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there is an idle up solenoid on the the carburetor. adjust the idle speed at 800-900rpm. RPM up and down is due to a/c compressor engaging. if the rpm drops too low, a/c compressor disengages. observe your idle speed with engine warmed up, turn on airconditioner and adjust the idle compensating vacuum diaphragm adjustng screw underneath the carburetor to the same rpm when a/c was off. that should correct your rpm problem
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Jan 29, 2010 - Uploaded by stikkyp
My 1994 Honda Civic SI has an erratic idle. It stays at 3000-3500rpm when started cold till it warms up then ...
Hi Bobby i had a 2004 caviler did the same thing the code that came up was idle air control valve but after replaceing it i got the same code with check engine light on. And idle going up and down with high idle! turns out the brake power booster had holes in it on the back side of it the side that faces the firewall. The best way to check is to pull off the vacume line that goes to the brake booster and put your thumb over it and see if the idle goes down! If it does that,s your problem. also check all vacum lines! Hope this helps you out... Ed
Check idle air control system. The system comprises a valve that allow extra air into the engine when the engine is idle. If the valve is stuck, if there is a problem with IAC wiring or solenoid or if the vacuum hose connected to the IAC has a leak you get engine running rough and turning off when idle.
Check air intake and sensor (MAF and AIT). Replace air filter. Air intake problems may result in rich mixture and in engine turning off.
Check EGR and PCV valves. These parts may cause rough idle. When the problem is EGR or PCV you usually get troubles also when driving.
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