Have to feather the throttle for 5-10 minutes or it will stall.
For the next 20 minutes, idle will be high, around 1000-12000 rpm.
Once up to operating temp, idle holds steady at 700 rpm.
There are no bad codes.
ACT & ECT sensors are new.
IAB has been cleaned numerous times. It was removed & connected to battery with test leads; it functions when voltage is applied. You can blow through partially when no voltage & fully when 12V applied.
1. Could a partially blocked catalytic converter cause this? Whan it's cold, it doesn't flow fully; when it's hot flow is restored.
2. Or does it have something to do with open loop vs. closed loop? Won't idle right in open loop, will idle corectly in closed loop.
For the next 20 minutes, idle will be high, around 1000-12000 rpm.
Once up to operating temp, idle holds steady at 700 rpm.
There are no bad codes.
ACT & ECT sensors are new.
IAB has been cleaned numerous times. It was removed & connected to battery with test leads; it functions when voltage is applied. You can blow through partially when no voltage & fully when 12V applied.
1. Could a partially blocked catalytic converter cause this? Whan it's cold, it doesn't flow fully; when it's hot flow is restored.
2. Or does it have something to do with open loop vs. closed loop? Won't idle right in open loop, will idle corectly in closed loop.