P1504= Idle air control circuit malfunction
Trouble code P1504 means: Idle air control (IAC) circuit malfunction
Trouble code P1504 means: Idle air control (IAC) circuit malfunction
Trouble code P1504 means: Idle air control (IAC) circuit malfunction Trouble code P1507 means: Idle air control (IAC) underspeed error
According to my Chilton repair manual : P1504 - idle air control (IAC) valve and / or circuit fault
Trouble code P1504 means: Idle air control (IAC) circuit malfunction
Yes, mikuni 42s commony rattle at idle on evos- not a deal-breaker- it's nothing.
IF ITS JUST AT IDLE, CHECK YOUR IDLE AIR CONTROL VALVE IF IT HAS ONE.
Something loose? Exhaust pipe rattling/hitting on something? You'll have search it out.
p1506 is an IAC (Idle Air Control) error code that comes on when your on-board computer senses an undesired Idle RPM.
That code is an idle air control overspeed error. It means that the engine idle is out of factory specification. Sometimes the Idle Air Control may have carbon built up so clean it and if that does not fix it, replace it.
The IAC the Idle Control Valve, this controls the mixture between fuel and air for the idle of your vehicle.
1990 gmc p/u 5.7 wont idle showing code 12