Question about Cars & Trucks
Code p0507 refers to idle sped control (ISC) system--rpm higher than expected==causes --wiring--isc actuator--iac valve--throttle motor--throtle valve tight/sticking--ECM
it also refers to idle air control (IAC) system --circuit low==causes--wiring short to ground--IAC valve--ECM
Posted on Nov 12, 2014
Do throttle relearn procedure.
Posted on Jan 30, 2015
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Posted on Jan 02, 2017
A p0420 code indicates a Catalytic System efficiency failure, Bank 1.
Basically, the computer is seeing reduced efficiency of the catalytic converter or one of it's components (such as an 02 sensor)
There may be a few root causes, such as a faulty oxygen sensor, faulty coolant temperature sensor, faulty converter, Large exhaust leak, or retarded (slow) timing.
Posted on Nov 30, 2009
Ignore me if I am wrong, but I believe the timing is ECU defined and non-adjustable. To confirm, it has a crank position sensor.
Posted on May 25, 2010
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