Re: Cold ruff start - 1994 Carmaro
What if you were to disable the ignition system and crank it?
Would it spin over good as normal?
If it does spin good & fast, I would think it would be ignition related, too far advanced initial timing, especially with it backfiring as Ruth says it does. Once the engine is running, ECM learns, adjusts operating conditions, then engine runs good for the rest of the day.
But what puzzles me is it reads like the ECM losses its learned memory overnight and has to relearn the following day, if it starts. Could it be the memory power is lost when off? Always wondered about the "limp mode" and I bet this is the program making the engine run.
This reads like the wonderful OBD 1.5 operating system. I'm open for comments.
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