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Discussion Starter #1
looking to upgrade my 4.2 to fuel injection looking to put multi-point efi
looking at kit online if any body has done this would like to talk to you
will do this about nov. HAVE QUESTIONS NEED HELP :banghead: :banghead:
 

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I'm not to smart on this, but I was going to pull a 4.0 head and all the EFI components out of a junkyard jeep and put them in my 4.2 jeep. might be cheaper and you can stock parts if something breaks
 

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First thing to understand about the MOPAR MPFI kit is that it is not recommended for use on worn out/older 4.2L engines, as the higher compression ratio will increase the likelihood of detonation. This is MOPAR's recommendation, not the random ramblings of the internet. If your 4.2L has been recently subjected to a full rebuild, it should be able to handle the MPFI.

Here is the installation manual for the MOPAR MPFI kit

Crappy PDF quality, but the instructions are there.
 

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Discussion Starter #4
Thanks on that the motor was complete rebuild about 2000 miles ago
 
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