Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

I NEED HELP!!!!!!!!!

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Haulgas, Nov 11, 2001.

  1. Haulgas

    Haulgas 1/2 ton status

    Joined:
    Mar 25, 2001
    Posts:
    208
    Likes Received:
    0
    Location:
    Phoenix Az
    I've got a problem. My 87 K5 is sick...
    Sometimes when it's going down the road it try's to die then it clears up and run's fine. If it's happins at idle it will die. I turn it off and restart it then it run's fine.I've check for code's in the computer but there aren't any. I've replaced the cap/rotor/ignition module/spark plugs
    I've put on a MSD coil 2 month ago
    The EGR valve move freely
    Any other sugestions?

    IT'S NOT JUST A J**P THING AND I DO UNDERSTAND
     
  2. wayne

    wayne 3/4 ton status

    Joined:
    Feb 1, 2001
    Posts:
    6,178
    Likes Received:
    0
    Location:
    Carlisle, Pa
    Try a new fuel filter and a new pump if it is origional.

    See <a target="_blank" href=http://coloradok5.com/gallery/Waynes-Toy>Project Mighty Mouse</a> here.
    <font color=blue>Wayne<font color=blue>
    <font color=blue>Happy Trails<font color=blue>
     
  3. Haulgas

    Haulgas 1/2 ton status

    Joined:
    Mar 25, 2001
    Posts:
    208
    Likes Received:
    0
    Location:
    Phoenix Az
    Sorry, forgot the pump and filter are also fairly new..

    IT'S NOT JUST A J**P THING AND I DO UNDERSTAND
     
  4. Can Can

    Can Can Pusher Man Staff Member Super Moderator

    Joined:
    Feb 17, 2000
    Posts:
    15,552
    Likes Received:
    136
    Location:
    Cochrane, Alberta, Canada
    How about the 02 sensor?



    <font color=blue> NEVER FORGET, NEVER FORGIVE, NEVER SURRENDER<font color=blue>
     
  5. Haulgas

    Haulgas 1/2 ton status

    Joined:
    Mar 25, 2001
    Posts:
    208
    Likes Received:
    0
    Location:
    Phoenix Az
    Ok I replaced the O2 Sensor and found a broken connetion on my MAP sensor and replaced it . Its still doing it and is getting worse...
    I'm pulling out what little hair I have left.................

    IT'S NOT JUST A J**P THING AND I DO UNDERSTAND
     
  6. Haulgas

    Haulgas 1/2 ton status

    Joined:
    Mar 25, 2001
    Posts:
    208
    Likes Received:
    0
    Location:
    Phoenix Az
    Ok now I've replace the coil. STILL DOING THE SAMETHING!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

    IT'S NOT JUST A J**P THING AND I DO UNDERSTAND
     
  7. Can Can

    Can Can Pusher Man Staff Member Super Moderator

    Joined:
    Feb 17, 2000
    Posts:
    15,552
    Likes Received:
    136
    Location:
    Cochrane, Alberta, Canada
    C'mon guys let give our brother some help. I don't know enough about fuel injection, but I'm sure somebody does!!!!!

    It kinda sounds sensor-related though, beacuse of the intermittent occurence. Almost sounds like a short somewhere. Have you checked the wiring to the fuel pump?



    <font color=blue> NEVER FORGET, NEVER FORGIVE, NEVER SURRENDER<font color=blue>
     
  8. Haulgas

    Haulgas 1/2 ton status

    Joined:
    Mar 25, 2001
    Posts:
    208
    Likes Received:
    0
    Location:
    Phoenix Az
    Yep..... wires to fuel pump are in good shape.
    Thanks for the help.

    IT'S NOT JUST A J**P THING AND I DO UNDERSTAND
     
  9. KRAZIE87K5

    KRAZIE87K5 1/2 ton status

    Joined:
    Feb 23, 2001
    Posts:
    3,369
    Likes Received:
    0
    Location:
    Chicago, IL
    After I replaced the factory (in-tank) fuel pump, I had to replace it frequently afterwards. If I remember right, I went through 4 pumps with that truck! Mine started showing the same symptoms when the pumps started to die... you could mount a $10 fuel pressuer gauge and verify if the pump is maintaining pressure...

    Just my .02... Good luck, and let us know what you find.

    <font color=red>GOT MUD???</font color=red>
    My license plate reads:<font color=blue> 8 YR SUV</font color=blue>
    <a target="_blank" href=http://24.10.209.54/bigolk5.htm>http://24.10.209.54/bigolk5.htm</a>
    454/TH400/NP205 - 14BFF/D60/w/ 4.10s
     
  10. Haulgas

    Haulgas 1/2 ton status

    Joined:
    Mar 25, 2001
    Posts:
    208
    Likes Received:
    0
    Location:
    Phoenix Az
    I put in a GM pump, But I will check that out
    Thanks

    IT'S NOT JUST A J**P THING AND I DO UNDERSTAND
     
  11. Haulgas

    Haulgas 1/2 ton status

    Joined:
    Mar 25, 2001
    Posts:
    208
    Likes Received:
    0
    Location:
    Phoenix Az
    Checked the fuel pressure today . It maintained an avg. of 13 PSI.. Good or bad? When it dies the pump is working . I think it's in the ignition.

