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K5 problems no power then stalling

Discussion in 'The Garage' started by DementedMonkey_co_uk, Aug 14, 2005.

  1. DementedMonkey_co_uk

    DementedMonkey_co_uk Registered Member

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    Hi Guys, Im new on here and to the Blazer (I live in the UK so this truck is a different thing to the Land Rovers that Im normally used to fixing) so forgive me if this is something dumb..

    bought a 1984 k5 with a 6.2 (379cid) diesel yesterday..

    Ran fine when I saw it at the guys house, drove really well for about 100 miles plenty of power etc, kicking down through the auto tranny when I put my foot down etc.. great fun :-)

    But after about 100 miles it sarted losing power (still showing half a tank of diesel) so I thought umm maybe the guage has busted so I put 10 gallons of diesel in it, that pushed it right over the top of the guage so figure it was reading ok... so anyway it drives for a short while goes up into about 2nd gear on the tranny then unless I put my foot to the floor giving it full gas the engine will just stall.. I can get it to do the same thing in neutral as well ie let it tick over its ok give it some gas and rev it it revs really well but it will normally stall at higher revs once I take my foot off the gas again.

    things like the oil pressure seem to be reading ok (whats a normal oil pressure reading for tick over revs??)
    could overheating cause this? as it became apparent after a few miles that the temperature guage in the dash isnt working.
    or is it more likely that its a blockage in the diesel pipes or something?

    Any ideas guys this is really pi$$ing me off as I just spent £2500 on this truck thats like $5000 (they are very rare over here)

    Cheers guys

    ps hope the terms I have used are understandable Ive tried to use american terms for things rather than uk so hope Ive done it right :-) feel free to correct me so I can do this better in the future..
    ps love the site - been really handy when I was chosing my K5 :-)

    Ben
     
  2. Boondocks

    Boondocks 1/2 ton status

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    I don't know much about deisel engines, but it does sound like exhaust blockage.

    I have had a gasoline engine act this way when the catalytic converter broken down and restricted the exhaust.

    Good luck.
     
  3. ryoken

    ryoken Puppy Fabricator Premium Member GMOTM Winner

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    definitely not a diesel expert.... but it sounds like a fuel issue... especially if it was sitting.. maybe filter, lift or injector pump related...

    and welcome to our forum!
     
  4. unclematty

    unclematty 1/2 ton status

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    I'm not a deisel guy but have a little experience with them, sounds kinda like your getting air in the fuel lines, (looses power and then stalls, but will start in neutral and run, not under a load) check all your fuel filters and fuel lines for any kind of a leak/ sucking air.

    my .02 worth :D
     
  5. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    If it was air in the lines it would stall and not be able to be re-started. I'm going to guess if you shut it off and leave it alone for a few hours it'd run OK for a while and then begin to act up again.

    It really sounds like a blocked fuel filter (or almost blocked anyways).

    If you're not that familiar with diesels in general and 6.2's specifically you should spend a bit of time reading in the diesel forum here. One of our members (arveetek) has a 'sticky' post regarding fuel lift pump replacement. Where it pertains to you is how to work on the fuel system without getting your motor air locked.

    http://coloradok5.com/forums/showthread.php?t=69490

    Rene
     
  6. DementedMonkey_co_uk

    DementedMonkey_co_uk Registered Member

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    cheers

    Cheers guys - I have a few things to check over then..:-)
    I also got hold of a Haynes diesel techbook for the engine but still waiting to get hold of a manual like a clymer one for the Blazer, there seems to be some detail in there of some things to check as well so hopefully I can get this sorted..
    problem is over here everything is difficult to get hold of, like parts etc..
    is there any chance that this could be something more serious like injectors or injector pump for example? I'll obvioulsy start with the basics and see what happens but just trying to plan ahead..

    Cheers

    Ben
     
  7. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    I doubt it's anything major. Injector pump and injector problems usually cause poor running (rough idle), excess smoke.

    It sounds to me that the supply of fuel to the IP is being severely restricted.

    Rene
     
  8. DementedMonkey_co_uk

    DementedMonkey_co_uk Registered Member

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    sweet thanks.. it was running great before this started so hopefully your right :-)
    One thing that was kinda odd is that I couldnt get the tranny to kick down again when I was losing power how are these boxes kick downs setup - pull cable or hydraulic? its a 84 blazer and I belive it to be the 700 box the dash shifter shows 1 2 d o - would that be correct?

    thanks
     
  9. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    That would be the 700R-4, and I believe it has a TV cable which controls shift points. Not sure on kickdown, it may be electrical.

