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Old June 6th, 2003, 14:24
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martin martin is offline
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Join Date: Mar 2003
Location: Huntsville, AL
Posts: 910
Hawaii,

If you are getting a preignition knock then you I would look into replacing the knock sensor. On the non-HO engines their is a knock sensor, so if you get a ping when going up a hill go get a new one.

I will warn you it is a dealer only item, it cost me around $75 two years ago but made a big difference in how the XJ ran. The knock sensor is located on the driver's side of the block about an inch above the oil pan. It looks like an oxygen sensor with the white shaft. The knock sensor uses the same connector as does your fuel injectors. The new one is a different style but included in the package are instructions on how to install it.

An 88 XJ 4.0 should never ping due to poor quality gasoline, if it does then the knock sensor is bad.

Martin
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