    IT'S NOT JUST A J**P THING AND I DO UNDERSTAND
     
  12. FWP

    FWP CRS

    Joined:
    Oct 11, 2000
    Posts:
    3,845
    Likes Received:
    3
    Location:
    Prescott Valley, AZ
    Doesn't fuel injection typically require 30-50 psi????

    <a target="_blank" href=http://coloradok5.com/gallery/75K5>http://coloradok5.com/gallery/75K5</a>
     
  13. 502Burban

    502Burban 1/2 ton status

    Joined:
    Jun 8, 2001
    Posts:
    379
    Likes Received:
    0
    Location:
    Southern California
    I didn't see you mention spark plug wires. If you haven't already checked them, hook an ohm meter to each one at a time, and check for problems while moving the wires a bit. I've had older wires give intermittent problems when there is a break in the conductor. Will work fine until they get moved sometimes.

    Just a guess, though. [​IMG]

    Robb
    '73 GMC Suburban - 502DFI
    <a target="_blank" href=http://community.webshots.com/user/robbrj>community.webshots.com/user/robbrj</a>
     
  14. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

    Joined:
    Jul 23, 2000
    Posts:
    36,178
    Likes Received:
    1,387
    Location:
    E-town baby!
    Throttle body injection requires 10-13 psi at the throttle body, port injection requires high pressure...

    Have you checked the spray pattern of the injectors? They should spray a fine conical mist...any droplets or drips and it will have a big affect on how it runs. The injectors can be chemically cleaned...not the crap you throw in the tank either.

    I'll second checking the plug wires...I had some trouble with bad wires that were near new. They damn near drove me crazy, I had all sorts of weird missing, bucking under medium acceleration and none of it made sense. I found out the wires were bad by chance...huge difference when I changed em.

    Rene

    <font color=green>Dyslexics of the world...UNTIE!</font color=green>
    <a target="_blank" href=http://coloradok5.com/gallery/project_T2> tRusty pics...</a>
     
  15. White Knight

    White Knight 1/2 ton status

    Joined:
    Feb 17, 2000
    Posts:
    889
    Likes Received:
    0
    Location:
    Ft Worth,Texas
    Dude check all the wires leading into the computer, I had a (yes I owned a jeep once) Grand Wagonner that did the same it was a 86, and there was a intermittent short in a lead in wire to the computer, it never registered a code or anything. Good luck mi amigo

    <font color=blue>Veni Sancte Spiritus
    Da Pacem Cordium
    White Knight</font color=blue>
     
  16. Thunder

    Thunder 3/4 ton status

    Joined:
    Jul 20, 2000
    Posts:
    8,946
    Likes Received:
    1
    Location:
    Northeast Nevada
    Does this happen after its warmed up and hot. Or does it happen all the time hot or cold??

    <a target="_blank" href=http://coloradok5.com/gallery/Thunders-Blaze>http://coloradok5.com/gallery/Thunders-Blaze</a>
    <font color=blue>NEVADA: Where the pavement ends, and the West begins.</font color=blue>
     
  17. Haulgas

    Haulgas 1/2 ton status

    Joined:
    Mar 25, 2001
    Posts:
    208
    Likes Received:
    0
    Location:
    Phoenix Az
    It happins when its cold or hot. I just replaced the spark plug wires with MSD 8.5mm and it still did it.This time when I restarted it it pop through the tail pipe (not back fire but pop pop pop ) This is starting to piss me off!!!!!!!!!!!!!!
    Also I did check the wires to the computer and they look fine.

    IT'S NOT JUST A J**P THING AND I DO UNDERSTAND
     
  18. FWP

    FWP CRS

    Joined:
    Oct 11, 2000
    Posts:
    3,845
    Likes Received:
    3
    Location:
    Prescott Valley, AZ
    Thanks Rene[​IMG] I wasn't sure about the psi for TBI. Sorry Brian, just tryin to help out.....

    <a target="_blank" href=http://coloradok5.com/gallery/75K5>http://coloradok5.com/gallery/75K5</a>
     
  19. Haulgas

    Haulgas 1/2 ton status

    Joined:
    Mar 25, 2001
    Posts:
    208
    Likes Received:
    0
    Location:
    Phoenix Az
    Thank for trying Fred....
    This is
    driving me NUTS!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

    IT'S NOT JUST A J**P THING AND I DO UNDERSTAND
     
  20. All I can think of is maybe a catalytic converter getting ready to go south, or the timing (vacuum advance?) is retarding intermintently. I don't even know what might cause that, except maybe a pinhole in the vacuum line. Does it happen right after you hit a bump, or on smooth road? I am at a complete loss of what might be the problem. Distributor cap, maybe. Sorry, thats all I can think of.

    American by birth, Marine by the grace of God
     

Share This Page