Hypo questions - '01XJ vs. '99XJ

[go4lo]

Just a hypothetical question.

IF I had a 2001 XJ 4.0lL, Auto and a 1999 XJ 4.7L Stroker, Auto and wanted to swap the motors between the 2 vehicles what problems would I enconter with the changes in model years. I "think" that the underhood harness' would be the only difference between the 2 models. The '99 still uses a distributor and one CAT and long tube headers, where the '01 uses the distributorless ignition with coil packs and warm up cats on a two piece header.

Are the CPUs different OR could I simply swap the underhood harness from one vehicle to the other?

Just kicking around some ideas as my wife and I are planning to have kids soon, God willing, and would need a vehicle with more room than the MJ has but I would like to keep my Stroker if possible.

[amcinstaller]

ship the whole thing up her and ill trade you for a bunch of stroker parts so you can still have it! lol

[SilverXJ]

The two things you have to worry about are the exhaust manifold and coil rail mounts. The manifold on the 01 will cover up a lot of the 99's head's exhaust ports and leave very little room to seal. I would suggest trying a header for the 2001 just to make it easier on dealing with the down pipe and the cali emissions package if you have it. The coil rail mounts are easy, just run a strap from the valve cover bolts to the coil rail. Done. The cam sensor on the 01 will drop in the block, and use the 01 wiring and any sensors that may be different. IIRC there is something different about the oil pressure sensor. I would also recommend larger injectors though.

[gradon]

I haven't come across the info yet, and I could be wrong, but I'd assume you'd have to use the coil rail pcm with the coil rail and the dizzy pcm with the dizzy setup.