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  #1  
Old December 15th, 2006, 09:22 PM
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Neil McCauley
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4.2 ECU Swap

Hey all, I got a question and I couldn't find an answer from search. I might be able to get my hands on an entire 4.2 ECU Box from a wrecked Range Rover Classic. Could I just do a simple swap instead of actually opening them up and changing the chips? It would make things a lot easier but I"m worried that there may be issues seeing how one was designed for an auto and my d90 is stick. Any help is appreciated thanks.

Neil
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  #2  
Old December 15th, 2006, 09:45 PM
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I have plugged and played with a 4.2 ecu in a 3.9 but didnt do it for long term use
dont see where it would be an issue. It wont hurt anything to just try it and see otherwise its only a few screws to change the proms. Any chance the cam is still good in the RR while you still have your engine apart, that would make the ecu a little happier
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Old December 15th, 2006, 10:30 PM
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Go to a range rover dealer in your area and get a prom for a 94 lwb 4.2. It was like $20.00 and it worked great. I have a stick in mine and no prooblems with the automatic tune . I put it in 1999 with a 3.9 then i switched the motor to the 4.2l with a cam. The hardest part was getting it to idle without the check engine light coming on. The base idle had to be set 150 RPM s higger then the book stated Due to the cam. Once i got that dialed in it worked perfetly. Just rember there is no to speed limitter at 85 MPH I think the 4.2l limiter is 115 mph.
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Old December 16th, 2006, 02:38 AM
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Well hell if its only 20 bucks to buy the 4.2 chip at the dealer than I'd rather just do that instead of buying this guy's entire ecu. This is not similiar to the disco 1 cold start chip mentioned in other threads right? The motor in my truck is the 3.9 but a 4.0 with a 4.2 cam is going in very soon. Would it be a good idea to use the 4.2 chip with the 4.0/4.2 cam? I'm also curious if the 4.2 ecu would give any improvement in the 3.9. Any help is appreciated! Cheers



Neil
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Old December 18th, 2006, 08:46 AM
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"4.2l limiter is 115 mph."

Untrue. No limiter only rpm governor . . . at least on my chip anyway.
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