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We need to make sure to not overthink this.
First thing for the 3.2: *always* keep a spare DME relay. I don't believe I've ever read a thread on how to "test" this relay. Whenever the 3.2 has a starting issue, we replace the relay. If the starting issue continues, then we move on to the basic analysis: fuel and spark.
Fuel: I prefer to introduce ether or carb cleaner to the intake. If the car immediately starts for a second or two then dies, then your car is starved for fuel and your work starts there.
Spark: I prefer to pull a plug and wire, and use a jumper wire from the base of the plug to a good ground on the engine (away from any fuel supply). Having a friend turn the key, I observe the spark. No spark? Then follow Ingo's instructions by the letter.
My guess is that you have a bad reference sensor. Just my .02 cents, FWIW
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STONE
'88 Cabriolet, using EP Slick 20w50 partial synthetic Snake Oil...just as Rommel intended.
Deny Everything; Admit Nothing; and Always Make Counter-accusations
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