2008 GMC Sierra 1500 Logo

Related Topics:

Posted on Jun 22, 2017
Answered by a Fixya Expert

Trustworthy Expert Solutions

At Fixya.com, our trusted experts are meticulously vetted and possess extensive experience in their respective fields. Backed by a community of knowledgeable professionals, our platform ensures that the solutions provided are thoroughly researched and validated.

View Our Top Experts

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

1 Answer

Steven Brandon

Level 3:

An expert who has achieved level 3 by getting 1000 points

All-Star:

An expert that got 10 achievements.

MVP:

An expert that got 5 achievements.

Master:

An expert who has achieved Level 3.

  • Master 462 Answers
  • Posted on Jun 22, 2017
Steven Brandon
Master
Level 3:

An expert who has achieved level 3 by getting 1000 points

All-Star:

An expert that got 10 achievements.

MVP:

An expert that got 5 achievements.

Master:

An expert who has achieved Level 3.

Joined: Jun 25, 2010
Answers
462
Questions
0
Helped
117855
Points
1705

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

If you need further help, reach me via phone at https://www.6ya.com/expert/steven_a67ead41eb5fc62a

5 Related Answers

Anonymous

  • 1066 Answers
  • Posted on Apr 03, 2009

SOURCE: Heavy smoke on start up

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

Ad

cy schousboe

  • 2002 Answers
  • Posted on Jun 03, 2009

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.

badealer888

Stan Cather

  • 414 Answers
  • Posted on Jun 23, 2009

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.

Anonymous

  • 3600 Answers
  • Posted on Jan 09, 2010

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

Anonymous

  • 4793 Answers
  • Posted on Mar 17, 2010

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.

Ad

Add Your Answer

×

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

0helpful
1answer

Gmc w4500. 5.2 l turbo diesel. Hard to start

Glow plugs. does it smoke a lot after starting. Can you plug yours up at night
0helpful
1answer

2003 GMC Seirra Duramax Deisel won't start

If it cranks and won't start then it is probably your glow plug system which is used to help with starting as diesel engines have no plugs and rely on compression. It also helps to run a lighter oil in the winter so it will crank faster. You can ohm out the plugs to see if they are broken. I am not sure of the wiring on the GMC but usually diesels have several wired in parallel
0helpful
1answer

I have a 1994 GMC 3500 diesel that i had running perfect yesturday and now it wont start. i put a new gas peddle init and still nothing

HI" is your glow plug light coming on for a moment and going off ,,cause you may have a problem glow plugs or relay ,have you scan computer for codes
0helpful
1answer

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.
0helpful
1answer

Heavy smoke on start up

sounds more like a worn turbocharger with bad seals.  Sadly this will be expensive.  Remanufactured turbos are available.  
5helpful
1answer

My 98 gmc 6.5 diesel runs good then dies and won't start back.

there is a injector driver module relocation kit with a heat sink to mount it to because the module in the orgional location the module would overheat. also check the glow plugs the quick easy way to do this without removing them is to unplug all the glow plugs then hook a jumper wire up to battery positive and and touch it to each glow plug there should be a spark and if there isn't then the glow plug is bad.
6helpful
1answer

1994 GMC Sierra 1500 6.5 diesel runs for awhile then stalls

check your pmd switch. i had mine changed and it runs great. the problem is that it gets too hot and burns it up. be sure to move the pmd swith on the firewall away from the injection pump.
0helpful
1answer

Turbo lag and lack of power

Hi,
This is the second Vw I have responded to in a fortnight.
Your lack of power I presume always happens when the glow plug light illuminates?
This is because it is causing over combustion to vaporised diesel, I would be looking in the Glow plug timer and relay, as for Turbo lag, I run a E34 6 cyl Bmw Diesel and the Turbo only kicks in around 2,500ish so maybe yours is a little tired or in need of a check up?
Hope this helped,
Paul 'W'
Onyer~EDson(:0) {#><U.K.
Please remember to rate my effort!

6helpful
2answers

Truck just shuts off

I own the same 3500 GMC 6.5 diesel truck with the same problem. We replaced the brain under the upper turbo hood and it fixed it pronto. No more shutoffs
6helpful
2answers
Not finding what you are looking for?

331 views

Ask a Question

Usually answered in minutes!

Top GMC Experts

ZJ Limited
ZJ Limited

Level 3 Expert

17989 Answers

john h

Level 3 Expert

29494 Answers

Thomas Perkins
Thomas Perkins

Level 3 Expert

15088 Answers

Are you a GMC Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...