51 AM

Info re: WJ 4.7 HO engine
Could someone advise what is the difference between the Knock Sensors and the Detonation Sensor in the HO engine? What do they do or control?

Thanks Trev

Scottina06 07-09-2010 11:40 AM

Re: Info re: WJ 4.7 HO engine
so the 4.7 ho has both these sensors? Knock and detonation are the same. Knock or detonation is when the air/fuel mixture explodes with spark...but then a secondary explosion happens. It usually occurs when there is unburned fuel present in the chamber.

Frango100 07-09-2010 11:46 AM

Re: Info re: WJ 4.7 HO engine
As far as i could find in the WJ service manual there are only 2 knock sensors on the HO engine. I could not find anything regarding detonation sensors.

scjeep4.7HO 07-09-2010 12:13 PM

Re: Info re: WJ 4.7 HO engine
The stereo knock sensors in the 4.7HO pick up the detonation and should retard the timing to combat it.

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