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.

Wierdest problem, truck keeps cuttin' off....

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Boss, Feb 7, 2002.

  1. Boss

    Boss 1/2 ton status Author

    Joined:
    Feb 17, 2000
    Posts:
    2,550
    Likes Received:
    0
    Location:
    Maryland
    Wierdest problem, truck keeps cuttin\' off....

    Well, a while back, some of yall might remember I had this problem; the truck kept cutting off on left hand turns and stuff. Thought it was the fuel pump. But it was actually b/c my steering column was soo loose and after I fixed that, the "cut off" problem hasn't happened in since. (this was about 2 months ago.)

    BUT, recently, I noticed, that if I get the truck near 1/2 tank of gas left, then every left turn I make (like long lefts or going around a long curve (towards the left)), then the truck will want to cut off or just cut off. I noticed that the gas guage would climp up close to full though. This never happens during my right hand turns though, only lefts. I can pop the truck in Neutral and crank it up and drive again though, but it's just nerve racking with all these "tail riders." The sending unit I have is like 8 months new from GM, btw. Like during my lunch break, I was going around a long left curve ramp, the truck would cut out and cut back in and cut out and cut back in, etc....scary ride with my detroit too. I would keep giving it more gas to keep it from cutting out completely. I'm going to replace the fuel pump this weekend with the Walbro unit I bought a while back, but I'm not even sure if this could be the problem. I heard this happening when the truck is like almost empty, but mine is at half. Any suggestions?

    Secondly, another wierdness just started too. This morning, when I cranked the truck on, it started like normal. But then when I turned the headlights on, it cut my stereo off and started sputtering. Idling very bad. No check engine light though. Then when I started it to go to lunch and turned the headlight on, no problems. I stopped by the metal supplier shop during lunch to pic up some stuff and when I started it up to leave and turn the head light on (it's a dark rainy day here), same thing, cut my stereo off and idled bad. I drove away all good though (except for all my left turns [​IMG]. Any ideas here? Thanks for any help.
    Boss

    Pic of my truck Before N' After
    <a target="_blank" href=http://coloradok5.com/gallery/BeforeNAfter>http://coloradok5.com/gallery/BeforeNAfter</a>
     
  2. Boss

    Boss 1/2 ton status Author

    Joined:
    Feb 17, 2000
    Posts:
    2,550
    Likes Received:
    0
    Location:
    Maryland
    Re: Wierdest problem, truck keeps cuttin\' off....

    Btw, it's an 89' K5, 350 TBI, motor is totally stock; 26 gallon tank.
    Boss

    Pic of my truck Before N' After
    <a target="_blank" href=http://coloradok5.com/gallery/BeforeNAfter>http://coloradok5.com/gallery/BeforeNAfter</a>
     
  3. muddin4fun

    muddin4fun 3/4 ton status

    Joined:
    Feb 19, 2001
    Posts:
    5,644
    Likes Received:
    0
    Location:
    N Texas
    Re: Wierdest problem, truck keeps cuttin\' off....

    hmmmmm....I wonder if you have a ground problem that would cause both those problems?

    <font color=green>Can't sleep...the clown will get me</font color=green>

    <a target="_blank" href=http://www.bluefox.tv/~lara>My Wonderful Site</a>
     
  4. Boss

    Boss 1/2 ton status Author

    Joined:
    Feb 17, 2000
    Posts:
    2,550
    Likes Received:
    0
    Location:
    Maryland
    Re: Wierdest problem, truck keeps cuttin\' off....

    You talking about the ground from the Sending unit/Fuel Pump?
    Boss

    Pic of my truck Before N' After
    <a target="_blank" href=http://coloradok5.com/gallery/BeforeNAfter>http://coloradok5.com/gallery/BeforeNAfter</a>
     
  5. txbartman

    txbartman 1/2 ton status

    Joined:
    Jun 1, 2001
    Posts:
    1,975
    Likes Received:
    0
    Location:
    Plano, TX
    Re: Wierdest problem, truck keeps cuttin\' off....

    I.m with Laura. Sounds like it could be a bad ground. You have an electric fuel pump, so any impact to your electrical system could also be impacting your fuel flow. As far as the left turn goes, all I can think is that maybe there is a wire that is being impacted by your left turns. Do you get any electrical oddities inside the cab when the engine sputters? May be hard to focus on stuff like that when you are trying to keep it running, though!

