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  1. #1

    No Fuel Injector pulse

    I'm not getting a fuel injector pulse for the injectors. I used a noid light on the injector harness and no pulse. I thought it might the ECM driver and the ECM in the vehicle is brand new. So i tried another ECM from the same type of car and the same service number and still nothing. I installed the new ECM back and and did a computer scan and i got a code 12 from both ECM's. Checked all the fuses and they all checked out fine. I have 42 psi at the fuel rail. Any ideas where else to look would be greatly appreciated. Thanks.
    1989 Oldsmobile Cutlass Supreme
    2.8L engine
    V6

  2. #2
    Robby1870's Avatar
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    Re: No Fuel Injector pulse

    Have you tried the injector fuses?

    EDIT: Nevermind, I read your post wrong

    Lemme think more.
    Robby Whitesell
    2006 Pontiac G6 GT - 3500 V6

    1985 Toyota Pickup DLX - 2WD - 2.4L I4

  3. #3

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    Re: No Fuel Injector pulse

    The ECM doesn't know when to fire the injectors if it doesn't know if the crank is turning......crank sensor maybe?
    Do you have spark?
    -David
    13 GMC Terrain Denali
    05 Chevrolet Impala SS
    94 Honda VF750 Magna
    91 Chevrolet S10

  4. #4

    Re: No Fuel Injector pulse

    Quote Originally Posted by Bossman429
    The ECM doesn't know when to fire the injectors if it doesn't know if the crank is turning......crank sensor maybe?
    Do you have spark?
    Yes i have spark and i had the ICM checked and it was fine. Brand new ICM.

  5. #5
    Mach 5's Avatar
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    Re: No Fuel Injector pulse

    Check the resistence of the injectors. I just had a problem with mine. It should read 12.5- 16 ohms. If they are 12 and under, they are on there way out.

    To do the procedure you will need to remove the upper intake manifold. That will result in a new gaskets. You will have to remove the hoses and everything in the back as well as the throttle body and the egr valve. Its a pain but is well worth it. Check alldata for additional directions and torque specs. You can also use www.autozone.com 's alldata which is free for help.
    Founder of the Radical Revs Racing Team- Radical Revs Race Mods
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    Mach 5-1989 Pontiac Grand Prix SE- LG5 swap, GT3076r, Getrag 282, Birchmount
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  6. #6

    Re: No Fuel Injector pulse

    Quote Originally Posted by Mach 5
    Check the resistence of the injectors. I just had a problem with mine. It should read 12.5- 16 ohms. If they are 12 and under, they are on there way out.

    To do the procedure you will need to remove the upper intake manifold. That will result in a new gaskets. You will have to remove the hoses and everything in the back as well as the throttle body and the egr valve. Its a pain but is well worth it. Check alldata for additional directions and torque specs. You can also use www.autozone.com 's alldata which is free for help.
    I tested the injector resistance and i get 12.5 on all 6 injectors. So the injectors test ok.

  7. #7
    Mach 5's Avatar
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    Re: No Fuel Injector pulse

    ok well then check all your wiring to those injectors. Do a condinuity check on it. It could be a broken or shorted out wire. I believe all the wiring is interconnected in a series circuit per odd and even side of the engine.

    12.5 ohms means that the life on the injectors is winding down. Also the injectors must be within 10 % of the highest ohm. If you have 80k + miles on them they should be considered a major tune up as they will cause problems in the future.

    I would check the wiring and the crank position sensor as well. Check the injectors first since you got the engine all apart anyway.
    I believe the problem lays somewhere along these lines.
    Founder of the Radical Revs Racing Team- Radical Revs Race Mods
    -Jarek-
    Mach 5-1989 Pontiac Grand Prix SE- LG5 swap, GT3076r, Getrag 282, Birchmount
    Racer X- 1990 McLaren TGP- GTX3582r high boost- Getrag 284- Tilton Twin disc- LG5 w/ 34xx race heads, race cam, custom intake
    1985 AE86- 4age 20v, supra trans, 4.78:1 final
    1987 Mitsubishi Starion- 2.6l turbo 5spd still figuring all options

  8. #8

    Re: No Fuel Injector pulse

    Quote Originally Posted by Mach 5
    ok well then check all your wiring to those injectors. Do a condinuity check on it. It could be a broken or shorted out wire. I believe all the wiring is interconnected in a series circuit per odd and even side of the engine.

    12.5 ohms means that the life on the injectors is winding down. Also the injectors must be within 10 % of the highest ohm. If you have 80k + miles on them they should be considered a major tune up as they will cause problems in the future.

    I would check the wiring and the crank position sensor as well. Check the injectors first since you got the engine all apart anyway.
    I believe the problem lays somewhere along these lines.
    I have a subscription with alldata and i checked what the min and max resistance should be and it was between 11.60-12.60 and the crank sensor was the first thing i checked. It's brand new and checks out fine.

  9. #9

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    Re: No Fuel Injector pulse

    Did you check to see if your getting fuel to the rails? There should be a little bleeder valve you can check at.

    I don't know if you have one or not, but pick up a fuel pressure guage from your local parts store. I bought one a while back(and it was stolen when I moved ) from Murray's I believe that was pretty decent($40-ish).

    That, and check your fuel pressure regulator.
    Chris D.-
    '02 Buick Century- Wife's
    2012 Jeep Grand Cherokee- Company Car/DD

  10. #10

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    Re: No Fuel Injector pulse

    If you have alldata look at the diagnostic flow chart for a cank no start situation.
    My bet is on crank sensor
    -David
    13 GMC Terrain Denali
    05 Chevrolet Impala SS
    94 Honda VF750 Magna
    91 Chevrolet S10

  11. #11
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    Re: No Fuel Injector pulse

    Check the connectors on each of the injectors to make sure they are tight. I had an injector not want to fire b/c the connector was loose.
    - Mike K.
    '94 Oldsmobile Cutlass Supreme SL 4AT - For Sale
    '00 Subaru Outback AWD 5MT - Soccer Mom Pimpin'
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