I've been trying to fix this for weeks. My wife's car (L81 V6) has been stalling after it reaches it's normal PEAK temperature, when the cooling fan comes on.
It cuts out, and usually won't restart for 10+ minutes of sitting.
Sounds like no spark at all.
I've been told it's one of the following:
Dirty/clogged/bad EGR valve
Faulty Throttle Body
Dirty/clogged/bad IAC valve
Bad Crank Position Sensor
So far, I've ruled out the IAC, because I've been informed it uses the throttle plate to control idle air with the electronic throttle.
The EGR valve, going by ALL DIAGRAMS I have found online, does not exist! It sure as heck isn't where it shows it, right atop the passenger side of the motor, behind the throttle body, next to a big plastic cube with vaccuum lines in and out.
Either way, in my own head I am ruling out the throttle body and EGR - because of the way it CUTS out, and won't attempt to fire at all for a while after. It really feels electrical.
On to the CPS. My local mechanic said he read online 22 comments on stalling with this motor, and 21 of 22 were faulty CPS. Apparently they say the heat of the motor oil is causing it to go faulty at a certain temp. And that sounds like my issue. He told me to remove it AFTER it stalls out, quickly rinse with cold water, reinstall and attempt to restart. I don't really like that option, as it has restarted RIGHT after stalling before, and I don't think it will guarantee a solid answer.
How likely is this the CPS causing it? Is there anything I haven't mentioned that could be the culprit? I was originally thinking overheating going by the 'hottest temp and it stalls' theory. But I watched on my OBDII reader the temp, even at the stall point, peaked @ 204F.
Any input would be much appreciated!
Monday, July 2nd, 2012 AT 9:56 PM