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Okay, See If the TechMasters Can Solve This

TxDoc

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TxDoc Senior Enthusiast

TxDoc

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1997 GMC, 350, 4x4, InstaTrac.

 

Shift into 4WD. Start to drive (on snow covered road). Hit first shift point and get a sudden very bad "dieseling", jerking, studding and shuddering. Lights flicker and after it finally shifts, maybe 4-6 seconds, smooths out. Does it at the next shift point, too.  Threw a code. Light went off two days later. Dealer said they cannot find anything. They can't get it to do it, but I can. When I demonstrated, they just said, "that is strange".  Something electrical, electronic and/or something that occurs when the tranny wants to shift.

 

I wish I could award a prize to anyone who solves it. I kinda need my 4WD to work. We have about 7 inches of snow and now sleet on the ground. ;) Not good in Texas.

TxDoc Senior Enthusiast

TxDoc

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It has done this for three years, now.  The tranny was rebulit about 6-7 months ago and it feels the same as before.  Is the torque management thing a module or something that can just be replaced?  If it is that, why would it do it only when in 4WD?  

 

On the PCM. How do you reset it?

CMNTMXR81 Senior Enthusiast

CMNTMXR81

Posted
Posted

The "torque management" is part of the PCM's programming.  There is nothing you can do externally to it.  It'll need to be "re-flashed" at the dealer.  There could be a TSB out for something like this.

 

In order to reset your PCM, go to www.autotap.com and they give a thurough procedure for doing this as their are actually a couple of different way for various GM vehicles to reset it.

 

As to the transmission, it would most likely be in the torque converter if anything.  I can't think of anything in the valve body that would cause this symptom.  It may be worth having them hook the TechII up and looking at the Torque Converter Clutch slip speed (TCC slip speed) on it.  It could well be trying to lockup way sooner than it need be, anotherwards "tight".

TxDoc Senior Enthusiast

TxDoc

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Thanks a bunch. I will print out the suggestions and see what they can do.

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