Question about Chevrolet Silverado 2500

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2003 chevrolet 2500 HD extended cab four wheel drive

I have had the throttle body replaced the crank sensor replaced fuel pump and fuel filter and lock ring replaced and plugs and wires ignition switch replaced...the trucks rpms drop way down to about 500rpms at 60 70 mph and when stopped rpms are way below 0...the first time this happened the truck shut down about 25 miles later prior to that all the power was there i bumped the bottom of fuel tank started but not for long. thats when i had the fuel pump and fuel filter replaced...everything was fine then and now the rpms are dropping real low the same way as it did before...please help me figure out what the problem may be...thank you...

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  • Contributor
  • 20 Answers

Had a 1999 suburban do the same thing the new pump came complete with sending unit and a new end plug the connecters are bad about getting moister in them at the top of pump and corroding did you change the plug part stores should sell these if you did not get one i found this out after changing my pump 3 times same thing also found cheap pumps the wiring going through the pump plastic at plug is very small and gets hot and melts when it cools it shrinks back and makes connection runs for a while then stops

Posted on Dec 29, 2013

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Posted on Jan 02, 2017

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SOURCE: Chevrolet 2500 Not Running, May Be Fuel Filter Sensor

That red wire is only for the fuel heater.will not cause a no start.try pumping the primer pump on top of the fuel flter hsg. but first open the bleed screw,which is black plastic also located on the top.this will eliminate any trapped air that might have entered the fuel intake system.if the pump does not get firmer and harder to push, then you have a leak in the fuel supply lines or the ck valves in the fuel filter hsg or stuck open. Still no start have it scanned to ck fuel pressure while cranking.it should be close to 5000 lbs

Posted on May 14, 2008

  • 20 Answers

SOURCE: Have a 1997 Dodge ram Laramie SLT quad cab 2500

check fuel filter and air filter

Posted on Sep 03, 2009

  • 306 Answers

SOURCE: 1995 nissan pickup truck fuel problem

Fuel injected or carb? Make sure fuel line itself is clear. Some pumps are designed to self regulate (carb systems) some continually pump and a psi regulator sends back the excess fuel back to the tank (fuel inj systems) If the line is obstructed then pump can't deliver fuel fulltime.

If you think pump is not on consistent, try running a dedicated wire through a switch directly to the pump. If it works then you are looking for an electrical fault going to pump. Good luck.

Posted on Mar 10, 2010

  • 242 Answers

SOURCE: 1986 toyota truck 4x4, 4cyl,

The igniter interprets signals of time and position from the distributor, fits the efi ecu with information and then the ecu gets back to igniter to tell it when to fire specific cylinder, we used to have problems with the distributors and also igniters.

Posted on Jan 11, 2011

SOURCE: 98 Chevrolet Silverado runs rough at half throttle and past.

try removing the EGR valve and clean inside of it and manifold

Posted on Feb 17, 2011

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Chevrolet 2500 Not Running, May Be Fuel Filter Sensor


That red wire is only for the fuel heater.will not cause a no start.try pumping the primer pump on top of the fuel flter hsg. but first open the bleed screw,which is black plastic also located on the top.this will eliminate any trapped air that might have entered the fuel intake system.if the pump does not get firmer and harder to push, then you have a leak in the fuel supply lines or the ck valves in the fuel filter hsg or stuck open. Still no start have it scanned to ck fuel pressure while cranking.it should be close to 5000 lbs

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