stalling problems (Full Version)

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stalling problems

  

aldav123 -> stalling problems (3/20/2008 4:51:41 PM)

my h1 has been stalling as i'm driving down the road.it will sometimes start if you put it in neutral but lateley i have to come to a complete stop to restart any suggestions?

  
Injunfarian -> RE: stalling problems (3/21/2008 11:29:08 AM)

sounds like the beginning to the oh so common PMD overheating issues but not 100% sure. Does it give you problems when trying to start it back up with a hot engine?

hnymlk -> RE: stalling problems (3/25/2008 1:27:42 PM)

Sounds like the same problem I'm having. What is a PMD? (pardon my ignorance). I've replaced the fuel lift pump and a mechanic says it might? be the injector pump.  Was there a silent recall on this problem?

2001 H1 31,000 miles

Injunfarian -> RE: stalling problems (3/25/2008 2:16:27 PM)

PMD is the pump mounted driver, it basically is the computer for your injection pump. And no worries about not knowing.. I knew nothing about it either when I first bought my hummer.
And yea your mechanic would be right if thats the problem. but instead of replacing the whole injector pump(which cost me over $4500 CDN at the stealership) you can replace just the PMD and even get the relocation kit as well for under $1000 all together.(not sure since i havent priced a PMD by itself yet.)  Also save alot of $$$ on labour as well since PMD is a easy item to replace compared to the injector pump.

h1sp -> RE: stalling problems (3/25/2008 3:40:59 PM)

http://flashoffroad.com/Diesel/injectionpump/fsd.htm

This will help alot

3hummers -> RE: stalling problems (3/25/2008 7:12:27 PM)

The PMD runs about $550.00 by itself from the dealer.

hnymlk -> RE: stalling problems (3/26/2008 3:28:13 AM)

Thanks for all the great info... my hummer will go days without a problem and then it's back again.  It used to happen when hot at first but now the trouble is when I first start driving so the engine is cool; perhaps the damage is already done to the PMD?

3hummers -> RE: stalling problems (3/26/2008 6:40:51 AM)

Odds are it is the PMD. Once they start going bad it is only a matter of time. Have a tech check it to be sure and if that is it make sure the new PMD is mounted remotely so this doesn't occur again.

Injunfarian -> RE: stalling problems (3/26/2008 7:51:44 AM)

yea PMD acts like that first it starts every now and then and it progressivly gets bad atleast that was my case.

hnymlk -> RE: stalling problems (3/26/2008 8:59:09 AM)

I'm sold!  I'm off to the parts store this afternoon to get everything.  They have it all in stock and with any luck we'll be driving it tomorrow and file my test report[8|]  Thanks again for all your input...looks like I got a new place on the web to hang out.

3hummers -> RE: stalling problems (3/26/2008 2:44:14 PM)

Be sure to post the results. Good luck.

hnymlk -> RE: stalling problems (3/28/2008 5:28:05 AM)

Hi all, Got all the parts but how the **#*# do you get the old connector off the PMD while it's in place.  I can get a screwdriver in to pry open the latch but the space is too tight to get a hand in...I already removed the air ducts  HELP!!!

Injunfarian -> RE: stalling problems (3/28/2008 7:51:46 AM)

Wish I can help you hear but I haven't replaced mine myself yet(when it happened to me i took it to the stealership and they charged me almost $5000 for a whole new injector and labour).

hnymlk -> RE: stalling problems (3/28/2008 12:41:19 PM)

OK I finished the modification.  It is running GREAT!  I had to heat and custom bend a long flat blade screwdriver to squeeze in between the manifold and the connector to lift the tab.  After that it was not bad.  Mounted the heat-sink on the front of the relay cover just over the windshield fluid container.  Total cost to replace around $650....  Not paying the dealer $5,000...priceless!
Again, thank you all !

3hummers -> RE: stalling problems (3/28/2008 1:39:06 PM)

Glad we could help.

  

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