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1989 caprice with 350 tbi injectors won't pulse anymore

Car has new plugs new wires new dist cap rotor button ignition control module and even bought a new computer car ran great then injectors stopped working previous owner had the injector harness wired wrong had blue wire going to green and fried the connectors so I changed it car started injectors pulsed then nothing now they won't fire any suggestions will help gets fuel has a aftermarket electronic fuel pump anything will help everything's new

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  • Brandon Jan 18, 2013

    Yes I replaced all plugs wires and the injector wiring harness and the computer it started perfect for one day then back to nothing no pulse

  • Brandon Jan 18, 2013

    And no I don't have a full wiring diagram or manual for it yet

  • Brandon Jan 19, 2013

    Took your advise got a computer from pull and pay put it in gets spark gets fuel injectors still won't pulse should I be patient or just say screw it and convert it to carb spent a lot of money guessing what it might be

  •  Stephen
    Stephen Jan 19, 2013

    Well changing to a carb is no picnic since the intake is different and you have to come up with some kind of fuel pump arrangement. The fuel pressure for injectors will blast a carb. You said the replacement "gets injectors" - - if you unplug both injectors do you get a ground pulse from the computer ?

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  • Cars & Trucks Master
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If you have spark, the computer is getting the signal to pulse the injectors.
If you have power but no ground pulse, you may have fried the driver in the computer again.
You could get a used computer from a junk yard to test it.
There could be a short in one of the injectors or the harness at the computer, or a break in the circuit from the computer, and that could kill the driver in the computer.

Posted on Jan 19, 2013

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: 89 s10 2.5 has fuel and fire injector has power but no pulse

injector pulse is just controlled by the ecm or computer as some would say,u said u replaced wires? did u have a fire or melt wires? ecm is known to go bad on these,had a few of these trucks back in the day.

Posted on Feb 16, 2009

  • 15 Answers

SOURCE: 89 s10 has fuel fire everything fine except injector pulse

have you checked the wiring diagrams on the repair manual?

Posted on Feb 21, 2009

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