    Rene
     
  10. DementedMonkey_co_uk

    DementedMonkey_co_uk Registered Member

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    cool thanks...
    whats a TV cable? not familiar with that type of thing - the Land Rovers I have over here just have a metal cable running which is connected to the throttle and pulls the trannys kickdown link - kinda basic :-)

    Ive found some manuals on ebay but waiting for the guy to reply to see if he will ship to the UK so hoefully will have less stupi questions soon :-)

    if anyone else has a workshop manual and maybe an owners manual that they would sell me and ship to UK that'd be just sweet..

    Cheers

    Ben

    1984 6.2 blazer 700r-4 tranny - what else would you need to know for finding the correct manual..?
     
  11. randy88k5

    randy88k5 1/2 ton status

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  12. DementedMonkey_co_uk

    DementedMonkey_co_uk Registered Member

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  13. Kiwi John

    Kiwi John 1/2 ton status

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    UK Help

    Hi Ben. I sent you an e.mail earlier with my contact details. I'm in West Sussex near Gatwick.

    Sounds like you have a blocked fuel filter. The thread that Rene pointed to is brilliant and you should read that asap.

    I got my manuals from J.C.Whitney in USA by courier in about a week. They are a big aftermarket parts company it seems and they are very helpful.
    All the info you'll ever need is in this website somewhere. These guys are the best! :D
     
  14. DementedMonkey_co_uk

    DementedMonkey_co_uk Registered Member

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    Hi all.. finally got round to checking this over properly and found what the problem is..
    Theres a pressure relief type valve which screws into the top of the injection pump this goes to the return line.. Theres a ball in the valve which should retain the fuel pressure needed by the pump, but what is happening is that dirt of some sort seems to have made its way into the IP and is clogging the valve and blocking it open, therefor the fuel pressure drops and it loses power...
    so good Ive cleaned the valve with compressed air and it works again, then about 2 miles down the road it gets blocked again - HOW??? Ive got an inline filter in the diesel line before my electric fuel pump and the main big black box one, so how is dirt making its way to the IP?? Could the black box filter have broken? Ive only just put the inline filter in place and no dirt is coming in from the diesel tank now (may have been before this) - but maybe there is still some in the black box filter or the IP??

    Cheers

    Ben
     
  15. DementedMonkey_co_uk

    DementedMonkey_co_uk Registered Member

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    Hi John..

    Good to hear there are some ther UK K5 owners on here as well.. I shall check that company out and see if I can get a new filter and the manuals :-)

    Where do you get general spares from in the UK? or do you get everything shipped over?

    Cheers

    Ben
     
  16. Kiwi John

    Kiwi John 1/2 ton status

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    Hi Ben. Someone on this forum will have an answer for you i'm sure.This post will take your thread back to the top (ttt) so you may get an answer soon.
    If you have dirt in your injection pump then you have a problem of the expensive kind i fear. Normally you would need the pump overhauling (specialist job).
    Then you will have to clean all your fuel lines and fit new filters.
    Parts can be got from USAutomotive and North American Motor Co.
    Both advertise in Classic American mag.
    NAMCo are more local to me so I use them.
    Make sure you read the thread that Rene pointed you to.!
    Surely there are plenty of USAirforce techs in your pubs up there who work on the diesel Blazers on-base. Ask around maybe.
     
  17. Gabriel Nicolae

    Gabriel Nicolae Newbie

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    Hi, just to let you know that somebody else in Europe has the K5 6.2...which is me! But not in UK, in Romania, Eastern Europe. I own a very recently lifted 4" Pro comp, 35" tires K4...so far...
    The staff I need I'm importing it from Us directy...

    O, yeah...I have also a Nissan Patrol Gr with a 6.2, TH400 and NP208 installed by myself, as a hollyday truck...also 4" and 35" BFG MT, 8274 and rear locker.

    Take care, Gabi
     
  18. Kiwi John

    Kiwi John 1/2 ton status

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    Hello Gabi.
    I did see your post on the Introduction thread, but I thought you were too far away for contact. I'm novice on computer & internet so I forgot how close everyone is really, just a click!
    How did you come by a K5 in Romania?
    Most of the Diesel trucks here seem to be US Army or Air Force surplus.
    Mine was a private import though, probably from an American serviceman nevertheless.
    Would you be able to tell me which contacts you have in US for parts please?
    Also, could you post-up a picture of your K5 AND the Nissan?
    Best wishes. John.
     
  19. Kiwi John

    Kiwi John 1/2 ton status

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    Thanks Randy for the TV adjust link.
     

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