Engine stalls

Tiny
BRADBALDWIN
  • MEMBER
  • 2001 GMC SIERRA
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 119,000 MILES
Truck idols good but when accelerator is applied it completely stalls. Before stalling it backfires threw the intake The transmission has recenlty been rebuilt. New catalytic converter, new plugs, new wires, new internal fuel pump, new fuel filter, EGR valve is fine. Also replaced O2 sensors and crank position sensor. It is not giving any OBD codes.I have no idea what to do next eny help is welcomed
Saturday, September 12th, 2009 AT 12:50 PM

3 Replies

Tiny
PEAR69
  • MECHANIC
  • 1,482 POSTS
A backfire up threw the intake usually means that the timing is off. Was the distributer moved?
When you replace the crank position sensor, sometimes you have to have a crank position sensor relearn proceedure done to your computer. Was this done?
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Monday, September 14th, 2009 AT 2:43 AM
Tiny
BRADBALDWIN
  • MEMBER
  • 3 POSTS
It has a coil pack and no relearn procedure was not done how do you do that? I did tell you one thing wrong is a V8 sorry. I had a brain fart and it is a 5.3l
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Tuesday, September 15th, 2009 AT 10:44 AM
Tiny
PEAR69
  • MECHANIC
  • 1,482 POSTS
Did this problem happen "all of a sudden" or did this problem happen after the transmission was replaced?

A re-learn procedure is done at the dealer. When your truck came off the assembly line most of (not all) the sensors were programmed to the computer. The way your computer sees the factory crank sensor is measured in the thousandths of an inch. If the new sensor is not in this parameter, the computer will not see this sensor properly--there for a relearn proceedure "sometimes" needs to be done. The reason a dealer must do it is because they are the only shops that have the equiptment to do it.

V8 or V6 makes no difference -IMO
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Wednesday, September 16th, 2009 AT 1:12 AM

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