Author Topic: GM Specific Camshaft Retard Offset  (Read 13508 times)

Offline jhs24

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GM Specific Camshaft Retard Offset
« on: November 01, 2014, 12:02:46 PM »

There is a GM specific value called "Camshaft Retard Offset". It is a value which is supposed to be between -2 degrees and +2 degrees when the engine is at 1100 RPM. This applies to L31 chevy GM vortec engines (350 V8) between 1996 and 2002. Some scanners call it CMP offset (GM Tech II) or Knock Retard (Launch Scanners).

Is this a PID which this tool can read as live data?
Again, this is not a regular OBDII PID and it's GM specific.

If so, you need to advertise it because there are many home mechanics who would rather buy a scanner than pay $60 for a shop to do it with their full sized professional scanner.

Looking forward to the reply.

Offline UltraGauge Admin

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Re: GM Specific Camshaft Retard Offset
« Reply #1 on: December 08, 2014, 10:22:21 PM »
The MX can access manufacturer specific parameters, but only if you know the codes for the parameter for your specific year, make, model and engine size.    Manufacturers don't make codes public.  But there is always some die hard user that goes through the effort of reverse engineering the codes.   The best place to find such codes is on a forum specific to your vehicle.