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kklonghorns 03-11-2010, 07:17 PM My buddy has an 8.1 that will at random times just stop running. If ya turn the key off for a few seconds it will restart and run fine. They had it at a mechanic and he had a computer on it and found nothing. Any help would be great. Thanks Tanc Crusher 03-11-2010, 07:34 PM Possible the CPS Crank Position Sensor. They are common to go bad on the 8.1 vortec. That would be my thoughts. Brian Ender06 03-11-2010, 10:25 PM Possible the CPS Crank Position Sensor. They are common to go bad on the 8.1 vortec. That would be my thoughts. Brian EACTLY what he said! shooter_va 03-12-2010, 05:35 AM Sounds like the CPS, mine had the same symptoms and no code. kklonghorns 03-12-2010, 11:08 AM Thanks guys 83trekker 03-12-2010, 11:50 AM My truck is on its third cps and its only got a 114k KM not miles. DURAtotheMAX 03-12-2010, 11:53 AM sorry guys...minor silly thing but just a pet peeve of mine... CPS = CAM shaft position sensor CKP = CRANK shaft position sensor :d ;) Ben Tanc Crusher 03-12-2010, 06:43 PM sorry guys...minor silly thing but just a pet peeve of mine... CPS = CAM shaft position sensor CKP = CRANK shaft position sensor :d ;) Ben Have to agree on the CKP but for the Cam was it not CMP? But I could be wrong too. I just use CPS since it seems so common on many other forums but will use CKP from now on. Brian | ||