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- - 1jz over fueling (http://www.toyota-supra.info/forums/mkiii-supra/18901-1jz-over-fueling.html)

Quote:

Originally Posted by cre (Post 93997)

No, extra rich fuel and reduction in timing is a function of the ECU in the presence of ping and knock. If you have changed the octane of the fuel you're using and the climate hasn't changed significantly a ping could be bad news; If it's gotten hotter and/or drier and you aren't using a high octane fuel you may want to try it and see if performance improves.

How did you test the MAP sensor and the IAT sensor?

well iv had this over fueling ploblem with a while and could not get it sorted . so i went and bought another 1jz car that was running perfect and swaped engine and everything in to mine and it running the exact same as my old engine was

What are you basing the diagnosis on? Mileage, backfiring, Air/Fuel gauge (in which case wide band or narrow?).

Have you tried running with the O2 sensor disconnected? Mileage that way should be CLOSE to stock. I'm assuming the engine has an O2 sensor..

What shape is the cooling system in?