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Camshaft Offset (retard)
Posted to Technical Discussion Forum on 5/2/2017 7 Replies

I know I should know this, but have never ran into this issue before. Can anyone offer a short primer on what exactly the camshaft offset (retard) signal is? I know it's supposed to be near zero over 1000 rpm, and that' always been the case, unless there's an issue. But on this vehicle it's at zero with KOEO, but when I fire it up it goes up to 1436 degrees, and stays within 3 or 4 degrees of that as I run the rpm up and down. Vehicle originally came in with a no start, which I diagnosed as a cap/rotor issue. Seems to run OK now, but I can't get past the cam retard reading. I would think that it couldn't be over 180 degree (+ or -). But 1436? Am I looking at a scan tool snafu? I tried two different scanners and got the same reading.

Gary Fetting
Technician/Manager
Mid-Thumb Automotive
Peck, Michigan, USA

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car Vehicle Data

2006 Chevrolet Silverado 1500 LS 4.3L

VIN 3GCEC14X06
Engine4.3 L
Trans4-speed Automatic (Electronic)