2005 GMC Sierra ECM - PTCM

Tiny
TOMPV356
  • MEMBER
  • 2005 GMC SIERRA
  • V8
  • 4WD
  • AUTOMATIC
  • 66,000 MILES
2005 GMC 2500HD Duramax. Have had injectors replaced and a new PTCM installed less than 5000 miles ago. Started heavy smoke. From the day the PTCM was installed mileage dropped 2-3 mpg. It started smoking heavy so took it in. All injectors were fouled as well as EGR, & turbo boost sensor, they cleaned and seems to run OK. Thing is that, I am sure that did not fix the problem. The injectors did not have 1000 miles on them when the PTCM was replaced. They do not want to replace the PTCM again. They say the injectors looked like they had 250000 miles on them, truck only has 66000. They have reflashed the ECM. Can I get a new PTCM & get it properly programed? I am told by several GM techs the PTCM can not be checked for proper function. I do feel the PTCM is the problem, it was junk when they put it in. My reasoning. 3 power steering pumps to get a good one, 19 injectors to get 8 that seem to balance OK. Their reman stuff is very low quality. Any info/advice would be appreciated
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Friday, August 7th, 2009 AT 5:00 PM

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Tiny
BRIAN 1
  • EXPERT
If it has a high soot level, I would take a fuel sample and check for contamination or water, this will cause high soot levels and I would check the injector balance rates, I would also clean the fuel system, after that I would fill the fuel tank and add a fuel conditioner. Only alcohol free water demulsifiers should be used in General Motors diesel engines. The GM Diesel Fuel Conditioner , The Racor Power Shot Plus , and the Stanadyne diesel fuel additives are alcohol free and utilize water demulsifiers to cope with water in the fuel.I would only do this after the fuel sys is cleaned, and check for any dtc's.
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Friday, August 7th, 2009 AT 6:06 PM
Tiny
TOMPV356
  • MEMBER
Thank you for your response. The fuel system has been cleaned. But they did mention high soot. In fact they want me to switch oil. I run Amsoil 15-40, switched when the rig had about 19000 miles. They say go back to Chevron Delo or Mobil 1. They also said to go with the new CJ-4 type oil, rather than the recommended CI-4. I have used Stanadyne with almost every tank since they went to the ultra low sulfer diesel, just mix according to how many gallons I put in, don't over do it I'm sure, not that that should cause a problem. With 66000 miles I have only added maybe 5 qts of oil and change when the computer says I am at between 35 & 40%.

Thanks again for your response and input
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Friday, August 7th, 2009 AT 7:48 PM

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