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Super Moderator
1966 Crown Coupe, 2016 200 S AWD, 1962 Lark Daytona V8.
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24,485 Posts
I believe that by rolling the key to 'run' will retract the pintle for an idle speed 'flare' at start up. Have a helper roll the key to on and then unplug the IAC. This should leave it in the retracted position.
 

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Super Moderator
1966 Crown Coupe, 2016 200 S AWD, 1962 Lark Daytona V8.
Joined
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24,485 Posts
If an injector leaks down after shutting off the engine, it can cause a hard, rich restart. On a warm engine the fuel can vaporize and affect all 6 cylinders on a restart (multiple cylinder misfire). By holding the gas pedal down helps to clear a rich, flooded condition with added air and ease starting.
The IAC is basically for idle and lower engine speed regulation. It also opens on deceleration for emissions control and stall prevention, like an electronic dashpot.
The correct spark plug should be RN14PMP5. Other brands may not match the correct heat range and carbon foul easily. Aftermarket O2 sensors may also cause issues. It is always best to use OEM parts.
A fault code check by counting the 'ck eng' light flashes will always start with 12 and end with 55.
 
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