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Jerky Blazer... :(

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Capman2k, Jul 2, 2001.

  1. Capman2k

    Capman2k 3/4 ton status

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    Alright, today my Blazer decided to get nasty with me. In the bus depot parking lot it stalled, and it stalled again in the Safeway parking lot. On the road the whole way it would jerk while accelerating. Nothing violent, but still noticable. Get home, check tranny fluid (needs a pint), checked oil (full) and coolant (a few drops, so I filled it up)

    I made an appointment to take the truck in for a tune-up on Thursday morning. I don't want to ask them to check out the jerky-ness, but may have to... Anyone have any ideas about what's up??

    79 K5 Blazer Cheyenne.... That's all I have to say about that.
     
  2. muddin4fun

    muddin4fun 3/4 ton status

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    Like it's bucking? If that's what it's doing, then the tune up will do some good. A clogged fuel filter will do that.

    I've got a mind like a . . . a . . . what's that thing called?

    <A target="_blank" HREF=http://www.geocities.com/muddin4fun79blazer/>http://www.geocities.com/muddin4fun79blazer/</A>
     
  3. muddysub

    muddysub 1 ton suburban status Staff Member Moderator GMOTM Winner

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    my sub used to do that we did the fuel filter and the in-tank pump, but it was goin bad any way. but its probably a fuel filter.

    scott,
    1989 suburban 3/4t 4" lift soon to be rollin on 35s, tbi350
     
  4. Capman2k

    Capman2k 3/4 ton status

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    Bucking about explains it.... "Bucking Blazer" :)..... haha... okay, maybe that's not funny :D Thanks for the input...

    79 K5 Blazer Cheyenne.... That's all I have to say about that.
     
  5. ChevyCaGal

    ChevyCaGal 3/4 ton status

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    My moms car (I know not a Blazer) was doing that, it was a clogged fuel filter and the timing was off....

    I removed my quote so gay, vegetarian, minority, eco-nazis who love Jesus, nuke spotted owls, vote Gore and smoke medical marijuana won't be offend.
     
  6. newyorkin

    newyorkin 1 ton status

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    I read the first 2 lines and thought, "Fuel pump or filter". Was it hard to restart? Are you hearing the pump turn on when you turn the key before you start it?

    Ratch
    <A target="_blank" HREF=http://k5.8m.com>http://k5.8m.com</A>
    **K5 - What more is there to life?**
     
  7. Grim-Reaper

    Grim-Reaper 3/4 ton status Author

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    Folks read...it's a 79.... no electric pump.
    It's the fuel filter. You got a bunch of crud in your tank and it clogged the filter. $3 fix. My guess is your truck sat or wasn't wheeled before you got it. You started wheeling it recently and busted up the crud from the bottom of the tank. You might want to sepnd the $13 and throw a pump on it also. Keep a few filters in the truck and the tools to do the job. It takes 5 minutes to change and if this is due to the truck sitting your going to go through about 4 filters in the next couple months. Both my K5's did the same thing when I started wheeling them.


    It's not my damn planet monkey boy!
    <A target="_blank" HREF=http://communities.msn.com/OffroadK5s>http://communities.msn.com/OffroadK5s</A>

    Grim-Reaper
     
  8. Capman2k

    Capman2k 3/4 ton status

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    Okay... I really don't know much about doing my own repairs and all that... but if we're predicting going through that many filters in such a short time, maybe it's time I learn... Can someone explain how to do this? Maybe with photographs? :D

    Dad still insists that I take it to a shop and have them look at it... grrrrrrr... I don't know why he doesn't let me trust people I meet online :)

    Thanks some more...

    79 K5 Blazer Cheyenne.... That's all I have to say about that.
     
  9. Goose

    Goose 1/2 ton status

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    Go get a Haynes manual that covers your year. That will explain how to do most of the basic stuff and some of the more detailed maintenance. Spend some quality time with your K5...on your back. Crawl under and look around at everything. Go through the book and compare stuff. Before long you'll have a good grasp on things. And when you don't, post a question.
     