    Could be two separate problems, but could be related as well. I would check all your grounds first, though.

    Brian
    Check out <a target="_blank" href=http://tx85gmcguy.alloffroad.com>My Jimmy</a> with all her projects!
     
  6. muddin4fun

    muddin4fun 3/4 ton status

    Joined:
    Feb 19, 2001
    Posts:
    5,644
    Likes Received:
    0
    Location:
    N Texas
    Re: Wierdest problem, truck keeps cuttin\' off....

    It could be there, it could be your battery terminals. Grounds are fun [​IMG].
    If it's related to your headlights, I would think it's one of the bigger grounds ya know?
    I would just go thru and clean the battery terminals and make sure all your connections are good and clean and see where that gets you. If you have my luck, it will be the ground for the interior light or something LOL!

    <font color=green>Can't sleep...the clown will get me</font color=green>

    <a target="_blank" href=http://www.bluefox.tv/~lara>My Wonderful Site</a>
     
  7. Boss

    Boss 1/2 ton status Author

    Joined:
    Feb 17, 2000
    Posts:
    2,550
    Likes Received:
    0
    Location:
    Maryland
    Re: Wierdest problem, truck keeps cuttin\' off....

    Cool, I'll check the grounds. Starting with the one for the fuel pump/sender. Besides the truck cutting off and stuff during left turns, I didn't "notice" any other odd problems. Radio still on and head light still works and stuff. Just no fuel to the injectors I guess???
    Wierd thing is that it will crank back on immediately, so that's what's keeping from thinking that it's a bad fuel pump. You're probably right about the grounds though. I'll check everything!!
    Boss

    Pic of my truck Before N' After
    <a target="_blank" href=http://coloradok5.com/gallery/BeforeNAfter>http://coloradok5.com/gallery/BeforeNAfter</a>
     
  8. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

    Joined:
    Jul 23, 2000
    Posts:
    36,180
    Likes Received:
    1,388
    Location:
    E-town baby!
    Re: Wierdest problem, truck keeps cuttin\' off....

    How about a bad tank baffle allowing the fuel pump to suck air momentarily during a left hander? If it was electrical it should do it regardless of how much fuel it has...

    I agree on the headlight/sputtering problem probably being a bad ground somewhere.

    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>
     
  9. Boss

    Boss 1/2 ton status Author

    Joined:
    Feb 17, 2000
    Posts:
    2,550
    Likes Received:
    0
    Location:
    Maryland
    Re: Wierdest problem, truck keeps cuttin\' off....

    Ok, I'll mention this too then. I run dual batts with Hellroar BIC. I have a Brand New Optima Yellow (5 mo. old) (as main) and new Champion Batt (4 mo. old) as the Back up (nothing hooked up to that one, except the BIC). Also have a brand new 200 amp alt (about 6 mo.). All my batt cables are brand new too. Silly me didn't think it was electrical related so I didn't mention any of that, sorry. I will check em though and search search for all grounds. It's just strange how the headlights could be related to the fuel. Then strange how only left turns cut my truck off, why not right turns? Anyhow, iIt's going to be a long weekend :( Thank you both for yalls suggestions :)
    Boss

    Pic of my truck Before N' After
    <a target="_blank" href=http://coloradok5.com/gallery/BeforeNAfter>http://coloradok5.com/gallery/BeforeNAfter</a>
     
  10. Boss

    Boss 1/2 ton status Author

    Joined:
    Feb 17, 2000
    Posts:
    2,550
    Likes Received:
    0
    Location:
    Maryland
    Re: Wierdest problem, truck keeps cuttin\' off....

    Hey Rene, excuse my idioticy, but what's a tank baffle? [​IMG] I thought, all that was in the tank was the sender and fuel pump, which attatches the sender (and that has a net like think as filter.) Atleast this is all I noticed when I had it out last year when I replaced the sender.
    Boss

    Pic of my truck Before N' After
    <a target="_blank" href=http://coloradok5.com/gallery/BeforeNAfter>http://coloradok5.com/gallery/BeforeNAfter</a>
     
  11. muddin4fun

    muddin4fun 3/4 ton status

    Joined:
    Feb 19, 2001
    Posts:
    5,644
    Likes Received:
    0
    Location:
    N Texas
    Re: Wierdest problem, truck keeps cuttin\' off....

    I think the baffles keep the fuel from sloshing around.

