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2013 Chevrolet Suburban
Platform: GMT 400, 800, 900

Chewing up ECMs

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Old Sep 16, 2012 | 8:27 PM
  #11  
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From: kevinkpk
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If you put the gearshift in 2nd only, does it remain the same rpm at hi rpm's?
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Old Sep 16, 2012 | 10:39 PM
  #12  
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Originally Posted by kevinkpk
If you put the gearshift in 2nd only, does it remain the same rpm at hi rpm's?
Yes I've never noticed even a blip on 2nd. Have had it screaming at times really high RPM because I was on the interstate and couldn't afford to safely go below 50 mph and has been rock solid.
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Old Sep 21, 2012 | 10:48 AM
  #13  
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Default Wiring Harness

For anyone still interested in helping me with this ......

They are now checking out the wiring harness. I was told that they discovered some loss of voltage in the wiring and were able to narrow it down to a certain section of the wiring.

They allegedly got the schematics on Wednesday and here it is Friday and they are still "working on it".

Thoughts anyone?
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Old Sep 21, 2012 | 11:07 AM
  #14  
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If it were me working on it, I'd disconnect the wires from both ends of the cps, check continuity, and to ground. I'd also put an O scope on it, with it running, and look at the sine wave, and amplitude from the cps.
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Old Apr 9, 2013 | 11:21 AM
  #15  
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Hello everyone

Well I had a very good winter with no problems at all. Our first couple warm days in Maryland and my issue seems to have reappeared almost immediately.

To recap:

- Engine Stutters ONLY in gears 3 and 4
- Absolutely no problem in Gear 1 and 2
- It has to be warm. Engine has to be warmed up and outside temp has to be 75+
- There has to be a decent load. 6+ Adults, full tank of gas, going up hills ... or any combination of those.

Anyone have any ideas at all? Please?
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