Re: non HO to HO swap?
Originally Posted by badassgc
Hi all ive got ? i just got a 2000WJ with a blown none HO 4.7 motor my ? is what is involved in doing the HO swap? .. I already have a 03 4.7 HO motor i just need to know whats involved .....
Well I believe the 4.7L HO has Knock sensors that automatically control the engines timing as its designed to run on 91 octane. If you put a cheaper grade in, knock sensors pick that up and re-calibrate for it. if you were to swap it you would have to always ensure you're running atleast 91 octane fuel or swap over the ECU if you got that as well.
If you want to use the HO parts to upgrade your stock motor, swap over the cams and the intake and the intake manifold (i think?) and get a tune and that should make it pretty similar to the HO 4.7L.
Again I'm not entirely sure on all this, but it should give you a good starting point. If you could clarify, do you have the ECU (computer) for the new high output engine?
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