Sick little Hachi

[Mux213]

cab,

You mention you had a decat on it. Pardom my lack of terminology here but does that mean some sort of cat replacement or no catalitic converter at all?

I think nohachi was on the right track when he mentioned something in that area is going wrong, either whatever is there now is getting old/broken/whatever and is getting overly hot and the sensor over there is now sending bad signals to your ECU, or its the sensor itself that just sending wrong signals and throwing the ECU off. OFfcourse with the ECU making the wrong desisions your engine will not run correctly.

Probably when your engine is still cold (and thus the exhaust still cold) there is no problem yet.

But having a car myself without a cat or any sort of sensors on my exhaust I haven't got a clue how this is supposed to work so I can't comment on any way to diagnose this.. Hope one of the more technical guys wake up and give some info but I guess this thread hasn't caught their attention yet...