Question about 1989 Chevrolet C/K 3500

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Wont start i have a 1989 chevy 3500 with a 454 throttle body, engine isnt getting fuel, there is fuel to throttle body with good pressure, the injector fuse is not blown and wiring has no obvious shorts, where do i start tracking down the problem?

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  • hemi347 Aug 21, 2008

    there is no injector pulse, spark is ok, engine will run if i spray gas
    or ether down barrels. any ideas on what wires to track down for
    testing? thanks lots for your help!

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Make sure that you're getting spark. A very common thing on these engines are coils going bad. If you can verify spark, check to make sure you have an injector pulse. As you rotate the engine, look inside of the throttle body and make sure that you see fuel pulsing into the engine. You can still have good pressure but you don't have an injector pulse, the fuel still cant get into the engine. You can use a test light as well to test for an injector pulse. One wire going to the injector will have constant power and the other will blink when the engie is rolled over. Does it start if you spray starting fluid into the throttle body? If it does, it's a fuel delivery problem. Again be sure you have spark from coil to distributor and plugs. You can remove the ignition module and take it to NAPA and they have a module tester. Have them test the module several times not just once. This will eliminate the possibilites of an intermitted problem. Let me know how it does. tiqautoperformance@live.com

Posted on Aug 21, 2008

  • Lee Quiroz
    Lee Quiroz Aug 22, 2008

    The colors of the injector wiring is the same at the ECM. You can follow it to the computer with a test light to see if you have power coming out of the ECM. You're mainly checking to see if the injector drivers are working. Also check the ignition module. The injectors get their signals from the ignition module to know when to fire.

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