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Old 09-20-2012, 04:05 AM
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4.7 HO swap issue

Hi guys,
new to JeepGarage, I've been on JF for the longest time, but i thought I'd broaden my horizons. anyways, here is my situation: I've looked over and over and over again between the 3 big Jeep forums, this one included, and I haven't found a clear answer to my question(s). I have an '02 Limited that just recently threw a valve in the standard 4.7 (at 280k nonetheless!) and I have a 4.7 HO engine with matching harness and PCM, already buttoned up in the vehicle, and the tranny was flashed long ago to 545RFE. So I have two things I need clarified if possible, A: How can I make it run like it came from the factory with an HO? Can I program the factory HO file into the PCM with my 'N' VIN with the Chrysler DRBIII tool? I don't want shortcuts, I want the knock sensors plugged in and working, seeing as i have the matching harness and PCM and I want it running like a true HO. and B: it does start up as is, however, it intermittently dies out at idle. Any other possibilities besides cleaning the IAC valve? I was going to run train on cleaning the whole throttle body tomorrow and doing a fuel injection service. Any input is greatly appreciated, I'm hoping to get her running ASAP to determine the possible need for warranty on the engine (it's from a junkyard). Thanks a bunch!
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Old 09-20-2012, 10:00 PM
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Re: 4.7 HO swap issue

If you have the HO harness already installed then use the HO pcm but you're gonna have to go to the dealer anyway to have it programed to your skim module if your Jeep uses the grey keys. Either way it's a trip to the dealer but if you want it too run like an HO I'd stick with the HO pcm.
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