Question about 1994 Hyundai Excel
Hyundai Excel fails to increase idle speed when aircon (or even rad cooing fans) invoked, but idle control valve does work.
Hmmmmmm.... seems to me you have a completely different problem since you've verified the idle control valve is working. What controls the idle control valve?... AH!... the ECU!... is the wiring between the ECU and the Idle Control Valve in good condition and making good connections? mmmmmmmmm... then I'd say you have a defective computer (ECU). Here's something you might try. Disconnect the battery connection cables from the battery... touch them together (cables + & -) for thirty seconds. Reconnect the cables to the battery and see what happens. Sometimes there's 'GARBAGE' stored in the ECU memory and interferes with the normal operation of components. If nothing changes, you'll need to start testing (bench testing) components (idle speed control actuator (make sure it's not 'sticking'). check for vacuum leaks.... thoroughly inspect intake air hoses & vacuum hoses... inspect all EMS (Engine Management System) connectors for any signs of corrosion or mal-connections (male & female pins). The problem may simply be electrical contacts/connections.. .then again, it could be mechanical.
Posted on Jun 26, 2009
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Posted on Jan 02, 2017
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