    <font color=green>Can't sleep...the clown will get me</font color=green>

    <a target="_blank" href=http://www.bluefox.tv/~lara>My Wonderful Site</a>
     
  12. HarryH3

    HarryH3 1 ton status Author

    Joined:
    May 31, 2000
    Posts:
    10,384
    Likes Received:
    2
    Location:
    Georgetown, TX
    Re: Wierdest problem, truck keeps cuttin\' off....

    My S-Jimmy was doing wierd stuff like this a while back. Right turns would make it start stumbling. Taking off from a standing start would make it buck until the engine reached 2K rpms or so. But once the engine was fully warmed up, it didn't happen any more. I finally happened to notice that the tiny return spring for the thermac in the air cleaner snorkle was broken. I fixed that and it has never stumbled since! [​IMG]

    Best I can figure is that turning right or taking off from a stop was swinging the flap closed and limiting air to the engine. Once the engine got up to enough speed, it was drawing enough air to force the flap open. Also, once the engine warmed up enough, the thermostat was pushing the flap open. Drove me nuts trying to find that one! [​IMG]

    As for your electrical problems, check that the ground strap is well connected between the engine and frame. If that's loose, then all sorts of gremlins can appear.

    <font color=black>HarryH3 - '75 K5</font color=black>
    <a target="_blank" href=http://www.angelfire.com/super/ThunderTruck>www.angelfire.com/super/ThunderTruck</a>
    It's a great day to be alive...
     
  13. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

    Joined:
    Jul 23, 2000
    Posts:
    36,180
    Likes Received:
    1,388
    Location:
    E-town baby!
    Re: Wierdest problem, truck keeps cuttin\' off....

    There are bafle plates in the tank around the fuel pick-up area to keep a pocket of fuel where the pick-up is. I've heard the baffles are plastic and prone to breaking. This could be allowing the fuel to leave the pick-up area during even a mild corner. Watch your fuel gauge as you corner...if it drops or raises a fair bit when you corner you could have a bad baffle and the pump could be momentarily sucking air.

    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>
     
  14. Burt4x4

    Burt4x4 3/4 ton status

    Joined:
    Feb 17, 2000
    Posts:
    6,854
    Likes Received:
    0
    Location:
    California (Modesto area)
    Re: Wierdest problem, truck keeps cuttin\' off....

    Hey Boss ~ That head light issue sounds like the Alt is not fired up yet(normal). I know my alt doesn't start puttin out juce untill a good minute or so has gone by right after start up! Do you have the remote module(in cab LED) with your BIC??
    I guess HighAMp alts take a bit longer to 'wind up' before they start chargin!!
    I think I read somewere that when you have a dual batt setup it is recomended that both batts are exsactly the same make and model, duno how true that is???
    Don't have a clue about the Left turn deal[​IMG]!!!!!!!!


    72K5[​IMG]Led Zeppelin[​IMG]Rock ON![​IMG]
    <a target="_blank" href=http://coloradok5.com/gallery/Burt4x4>http://coloradok5.com/gallery/Burt4x4</a>
     
  15. Innerpiece

    Innerpiece 1/2 ton status

    Joined:
    Feb 22, 2001
    Posts:
    145
    Likes Received:
    0
    Location:
    Mississippi (Yee Haw)
    Re: Wierdest problem, truck keeps cuttin\' off....

    I recently had something similar -- altho not turn related

    Look at your wiring diagrams -- there is an orange wire that provides "unfused" juice to everything that is hot at all times ... headlights, fuel pump, interior lights, stereo memory, etc. Check and see if, when the car dies, the lights go out or the interior lights die.

    In my case, the juice started at the battery, through a huge wire to the starter solenoid, throught a fuseable link and then on ... that fuseable link is damn close to the passenger side exhaust manifold. Basically, the insulation had melted and when I would drive over a curb it would ground out killing the motor. This, in turn, fried the starter solenoid over time and it started doing really weird things (cranking with no juice to fuel pump, no headlights, no interior lights) at really odd times. It seemed like a big electrical gremlin until I got it all chased down.

    It WAS NOT a grounding problem, it was a supply problem as everything along the orange wire path is wired up sort of in series.

    Good luck
     
  16. Boss

    Boss 1/2 ton status Author

    Joined:
    Feb 17, 2000
    Posts:
    2,550
    Likes Received:
    0
    Location:
    Maryland
    Re: Wierdest problem, truck keeps cuttin\' off....

