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Cold Startup question, after warmup, 90 FC3C, idle hunts, then finds!

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Old 12-19-05, 05:12 AM
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Cold Startup question, after warmup, 90 FC3C, idle hunts, then finds!

Kinda posted something similiar before, but title says it all. Startup normal, the higher rpm 16-18 second "rotary choke", then gradually comes down, then now its really starting to hunt for idle. If I let the girl continue on, after about 5-6 minutes, no more hunting, and idles consistantly around 800. After driving, come to stop sign, or light, in 1st gear same situation, then smooths out. Put in 2-5 at stop, no hunting.

Ideas? TPS ad idle is fine, BAC, thermowax, TB plates, etc , etc, all test fine. Now TPS on wot is "shot" but that shouldn't affect idle, right? All suggestions appreciated.

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Old 12-19-05, 06:32 AM
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If the TPS goes open or drops out at WOT, you might want to start looking for a replacement.
It is close to gone, but you're right - it's probably not the idle problem.

Next check the BAC connector contacts.
Then pull & clean the BAC internal valve. It gan get gummed up.
Old 12-19-05, 06:34 AM
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check grounds if you havent already. when i changed my clutch i accidentally knocked off a block to chassis ground that grounded right next to the wiper motor on the firewall and it did all kinds of weird stuff, so i wouldnt rule out a ground
Old 12-19-05, 09:21 AM
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I'll check the BAC, and give it a cleaning. I didn't attempt the clutch swap yet, but I will defintely check the grounds again. I did clean them not to long ago, but will check again. I have read several post on bad solder point on ECU, could that maybe cause this. Its really strange, cause it happens intermittently, not all the time.

PEACE THE DOG
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