Question about 1987 Chevrolet S-10 Pickup

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My 87 blazer died, changed fuel pump,rebuilt tbi. I have 1.2 ohms resistance on each injector. I'm getting no power to injector, changed pcm and still no power. Don't know what to check next.

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  • todd jones
    todd jones Jan 06, 2014

    Had a similar problem not long ago,turns out it needed an extra ground cable attached to the quqrter panel and engine.sometimes ground points go bad mainly by corrosion and will be hidden from view.

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  • 194 Answers

Before you start self repairing, you really should by a manual with proper diagrams to prevent heading in wrong directions.
The PCM doesnt control injector POWER. It controls injector GROUND. The POWER comes from the ignition switch and goes thru a fuse in teh fusebox probably marked ECM1 or ECMa. If you have power at both sides of that fuse with the ignition key in the ON position, then you have a broken wire between the fuse and the TBI. If you have no power to that fuse, you may have a broken wire, blown fuse, or defective ignition switch.

Posted on Oct 04, 2009

Testimonial: "Thanks For info. Had A broke wire at fuse panel. repaired wire and blazer started right up. Thanks Again."

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It stalls an fire's right up or do you have wait any time ? What does the socket the relay plugs into look like ? Burnt at all ? High resistance causes heat ! Corrosion , loose fitting connections are resistance . The Ignition 1 relay powers up the PCM , fuel injectors an someother thing's . You could have shorted injectors , a problem with the PCM .Does the check engine light come on when you turn on the vehicle ? What engine is in it ? Do you know how to test resistance with a ohm meter ? test the injectors . There are videos on youtube showing how too. Test the power an grounds to the PCM - engine computer . Here is a web site for free wiring diagrams .
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Determin if the injector operating:
  1. disconnect the injector electrical connector and measure the resistance of each injector with an ohmmeter. Compare the measurement with the resistance value Specifications are 11 to 18 ohms.
  2. Replace any injector whose resistance value does not fall within the specifications.
If the injector was not operating but the resistance reading was within specifications, the PCM Powertrain Control Module (PCM) or the circuit to the injector may be faulty.

Check the ignition fuse located in the engine compartment fuse center. Also. check the fuel pump relay.
Note: The fuel pump relay is located behind the radio in the center of the instrument panel.

If the relays are good and the fuel pump does not operate. check the fuel pump circuit. If the wiring and the connectors are
good, replace the fuel pump.

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