    Harry,
    Thanks for your thoughts man. I'll be sure to check that ground strap out.

    Rene,

    Well, it probably could be the baffles then. B/c I do notice that on the left turn, my fuel starts to move towards full. It even made it to full before. Truck cuts off and stuff right when it gets to around 3/4 full. But on right turns, the guage does not move at all. I don't know what this baffle looks like, but it's its two pieces or what not, then maybe the one that keeps fuel in place on left turn (body rolling toward the left) broke off. Sucks that it's plastic, so I can't just stick a magnet in there to pull it out.

    Burt,
    Yes, I do run the remote switch with the BIC. (BIC is mounted high up away from danger btw). If you're right about high amp alts taking a while to wound up, then I'm a happy camper that it aint a problem with the truck. Wierd thing is though, that it just started doing this today...??? Never before. How bout you?

    Inner,
    Yeah, I actually looked at that wire from the starter solenoid to the (in my case) the BIC. (yours, it went to the battery). It's a new wire, 2 guage , and it looked good. I only checked that b/c it was really visable and since it is right next to the exaust pipe/manifold. I have wire wraps in the area to help protect it a little from the heat.
    Thanks everyone :)
    Boss

    Pic of my truck Before N' After
    <a target="_blank" href=http://coloradok5.com/gallery/BeforeNAfter>http://coloradok5.com/gallery/BeforeNAfter</a>
     
  17. Confederate9

    Confederate9 1/2 ton status

    Joined:
    May 29, 2000
    Posts:
    1,686
    Likes Received:
    0
    Location:
    Greensboro NC
    Re: Wierdest problem, truck keeps cuttin\' off....

    there are the grounds for the fuel pump located?
    i have an 85, and sometimes if my truck is at 1/2 full and it hasnt been run for 3days, it will do that when i stop.

    <font color=red>K5: Because size DOES matter</font color=red>
    85 K5 4IN LIFT 35 GOOD YEAR WRANGLER MT/R, AMERICAN RACING WHEELS
     
  18. dyeager535

    dyeager535 1 ton status Premium Member

    Joined:
    Dec 13, 2000
    Posts:
    26,982
    Likes Received:
    190
    Location:
    Roy WA
    Re: Wierdest problem, truck keeps cuttin\' off....

    You say that you are replacing the in-tank pump?

    Check that the tank wasn't A) already swapped, or B) the baffle isn't broken as suggested.

    Anyone thats replaced an in-tank TBI pump on the K5, are the plastic baffles what I'm used to seeing in the cars? Rather complex, labyrinth like, basically covering as much tank area as you can see? The non-injected cars had just one single steel "baffle" about halfway back in the tank instead, I'm assuming just to keep the float from acting wacky when you sped up and slowed down.

    Dorian
    My tech/links page: <a target="_blank" href=http://www.dorianyeager.com/index2.html>www.dorianyeager.com/index2.html</a>
    Why insist on counting when the ring gear has the tooth counts stamped in?
     
  19. wayne

    wayne 3/4 ton status

    Joined:
    Feb 1, 2001
    Posts:
    6,178
    Likes Received:
    0
    Location:
    Carlisle, Pa
    Re: Wierdest problem, truck keeps cuttin\' off....

    It sounds like a bad baffle in the tank. When you drop the tank to put the pump in you will be able to find out.

    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>
     
  20. Burt4x4

    Burt4x4 3/4 ton status

    Joined:
    Feb 17, 2000
    Posts:
    6,854
    Likes Received:
    0
    Location:
    California (Modesto area)
    Re: Wierdest problem, truck keeps cuttin\' off....

    When your Alt turns on, with the remote switch in the center position, the LED will light at the same time. I am running a PowerMaster Alt and I tlaked to them about the delay and they said that is the way it is desined to work? If my rig has been setting all week and I fire it up it takes a good minute before my alt truns on. If I just shut it off and runinto the store then when I fire back up the alt starts up right away!!?? So it seams like the HighAmp alt has some kinda of capasitor storage of somekind that need to build up the voltage before it starts to apply it to the batteries!!
    Good Luck

    72K5[​IMG]Led Zeppelin[​IMG]Rock ON![​IMG]
    <a target="_blank" href=http://coloradok5.com/gallery/Burt4x4>http://coloradok5.com/gallery/Burt4x4</a>
     

Share This Page