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scannon28

03 Silverado 2500HD low speed issues: HELP

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Hello there,

 

I am having issues with my truck. It is a 2003 silverado 2500HD 4x4 LT with a 6.0L V8 gas engine and 180,000 miles. Aftermarket components on the truck are a K&N cold air intake, Hypertech max energy power programmer, a 2.5" leveling kit, and 33" tires.

 

It started with the truck randomly stalling when switching to reverse gear when parking, and started back up no problem. This has occurred atleast 4 times and does not happen every time. Another issue that is happening is that when at stops and starting to gain speed, at around 5-10 mph, the truck stutters and has a hard time gaining torque and shifting. I have zero issues at medium to high speeds and it shifts fine but it seems to not like going between gears 1-2 it has issues. I have no lights on the dash and the temperatures are at normal ranges. I have had people suggest that it could be a fuel pump problem and also heard it could be the torque converter.

 

Has anyone had similar issues or know what they would suggest might be the problem or need more information from me please respond.

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1. remove the whole air cleaner assembly to the Throttle

2. Buy some Throttle body cleaner

3. Thoroughly Clean the throttle, do Not skip anything, the plate, etc, needs to be spotless. Some folks remove them to clean

4. re assemble and test...

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I would suggest going someplace with a more advanced computer that can read transmission codes and see what codes the TCM is generating (as generally the TCM throwing codes won't turn on the CEL).

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Brought into a trusted mechanic. Says the tranny needs a full rebuild, quoted around 2300.

 

Price sounds right but the diagnostics need another opinion - or 2 ...

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