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Wierd TBI problem: Runs, but doesn't start.

Discussion in 'The Injection Section' started by DavidB, Mar 31, 2007.

  1. DavidB

    DavidB 1/2 ton status

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    I think the fuel pump isn't running the few-second prime cycle when I turn the key on. Won't start if I get in and crank it unless it's just been running. If I give it some starting fluid, it fires up and runs fine. Fuse, computer, wire? It's been flipped and beat. Wheeling trip tomorrow, repairing the frame and gonna try to fix TBI tonight if I have time after the frame. Ideas anyone?

    Thanks
     
  2. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    Replace the fuel pump relay first, cheap and easy. Located on the firewall just to the left of center (passenger side).
     
  3. Jason4x4

    Jason4x4 1/2 ton status

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    I've seen a tps do that. If it went bad, and is showing the computer that you are at wot, it won't pulse the injectors during crank, but will when running.
     
  4. DavidB

    DavidB 1/2 ton status

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    Thanks guys. Didn't get to it last night, but noticed the exhaust burns the eyes and nose bad. Hope it doesn't poop out on me today.
     
  5. DavidB

    DavidB 1/2 ton status

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    Bought a TPS and Relay this AM wheeled all day no time to wrench on it. Later...whole Blazer needs torn apart and the drivetrain put in something else. It's done.
     
  6. Bowcrazy

    Bowcrazy Registered Member

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    Wished I had seen this before I worked on mine.Would have saved me alot of time and money
     
  7. DavidB

    DavidB 1/2 ton status

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    Still haven't fixed mine. Something is unplugged up by the TBI but I don't see what it's supposed to be plugged into.

    PLUG.jpg
     
  8. dyeager535

    dyeager535 1 ton status Premium Member

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    That's for a relay of some type. Don't think any of the GM fuel pump relays were that style (oval relay body) but other things did.
     
  9. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    My 89 blazer has the oval fuel pump relay.
     
  10. DavidB

    DavidB 1/2 ton status

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    That was the relay. It was missing entirely. Surprised it ran. Stupid me. Guess flipping/beating it made it fall off. Here's a link to my phone album. I hooked up the relay, but there's a red wire hanging out of the pigtail and an empty mounting tab next to the relay. Anyone know what goes there? Also there is a pic of my coil. One wire isn't hooked up, there's a wire coming off the loom on the firewall that looks like it might go there, dunno.

    link
     
    Last edited: Apr 14, 2007
  11. sandawgk5

    sandawgk5 3/4 ton status

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    The connector on the fuel pump relay is a test connection for the relay. You can actually put 12 Volts to that tab and the pump should turn on. I also want to say the if you put a volt meter on it it should read 12V for about 3 sec when the key is turned from off to Run.

    The connector on the coil is the Tach connection. It looks similar to the connector on the fuel pump relay. The only wires that get hooked to the distributor have weather pack connectors on them.

    Ira
     
  12. DavidB

    DavidB 1/2 ton status

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    Thanks n stuff.

    How's it going?
     
  13. dyeager535

    dyeager535 1 ton status Premium Member

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    Sweet. For some reason the '80's TPI stuff used a different one. At some point I'll be converting to the oval, so all my relays (fan1, fan2, MAF, MAF burnoff, fuel) are interchangeable. :)
     

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