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Too bad that changing the head sensor had no affect on the fix but you have some more future insurance now from other weird breakdowns, I had this problem too before. Yeah I think it is a good idea to look at your pressure sensor, I forgot how to test it, the troubleshooting of this unit is probably in the Bently manual. The pressure sensor is somewhat like a varible transformer and the internal winding may short or open. Check manual for resistance readings. This pressure sensor failed me twice in the past because I used old junkyard parts that were at the end of life. The internal diaphram tends to crack after thirty years of use. Sometimes the round plate diaphram cracks (most common, many autotopsis in junkyards), this problem can be diagnosed by sucking or placing vacume on vacume inlet and observing how much leakage occurs, should not leak; or the barometric bellow diaphram may be cracked, this later problem is not as common but age will make it common, you cannot diagnose this easily, you must open and check (if screws were installed); in any event the pressure sensor must be replaced by a new expensive Bosch unit or a cheaper unit from Brent Instruments. I have had much pains and headaches because of this, just like you. I have have nearly every type of EFI problem before. Good luck. LEON MARTINEZ martinezl@ftscpac.navy.mil 1969 SQUAREBACK EFI/AUTO SAN DIEGO AND TIJUANA ------------------------------------------------------------------- Too much? Digest! mailto:type3-d-request@vwtype3.org Subj=subscribe