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Thread: Need serious help

  1. #1
    Registered User Blaz90's Avatar
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    Need serious help

    Ok, let me start by sayin' "I'm a dumbass!"
    Here's what happened:
    I had a short in the the driver side power window circuit that fried the switch.
    I got a cheapie 6 pin switch at the parts store and hooked it up.
    The wrong way!(this is the dumbass part)
    So I had the truck running when I hit the window switch to test it.
    The truck shut off.
    And now will not restart.
    Ok, so at this point, I guess I better tell you what it is.
    1990 S-10 Blazer, 2DR, 2WD, 4.3L V6
    So I started trouble shooting:
    Fuses under dash all good.
    Has spark
    Has fuel, not sure if its max fuel pressure, but we get fuel.
    Ran codes, and wasn't throwing anything but 12
    Check the relays on the firewall, for fuel pump
    Fuel pump runs at key on
    Have all guages and power to everything at key on
    Will turn over at start, but won't fire
    Changed out the ECM
    Now the check engine light flashes really fast continuiously
    Checked codes again and get a 51, which is ECM, PROM, and/or MemCal
    ECM is brand new
    I have an extra PROM, switched that, makes no difference
    The only thing I haven't done that I can see it to test all the fuseable links to the ECM
    or switch out the MemCal(don't have one)

    Anyone have this problem before or have any ideas of something I might be missing?
    Please help
    Thanks in advance,
    90

  2. #2
    Registered User Blaz90's Avatar
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    Oh, forgot to say that I fixed the window switch!

  3. #3
    Blazin no mo Forklift's Avatar
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    Id check the fuseable links if I were you. Pop open the bottom of the dash and check for power at both of the big red power wires at the ignition harness
    04 EC Silverado 4.8L,Pioneer, Rockford Fosgate, K&N, Viper, ACT, USSpeedo, Matrix, Whelen, Blackbear, 22" Eagles, Nittos,Russel,Magnaflow
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  4. #4
    Registered User Blaz90's Avatar
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    Ok, looks like all the fusable links and electrical checks out, so I moved back to double check the fuel.
    I'm getting fuel but not enough(just a few drops), so its going to have to be the pump or a clog.
    Going to start with the filter.
    Any other recommendations on things to look for or look out for?

  5. #5
    5.7L VORTEC 350 blazin4low's Avatar
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    sounds like your on the right track, I would test the voltage at the pump. I was getting 11.2 volts at the pump, changed the relay and got 12.1 at the pump. Blazer ran great for a month and then the pump went out
    http://i158.photobucket.com/albums/t114/VortecBlazer/sidredo.jpg
    Tuned by Bland Tuning
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  6. #6
    Registered User Blaz90's Avatar
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    changed out the fuel filter today, just to make sure it was not clogged.
    Didn't do it.
    Should have time to get to the pump later in the week or next weekend.

  7. #7
    5.7L VORTEC 350 blazin4low's Avatar
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    the pump plug run along the cross frame between the rear bumper and fuel tank.....should be able to unclip the plug and check the voltage without dropping the tank.....if that reads good, you most likely have a bad pump
    http://i158.photobucket.com/albums/t114/VortecBlazer/sidredo.jpg
    Tuned by Bland Tuning
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  8. #8
    Registered User Blaz90's Avatar
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    Well I finally got around to changing out the fuel pump, doesn't look like the pump itself was bad, but we changed it anyway. Found the screen pretty clogged and the little rubber hose section was ruptured.
    Just replaced everything and it fired right up.
    LOL
    Not even related to the power surge.
    Crazy.
    Thanks for the posts!
    90

  9. #9
    5.7L VORTEC 350 blazin4low's Avatar
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    Quote Originally Posted by Blaz90 View Post
    the little rubber hose section was ruptured.
    there it is
    http://i158.photobucket.com/albums/t114/VortecBlazer/sidredo.jpg
    Tuned by Bland Tuning
    Transmission built by Transbuilderguy on FSC!
    Marine Intake swap by me

  10. #10
    Upright Member smsmith36's Avatar
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    It's weird how something can go bad that has nothing to do with what you were working on. I used to have an 86 Monte Carlo SS. I pulled the radiator to get a leak fixed. When I put the radiator back in it wouldn't start. Turned out the ignition module went bad. What's the chance of that happening?
    Genius by birth, Slacker by choice.

  11. #11
    Registered User wagonmaster's Avatar
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    The automotive gods have a weird sense of humor...

  12. #12
    Administrator Blazin Low's Avatar
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    Same type of shit happened to me with my '87.

    I worked on something, then it started running TERRIBLY. Concentrated for weeks on the particular thing I worked on, but like you, ended up being a fuel pump change that fixed it.
    this is a test of the sig

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