Question about 1991 Chevrolet Caprice

2 Answers

Injectors will not spray

My injectors are not opening i have changed the injectors and the ign madlue. pluse the fuel pump and relay the fuse and the fuses on the iner door jam. fuel is making it up to the injectors but it just will not come out and i got a new ecm put in it to. do eney no what the heck is going on. on the pressure is good all the way up to the injectors

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  • keith tucker
    keith tucker Apr 22, 2009

    i just buy this ecm monday and it work find in my friend 91 caprice but when i put it in mine nothing. so i took it back got a nother one a still nothing o and what fuse is it my friend

  • keith tucker
    keith tucker Apr 22, 2009

    no i dont but i did check the voltage i hock a wire to the - part of the injector to the frame and the + side of the injector to this voltage reader i have and it get power like that. but if i hock up both of the wires to the injector wires from the reader nothing. do i have a bad grond or is it somthing elsa

  • keith tucker
    keith tucker Apr 23, 2009

    witch prom is it do in the computer i have one hole bundole of wires going to the ecm and when i look in side the ecm the all prom are all there but is that why i dont get a pulse or somthing.

  • keith tucker
    keith tucker Apr 23, 2009

    do u know were i can get a diagram from for the injector wires and i may go get some more injectors i got them from the junk yard you know good but low cost place to go

  • keith tucker
    keith tucker Apr 24, 2009

    ok here is a nother problem how the hell i lower the pressure to my injectors i keep blowing the injector mount the shell that holds the two injectors in it.or the pressure is just to great and the injectors not openen so its just blowing that up. and how do you get water out the engine. that was the problem do thank the computer chip in side it. thank you

  • Anonymous May 10, 2009

    no pulse to injectors for a 92 caprice I have changed fuel pump relays, fuel pump, injector connectors, rebuilt pressure regulator, tested with noid light no pulse, changed distribitor three times, i'm lost did you fix your problem



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There is a fuse for the injectors check voltage at the injector it should read battery voltage.or your prom is bad in the computer.

Posted on Apr 21, 2009

  • 2 more comments 
  • mike loshbough
    mike loshbough Apr 22, 2009

    due you have a test light if so turn key on and start checking them .also check for voltage at the injector.

  • mike loshbough
    mike loshbough Apr 22, 2009

    you should have power then ground is supplied by your quad driver in the may have wiring issues!

  • mike loshbough
    mike loshbough Apr 22, 2009

    did you change the prom in the computer or take it out of the old one?

  • mike loshbough
    mike loshbough Apr 23, 2009

    try autozone for the wiring diagram. the prom is a chip under the cover of the does not come with a new computer.


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Check the wire from ecm to injectors for sure burnt from the exehust line you will found a hidden burn cut

Posted on Mar 22, 2010


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