Vac Hose Job Complete! New Problem...
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'86 Can-Am
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Vac Hose Job Complete! New Problem...
Just fired up my '93 after tackling the vac hoses....have 2 issues. Surging at idle (1700-2000), and while testing heater for coolant circulation, as soon as I turn the fan on high the rev's jump to 2500. Fan off-2000, fan on 2500. Any guesses as to what I've done? The car starts cold and runs smooth at 2000 for about one minute, then starts the hunting/surging thing.
Thanks,
Seann
Thanks,
Seann
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RE-RE-checking tonight.....vacuum related hunting idle makes sense, but never heard of a heater fan switch controlling rpm????????? Especially 500 rev's! That's the real head scratcher, any ideas?
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I don't know anything about the stock ECU, but with the power fc ecu, electrical loads will increase the idle... the default setting is I think somewhere around 1000rpms for an electrical load with no ac. (normally, you bump up the idle only 100rpms for an electrical load from base setting, and 200 rpms for ac + electrical load from base settings)
I'm assuming the stock ECU does something similar to this, maybe with a vacuum leak this bump in idle is exaggerated.
I'm assuming the stock ECU does something similar to this, maybe with a vacuum leak this bump in idle is exaggerated.
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