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Senior Member
Join Date: Jun 2000
Location: N. Phoenix AZ USA
Posts: 28,977
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I would switch out another DME relay and see if it still did the same. Just because a part is new does not mean that its working correctly. Did you keep the old one as a spare? Plug it in for a bit and see what happens... takes 10 minutes.
Second thing would be cylinder head temp sensor. I understand that you can ground it out at the plug above the motor and eliminate it from the system to troubleshoot.
My 85 did the same "start once, then not start the next time" game for a long time and finally traced it back to a bad cyl head temp sensor. Make sure that your sensor is the upgraded one (two wires going to the sensor and not one) and go from there.
Joe
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2021 Subaru Legacy, 2002 Dodge Ram 2500 Cummins (the workhorse), 1992 Jaguar XJ S-3 V-12 VDP (one of only 100 examples made), 1969 Jaguar XJ (been in the family since new), 1985 911 Targa backdated to 1973 RS specs with a 3.6 shoehorned in the back, 1959 Austin Healey Sprite (former SCCA H-Prod), 1995 BMW R1100RSL, 1971 & '72 BMW R75/5 "Toaster," Ural Tourist w/sidecar, 1949 Aeronca Sedan / QB
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