1994 Honda Civic Repair Question
Asked on November 10, 2012
Honda Civic Body Problem
I have a 1994 hond civic ex v tec 1.6L an has a problem with the iac valve or just has an idle problem i unplug the iac an it still idles high i dont know what else to do maybe it has a vacum leak
Asked by (pending member)Answer
Replied on November 14, 2012
Remove the air cleaner hose. Start engine and cover the ports inside the throttle body. If the upper one reduces the idling speed, the IAC is the problem.
If covering the lower port lowers the idling, the cold start (Fast Idle Thermal Valve) is faulty. Check the coolant hoses for clogging. The FITV plastic valve could have worked itself loose due to a bad/hardened O ring allowing excessive air into the manifold and increasing the idling speed.
