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Discussion Starter #1
well after years of never being surprised i am now i have a 01 325i in the shop throwing codes p1636, p1503, p1507
basicly the car will only start if the iac valve is unplugged yep u read that right it will only fire up with the iac unlpugged
i have replaced the iac the throttle body the disa valve and maf twice 1st time with new parts sencond time with junkyard parts
im stumped unless its a broken wire somewhere any how anyone have experiance with this issue? or is it a lemon law car:excited:
 

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2004 330Ci 85k miles
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12,823 Posts
P1636: Engine Failsafe Program
P1503: Idle Speed Control Valve Closing Solenoid Control Circuit Signal Low
P1507: Idle Speed Control Valve Open Solenoid Control Circuit Signal Low

I would first carefully check the wiring between the ICV and DME.
 
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