Quote Originally Posted by BillBoost37 View Post
Had two cars with bad heaters in the O2's pretty close together. Sure it typically throws a code. Sometimes though, it's dead on startup...so after your 10 seconds when the ICM hands off to the pcm, the car runs horribly. Take a look at the O2 on a tool and it's sitting around 100mV and dropping. May run so badly the PCM doesn't have time before the stall to test and toss the code.

Merely saying, it does happen.
Sounds good to me.

Its not the 'ICM handing off" its basically just going near closed loop idle, as it does not try to go into any of the o2 values for a period of time.