qldit

Good Evening Gentlemen, yes it most certainly is interesting, one point of interest is that I would have expected it to be a "closed loop" kind of config at initial start and if that were the case it would be expected to be a little towards rich but follow a pre-programmed arrangement.

The original problem onset "it started running really rough at a red light" kind of indicates to me that it was operating OK until it became stationary in that instance, coupled with the alternator being replaced shortly beforehand, (I kind of suspect that the dreaded "jumper leads" may have even had some possible involvement, as a guess) but circumstantially it has had an electrical problem of one kind or another previously, and this problem suddenly arose.

It will be interesting to see what the outcome is, the old adage applies that "you always find the problem in the last place you look"!

I am not familiar with that particular computer system but it is reminiscent of some of our Bosch systems that failed in a "limp mode" (kind of get you home mode where the injector timing is not really controlled, a ***** to start and runs rough)

I am probably wrong but it is reminiscent of an experience I had and the circumstances are very similar.

Cheers, qldit.