Not sure about chips 4 the 4.2efi, i'm sure there probable is, but with the ECU conected to a laptop and the right software you can change parameters in the ECU anyway ( so i am lead 2 believe ) so don't really see the point for a chip.
The location of the ECU, will be behind some plastics ( well not in my case ), on the front passenger side fire wall?, Under the glove box, some pics to show you anyway![]()





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