Question about 2008 GMC Sierra 1500

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I have a 1994 GMC Sierra 6.5 turbo diesel and sometimes won't start or when running a at any speed will stop. I have changed the glow plug selenoide and the glow plugs and still got the problem. is normal that the glow plug fuse is on negative all the time (both prones) or are they suppose to be one positive and when you insert the fuse make the current flow? cause mine the fuse don't show positive power but negative on both prones. Thank you

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  • 426 Answers

First off the glow plugs are not the problem. Diesel's run purely off of compression. The basic principle behind them is compress the gas and and it will "spontaneously" ignite as long an the cylinder is hot. All glow plugs do is provide the initial heat that is needed. Once it is started they shut off. If you turn your engine off for a little while and then crank it back up, the glow plugs won't come back on as long as the engine is still warm. So now onto the actual problem. You have a FSD (Fuel Supply Driver) also known as a PMD (Pump Mounted Driver) that is failing. It tells the fuel injection pump when and where to deliver fuel. When they start going bad you will notice hestitation, to random stalls (usually when hot) to no-start situations. There is a forum I found which goes into much greater detail about it and how to fix it and help prevent it from happening again. CHeck it out. 6 5 NEWBIES START HERE
And here is a relocation harness kit made by Dorman:
Amazon com Dorman 904 113 PMD Relocation Kit Automotive

Posted on Jun 22, 2017

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6ya6ya
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Posted on Jan 02, 2017

landsend
  • 1066 Answers

SOURCE: Heavy smoke on start up

sounds more like a worn turbocharger with bad seals.  Sadly this will be expensive.  Remanufactured turbos are available.  

Posted on Apr 03, 2009

  • 2002 Answers

SOURCE: The glow plug system does not operate when you turn the key on

Go to your local auto parts store and look for a book, Haynes Diesel Engine Repair Manual, Part number 10330. It has your wiring diagram and a lot more. I got mine at Canadian Tire.

Posted on Jun 03, 2009

badealer888
  • 414 Answers

SOURCE: can a glow plug wiring harness from a 1982 gmc witha 6.2 diesel be used on a 1998 gmc sierra with a 6.2 diesel

As long as there is not damaged areas, and all connections are the same. Should work.

Posted on Jun 23, 2009

  • 3600 Answers

SOURCE: i have a 2003 gmc sierra duramax diesel and im in

The diagram is simple each glow plug is connected in a series circuit like this -0-0-0-0-0-0-0 that's a in-line 6 for a V-8 it would look like this
[-0-0-0-0
[-0-0-0-0
and the plugs would be hooked up on the back then if you follow the wire to the glow plug relay you will find that the relay has four wires one to battery one to the glow plugs one to the ignition switch and one to ground in the box. If you want you can purchase a manual for 5.99 on-line. and it covers the three fuse-able links for this system and the new Glow plugs available for this truck here is the web page. http://www.wiring-diagram.com/?gclid=CMuAvJ3Ql58CFQZfagod0jpAxQ

Posted on Jan 09, 2010

  • 4793 Answers

SOURCE: Excessive black exhaust on 2003 GMC Sierra Duramax Diesel.

This is what i would try (cheapest first) redexe/wyyns
injector cleaner,double dose,then i have put 1gal gas in 10gal diesel to increase burn temp (you may encounter a hot start problem temporarilly)then if still smoking, get a compresion check on the engine(this will tell you volumes)
by the way the NATO tanks put in 1/3 gas in diesel to stop it freezing in arctic conditions.any more than 1/3 can result in problems.

Posted on Mar 17, 2010

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Your lack of power I presume always happens when the glow plug light illuminates?
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Please remember to rate my effort!

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