Quote:
Originally Posted by type954
this thread will be very important to me also to help learn about CIS. my fault is that the engine will high idle ~1400-1600 rpm when hot. i was told to suspect the warm up regulator. any comments/questions?
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What kirk says. Could be one or more of several different potential faults. You need to figure out, is it a fuel mix problem or false air problem. This means checking both your mixture (emissions levels) and fuel line pressures under different conditions. The so-called warm-up regulator, more accurately called a control pressure regulator, works (through fuel pressure control) to enrich the mixture on cold start (and on hard acceleration). Auxiliary air valve works to add extra air-flow past the throttle plate on cold start, which also causes higher idle if not shut down on warm-up. AAV can be tested with the freezer test, though it could work fine in the test but still not function properly on the car due to an electrical fault in the circuit that controls it. There are also vacuum lines contolling fuel/air switchs that can influence idle. You just need to start testing.
As for the original question, could very well be clogging in the fuel distributor, which is a major pain in the ass and/or high dollar repair (though possibly a good excuse for investing in carbs).