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On 21 May 2002, at 20:38, Keith Park wrote: > Ya know... what WAS the difference between the 028 and 048 control units?? > calibration? im running 048 but I found I have an 028 under the seat as a > spare... anyone ever done a swapout eather way? The 028 was used in 72 with the vacuum advance/retard. The manuals state that this advance/retard was no longer necessary in 73 due to changes in the ECU, when the 048 was introduced. I assumed that was the difference. Exactly what the difference is I really don't know. - ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ------------------------------------------------------------------- List info at http://www.vwtype3.org/list or mailto:help@vwtype3.org