'82 Spider - car can't get above idle. Nearing my diagnostic wits end. - Page 3 - Alfa Romeo Bulletin Board & Forums
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post #31 of 33 (permalink) Old 06-28-2019, 11:31 AM
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Can you see a difference in the appearance of #3 and #4 plugs immediately after the no rev condition?

Ed Prytherch
79 Spider
76 Suzuki GT500
2011 Jaguar XKR

A little government and a little luck are necessary in life, but only a fool trusts either of them. - P.J. O'Rourke
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post #32 of 33 (permalink) Old 06-29-2019, 05:08 PM
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If you have same problem with new ign system then wouldn't voltage drop be considered- all voltage runs thru ignition switch known to have problems - that's why they came ip with headlight relay bypass setup - had one switch go bad and hard time figuring out what was wrong- had running problems before it quit completely- guess contacts in switch burn cutting voltage - just an idea to check
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post #33 of 33 (permalink) Old 06-30-2019, 06:14 AM
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These are 101 things and you are well into the 401 things, but from your OP it sounds like the car ran fine one day but not the next morning. It also reads like you were away and it was not parked in your garage that night. What else could happen overnight? Not sure where it was parked, but did a mouse build a nest in your intake to the air cleaner box? Did an animal chew through some wire insulation somewhere? Could a vandal have poured something into the gas tank?

Other 101 things: Ensuring your throttle linkage has full motion and that one of your throttle rod ends did not snap apart, and ensure your VVT solenoid isn't stuck.

Not a 101 item and not likely to happen overnight, but maybe a compression/leakdown test and/or visual inspection of the valve train might reveal something.
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