Question about 1985 Chevrolet S-10

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1985 chevy s-10 2.5L no gas to injecter. replaced injector, ignition control module, rented a noid light system and there was no blinking from the noid light. Truck has plenty of pressure from the throttle body... truck will run just fine on starting fluid. what is our next step... Was told we should change the pick up coil? Can anyone help with this problem?

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  • 334 Answers

SOUNDS RIGHT THE PICK UP COIL CONTROLLS PULS SIGNAL FOR THE ECM TO FIRE INJECTORS , BEST MOVE WOULD BE TO REPLACE THE DISTBUTOR AS A UNIT.MAKE SURE YOU MARK EVERY THING SO YOU PUT IT BACK RIGHT

Posted on Oct 16, 2013

  • Crystal Hindman
    Crystal Hindman Oct 16, 2013

    Alright will change out the pick up coil... thank you ill let you know how it works.... :)

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6ya6ya
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Posted on Jan 02, 2017

mas66
  • 104 Answers

SOURCE: '88 chevy truck, no spray from injectors

Not sure on that model what controls the injector pulse, but most vehicles either use the signal from the crankshaft position sensor or a cam position sensor. You should use a LED testlight, (NOT A BULB TESTLIGHT!!) and backprobe the injector terminals (with the other lead of the testlight to ground) while cranking the engine over. If the light flashes on one of the terminals, then you are getting injector pulse, and the fault lies elsewhere. If not, then you will need to replace whatver sensor is used to provide engine position signal on that model. Also, check the wiring to that sensor. Some vehicles have problems with the crankshaft pulley harmonic balancer failing and damaging either the body of the crank position sensor or its wiring.

Posted on Nov 02, 2008

  • 10 Answers

SOURCE: Help w 1994 chevrolet truck

disconnect the batt. is your fuel pump running check fuse listen for it

Posted on May 28, 2009

  • 4088 Answers

SOURCE: 1987 chevy s10 2.5l tbi will not start. changed

That eliminates the crankshaft and camshaft position sensors. Have you checked the fuel injector itself for an open winding or stuck valve plunger? There should not be a steady 12 volts to the injector--if good injector, it would be spraying fuel steadily into the throttle body. But at least the engine should try to run if poorly. Take the injector out, dry it off with air, and intermittently apply 12 volts to one terminal while grounding the other. You should hear a click from inside every time you touch 12 volts. If not, replace it. If it does, it may be plugged with debris. Try blowing through it in reverse with compressed air.

Posted on Jul 17, 2009

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SOURCE: 90 chevy k1500 350 tbi fuel problem starts but wont stay running

try bypassing the oil pressure switch on the back of the block behind the distributor, if there oil pressure switch goes bad it will do this. had one that drove me nuts trying to fix it then figured out I had to buy a book and low and behold thee it was 3 wire oil pressure switch you can't see between the engine and fire wall just behind the distributor and costs 8 bucks to buy new.

Posted on Jan 16, 2010

roniecon
  • 6826 Answers

SOURCE: I have a 1988 Chev. 1500 Truck 350 motor. I have

Check the throttle position sensor with a ohm meter to see if it has a dead spot in it,and then there is the map sensor ,I think it is mounted on the passengers side valve cover,or the breather rectangle in shape and black in color,has one vacuum line going to it,and a three wire connector.Also check the fuel pressure regulator,it could be the problem,and make sure the return line to the fuel tank is clear,and not restricted.

Posted on Jun 04, 2010

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1986 chevy s10 2.5l no gas coming from injector. - S-10 Forum

www.s10forum.com/.../1986-chevy-s10-2-5l-no-gas-coming-from-inject...
Sep 2, 2009 - 24 posts - ‎7 authors I have no gas coming from my injector it a 1986 chevy s10 2.5l I have replaced the fuel pump,oil pressure switch & I checked and oil would ...

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First understand how the fuel injector circuit works that causes them to spray fuel out, then you could probably find the problem. It's really simple, the key thing is that the hot wire to the injector (there are only two, a power wire and a ground wire) is always hot anytime the ignition key is in on, or run, or start. It is a fused circuit that is powered on when the key is on. The fuse is either in the distribution box under the hood or in the instrument panel fuse block.

The ground wire from the injector goes into the computer where it can be internally grounded inside the pcm for a split second. This is what causes the "pulse" of the injector, a needle is raised electromagnetically, and fuel under pressure is sprayed out. The computer can vary the pulse width, by duration of ground time, and really fine tune the gas metering.

Check for power at the injector connector with key on. If nothing, check the injectors fuse, and trace it back to the ignition switch. If there is power on the hot wire, one way to further test the circuit is to go buy a cheap "noid light," a tester at any parts store-different sizes, but easy to find a standard for gm vehicles. A noid light checks power and ground wires at the same time. Now that you understand "pulse", a noid will blink as if it were being pulsed-well it is, just that. Hook it up to an injector connector, and the engine has to be cranking over-that is when the computer is grounding the circuit repeatedly-when the engine is running and when it is cranking by the starter. If the noid light blinks, the circuit is working correctly. If the light doesn't turn on at all, first verify that the power wire has power with key on. If it does, problem may be in the ground side of the circuit, or in the pcm itself.

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So, it's the injector circuit. There is a 10 amp injector fuse in the fuse block, on left side, 4th one down. Check this fuse. It supplies constant power to both injectors, on the red wire to injector 1, and a white wire splice from this to injector 2. A steady 12 volts anytime key is in on, run, or start. You can check this with a test light or voltmeter. Ground the test light and probe injector connector's red wire on injector 1, and the white wire on injector 2-both should be hot with key on.
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