Is the noise on start up and take off normal for the KJ engine? Actually it sounds like an exhaust leak but goes away on acceleration.

What your calling "noise" is actually MUSIC

It's a diesel thing

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Atlantic Blue 06 CRD Limited (his)
Joined by a 2000 XJ Classic (hers)

If you haven't already done so, change your oil and use the specified synthetic oil, ASAP.

My engine was excessively noisy when I purchased it. The previous owner cheaped out and used conventional motor oil instead of synthetic. He was sick and tired of the money he was putting into it and just didn't care anymore, so the vehicle suffered and was a sick puppy when I got her.

The motor quieted down when I flushed it and began using the specified synthetic oil.

Also get rid of the Oem muffler and install a 2.5" in and 2.5" out flow thru muffler to tame the beast. A Dynomax UltraFlo muffler is inexpensive and works best or you can always straight pipe it as some have done.

The motor smoothed down even more with the GDE tune.

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2006 Liberty Limited CRD, Deep Beryl Green, Yeti tune, Arp studs, new cams, rockers, lifters, TB. "Green Monster"
2005 Liberty Sport CRD, Deep Beryl Green, GDE Hot Tune, ARP studs. "Rocket"
1982 Fiat 124 Spider Convertible. "Fiona"