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On 30 Jul 2001, at 10:07, Shirley, James J CDR (CNSP N4341) wrote: > In what situation would you use this temp sensor? In the next few days > I am going to make a trip back to the wrecking yard to double check > the ECU part number, my eyes aren't what they used to be. Asking > around locally the popular opinion seams to be that the ECU > potentiometer was only (not all) on cars built for sale in California. > The smog requirements were stricter than strict and still are. Would > the T-4 ECU work in a T-3, it looks like all of the parts are the > same? There certainly were differences in the FI systems delivered to CA, but the brains and temp sensors were the same. I think the main difference is that CA got EGR on some cars that 49 state cars did not. While a type 4 brain might work with a type 3 system, I would not expect it to work well, or properly. I suspect that doing this just to get the pot would be a losing battle. Is there some reason that you think you want a brain with the pot on it? - Jim Adney jadney@vwtype3.org Madison, WI 53711-3054 USA ------------------------------------------------------------------- List info at http://www.vwtype3.org/list or mailto:help@vwtype3.org