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"Now to the CPR, some time ago I measured the resistance and got a reading. Now 0 ohms!"
Are you sure it's now Zero Ohms (no resistance at all), rather than Infinite resistance?
No resistance would be a "short circuit" and should cause fuse 7 (maybe fuse 6 on your '89?) to blow. More likely would be an "open" circuit (no continuity when reading across the CPR contacts). I believe you could replace the heater element and connector plug from a used spare, if you could get one. (And yes, there will be residual fuel pressure at both CPR lines.)
As you know from past threads, the heater's purpose is merely to hasten the transition from Richer cold running to Leaner warm running. And I'm not sure how that might affect idle speed.
Intuitively I feel that idle speed is more a function of Air rather than Mixture. Especially the small mixture variations relative to CPR temperature in a warm climate like Malaysia's. But that's just a guess. Actually, I'd expect a good AAV to give 900 rpms Cold, then reduce speed to 700 rpms Warm -- or similar, based on the idle speed specifications for your B230E.
Personally, given your "service environmemnt", I wouldn't risk the effort and potential problems of a CPR transplant in a gamble to fix a slow (and reversed?) idle speed transition, without first investigating other possibilities.
Hopefully this post will catch the attention of others with more recent experience.
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Bruce Young
'93 940-NA (current) — 240s (one V8) — 140s — 122s — since '63.
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