MAFoElffen
New Member
- Joined
- Feb 6, 2010
- Messages
- 11
- Reaction score
- 0
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- Vehicle Year
- 1993
- Make / Model
- Ford
- Transmission
- Manual
Is the static position of the IAC valve normally closed or open? (Can't find this answer in thread search here)
Wondering if I should build a blockoff plate to test a problem I'm having (another thread).
Edit: Never mind found it in the Chilton "Engine Code Manual." Normal is closed. Test voltage when cold should be near battery voltage. Signal is pulsed at 140 for full-open. AFter warmup, 0 volts, 0 pulses. Dependant through the PCM on Info from the Coolant Temperature Sensor, Intake Air Temperature Sensor and the Throttle Position Sensor. Terminals should have resistance betwen them and not be internally grounded to case.
But other noted problems to check before suspecting an IAC were faulty PVC Valve or vacuum leaks. Since these seem to be fine in my case, I made a blank gasket to block it off, installed it after "warmup" to test my situation...
Wondering if I should build a blockoff plate to test a problem I'm having (another thread).
Edit: Never mind found it in the Chilton "Engine Code Manual." Normal is closed. Test voltage when cold should be near battery voltage. Signal is pulsed at 140 for full-open. AFter warmup, 0 volts, 0 pulses. Dependant through the PCM on Info from the Coolant Temperature Sensor, Intake Air Temperature Sensor and the Throttle Position Sensor. Terminals should have resistance betwen them and not be internally grounded to case.
But other noted problems to check before suspecting an IAC were faulty PVC Valve or vacuum leaks. Since these seem to be fine in my case, I made a blank gasket to block it off, installed it after "warmup" to test my situation...
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