  10. gokartergo

    gokartergo 3/4 ton status Staff Member Moderator

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    Go down to your local Napa dealer tell them you want a fuel Filter and ask them to show you were it is. I am not sure were they put it on your rig. It is a 2 minute job.........Dan
     
  11. Grim-Reaper

    Grim-Reaper 3/4 ton status Author

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    Pull your air cleaner off. Looking at the front of the carb you will see the fuel line where it enters the carb. The filter is in that housing. You need a pipe wrench. (It looks like a box wrench with a slot cut into it) I believe it's a 5/8's. You also need a 10 inch crecent wrench. You must hold the big nut with the crecent wrench when tightening or loosening that flare nut. The metal the carb is made out of is soft and you can strip it easy. Flare nuts are prone to sticking so be carefull not to kink that hard pipe. Some fuel will leak out so make sure the engine is cool when you do this. Take the big nut loose and the filter will fall out. There is a spring that holds the filter and it may also fall out. The spring goes in the housing first then filter. Also pay attention to what way the filter is pointed. The solid metal end goes in first.
    When you put the big nut back on it needs to be SNUG NOT TIGHT. Again I cannot stress how soft that metal is and how easy it is to strip out the threads. You must hold that nut when you tighten the Flare nut.
    Fire up the truck (will take a crank or 2 because there is air in the fuel line) and check for leaks. Put the air cleaner on and your good to go. If you have any leaks then the nylon seal on the big nut may be done. You can wrap the threads with teflon tape or hit the parts store and they sell that nylon seal in the help section.

    It's not my damn planet monkey boy!
    <A target="_blank" HREF=http://communities.msn.com/OffroadK5s>http://communities.msn.com/OffroadK5s</A>

    Grim-Reaper
     
  12. muddin4fun

    muddin4fun 3/4 ton status

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    Please learn how to work on it. It will be a life saver one day let alone a money saver. Don't be one of those people that thinks the instructions to change a flat is to get on your cell phone and call Triple A.

    I've got a mind like a . . . a . . . what's that thing called?

    <A target="_blank" HREF=http://www.geocities.com/muddin4fun79blazer/>http://www.geocities.com/muddin4fun79blazer/</A>
     
  13. newyorkin

    newyorkin 1 ton status

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    Ya Grim, I should've read more than the first two lines... Fuel filter would've been my next suggestion, lol.

    Might be a good idea to spray the area with some carb cleaner a little while before you actually start the job, too, if stuff is really filthy. It's no good to get dirt in where the filter would go on top of it, and it makes it easier to wrench.

    Also, Grim, would you think carb cleaner around the fuel line flare fitting would act like penetrating oil, to keep the flare nut from twisting the steel line? Or, do you think penetrating oil would be bad to get in the fuel passage? I'll be doing this soon with my little 2.8, and I came real close to twisting the steel line the first time I did it on this motor.

    Ratch
    <A target="_blank" HREF=http://k5.8m.com>http://k5.8m.com</A>
    **K5 - What more is there to life?**
     
  14. Emmettology 101

    Emmettology 101 3/4 ton status

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    Not doubting anyone esles info that was shared but how old are the spark plug wires? They may be arcing really bad..

    <font color=green>MIKE</font color=green> - "Hukd on fawnics,werkd fer me!"
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  15. Grim-Reaper

    Grim-Reaper 3/4 ton status Author

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    Some of the carb cleaners may work as a penetraing oil. What I have been doing is when I got it appart and dry I put some anti seize or axle grease in there to try to keep it from siezing up and to keep some of the dirt from getting in thext to the nut. Flare nuts are prone to it without the dirt and add the dirt and they become a real pain.
    I had a heck of a time when I replaced the fuel pump on mine. I folded the bottom of the pump. Finaly pulled the alternator and bracket so I could get the pump off with the hard line still on it so I could mess with it on the bench. Even then the hard line was stuck to the nut. I spun it off and stuck it in a can of carb soak for about an hour. That finaly freed it up. Put antisize on it when I reassembled it..Hopefuly it will do the trick. Just one of them fun things with old vehicles.

    It's not my damn planet monkey boy!
    <A target="_blank" HREF=http://communities.msn.com/OffroadK5s>http://communities.msn.com/OffroadK5s</A>

    Grim-Reaper
     
  16. muddin4fun

    muddin4fun 3/4 ton status

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    I had to replace a carb cause no one told me how soft the metal was. [​IMG]. Damn $400 carb re-built! It was a cali emmisions truck so the carb was abnoxious!

    I've got a mind like a . . . a . . . what's that thing called?

    <A target="_blank" HREF=http://www.geocities.com/muddin4fun79blazer/>http://www.geocities.com/muddin4fun79blazer/</A>
     

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