Question about GMC G2500

2 Answers

Having a lot of trouble starting truck when it is warmed up. Have recently changed the PMD & isolated it but this has not helped.

Posted by on

2 Answers

  • 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.

    President:

    An expert whose answer got voted for 500 times.

  • Master
  • 1,263 Answers

Generally when this happens it's because your eger valve is stuck open. this is your exaust gas relief . when this is stuck open your fuel air mixture is not enough to get combustion inside the cylinders. your fuel system is based on ceratin pressures and the TPS(throttle position sensor)O2(oxygensensor)fuel pressure regulator,and egr all work in conjunction through the ECM(engine control module). replacing the the egr valve will take car of the problem. it is an easy do it your self and the replacement part can be purchased at a autoparts store. please rate this...thanks

Posted on Sep 22, 2008

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    Hot-Shot:

    An expert who has answered 20 questions.

    Corporal:

    An expert that has over 10 points.

    Mayor:

    An expert whose answer got voted for 2 times.

  • Expert
  • 84 Answers

Yup thei is usually caused by the o2 sensor ..... go to an autoparts store they can check if it is in open loop or closed via the pcm
This is a common issue for 02 sensors ,,,, I love my chevys
LB

Posted on Sep 22, 2008

  • Larry Sep 22, 2008

    also the fuel regulator could be the culprit

×

Add Your Answer

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

1 Answer

Problem starting 6.5 TD engine in Hummer H1 1997 Hi, I have a H1 1997, i was changing the Injectors caps, and when the car came back it was suffering from late starting.. in the beginning it was starting...


Has the fuel pressure regulator been checked?

Check the cam position sensor and crank pposition sensor- they will test like a tansistor, because they are a hall effect transistor. I suspect one of those two sensors may be at fault.

Oct 30, 2012 | 2007 Hummer H1

1 Answer

Where is the pcm located on a 1995 ford explorer?


You won't have the ability to replace a PCM yourself

That will be a very expensive Dealer job & the next one
will have to have your info transfered over & possibly updated

For a thousand dollars, I would start diagnosing other items

You can not do anything yourself until you spend around
$400.00 for the factory work shop manuals & powertrain
control & emission manuals

Without them as reference material, you have nothing,nothing
to work with & no knowledge of the product your attempting
to diagnose & repair, if necessary.

Jul 07, 2012 | 1995 Ford Explorer

1 Answer

My truck has 70,000 miles the pmd has been relocated under the dash with a 12 volt fan blowing on it. it recently started stalling, some times it will restart soon after other times it has to sit awhile....


Very good idea to relocate the PMD. Replace it and you should be fine. It is heating up internally and even with the fan blowing cool air on it, it has already been damaged. Replace it and with this set up, you should get quite a bit of life out of the new one.

Oct 19, 2010 | 1995 Chevrolet K2500

2 Answers

Starting/stalling problem


it could be your pmd, they get to hot sitting where GM located them from the factory. check on relocating it they sell kits for it as this is a VERY common problem w/the 6.5.

Apr 04, 2010 | 1998 GMC Sierra

2 Answers

My 2002 chevy express 6.5 turbo diesel van,stalls out of the blue while driving.I have changed oil and filters to no avail.Please help.The mechanics have no clue why or what could be the problem.The...


have you check the fuel pump?or the fuel shutoff solenoid is going bad or loseing power. I also know that chevy has a problem with the fuel injection pump on the 6.5 diesel had one. the pump would go out around 50,000 mils

Feb 25, 2010 | 2000 Chevrolet 3500

1 Answer

1995 CHEVY 1500 6.5 TD NO START CRANKS OVER FINE DTC CODE #35 NEED TROUBLE TREE FOR NO START CODES


Found this online: GM Technical Service Bulletin #77-63-06Ab states that: "stalling, hard starting, and hesitation are symptoms of a failing PMD (Pump Mounted Driver) module." These symptoms usually (but not always) set a code 35 or 36 in the 1994 - 1995 models, or a code 1216 in the 1996 - up models. Often when this problem is diagnosed at a dealership or repair shop, the customer is told that the injection pump needs to be replaced. But in most cases, the PMD module can simply be replaced for a fraction of the price. ds4chevyfsd.jpgThe PMD module, (also referred to as the "Fuel Solonoid Driver") has been a major problem for Chevy / GMC 6.5L diesel owners since the introduction of the 6.5L electronically controlled DS4 fuel injection pump. It has been determined that heat is the primary cause of PMD failures. The PMD is mounted to the side of the fuel injection pump from the factory. But the injection pump does not provide adequate cooling to keep the PMD functional. Once the engine begins showing symptoms of hesitating, stalling and hard starting, the problem will only worsen with time. The problem only becomes more serious when considering the potential danger of your engine stalling in a situation such as pulling into heavy traffic or descending a steep hill and losing the use of power brakes and steering.

Hope this helps!

Nov 28, 2009 | 1995 Chevrolet K1500

3 Answers

Pmd


the stock location of the pmd is on the side of the injector pump. if you stand at the front the vehicle look and the middle front top section of the motor right where the drivers side of the intake manifold starts to rise you will see it

Nov 17, 2008 | 1995 Chevrolet K2500

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

77 people viewed this question

Ask a Question

Usually answered in minutes!

Top GMC Experts

yadayada
yadayada

Level 3 Expert

60960 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

21949 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

6812 Answers

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

Answer questions

Manuals & User Guides

Loading...