Question about 1993 GMC Sierra K1500

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I have a 93 gmc k1500 with a 350. ive replaced the distributor and the fuel pump. the throttle body has been replaced also but my injectors will not spray. bad ecm??

When i replaced the distributor i noticed a "clicking" sound when i turned it to set the timing and the injectors sprayed. the motor was off and the key was on. she was too far out of timing to start. but after i tightened down the distributor the injectors would not spray. i had a problem in the past with the distributor not grounding but that has been fixed. all thats left now is the ecm right?

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  • elias_jake
    elias_jake Mar 05, 2012

    when i replaced the distributor i bought it new and had the ignition module tested, it came back good. so all that leaves is the ecm

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  • GMC Master
  • 1,413 Answers

Check at injector wire with a test anoid light blinking while cranking engine if there is a signal to the injectors.
The + signal is from a FUSE.
and the - signal is from the ECM.
If it's an ECM problem, before changing it. Check all positive and ground at ECM pinout check.

Hope it helps.

Posted on Feb 18, 2019

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6 Suggested Answers

6ya6ya

6ya staff

  • 2 Answers

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Posted on Jan 02, 2017

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jagjeffery

Jeffery Lewis

  • 329 Answers

SOURCE: throttle body injectors not fiering but there is fuel pressure

the injectors are fired thru the engine cotrol module but it gets its signal to fire from the pick-up located inside the distributor if you are loosing injector pulse only the ignition module is bad if you are also loosing spark when you loose injector pulse your pick up is causing the problem if you replace the pick-up i recomend you change the ignition module when doing so because they work together and you have to remove the distributor to change the pick-up

Posted on May 31, 2009

dmsr63

Douglas Hansen

  • 2050 Answers

SOURCE: Fuel injectors not getting power (1990 GMC Jimmy 4.3L)

Computer maybe, but it's not the most common failure. There is a hall switch and a "pole piece" on the shaft of the distributor just under the rotor. The ignition module just to the side of them usually affects spark. Sometimes it's easier to swap the distributor assembly if you know the procedure.

Posted on Sep 03, 2009

Testimonial: "Thanks alot man, really helpful for sure!"

Zaraki

  • 834 Answers

SOURCE: Truck will turn over but not start. Checked fuel

The ignition module located inside of the distributor is what generates the signal that the ECM (Engine Control Module) uses to time and fire the fuel injectors, as well as the signal to run the fuel pump and the dwell signal timing to fire the ignition coil. A faulty ignition module can cause any one of these systems to malfunction.

That does sound like a malfunction with the ignition module inside of the distributor, and you can remove the ignition module and have it tested for free at most auto part stores.

If you do purchase a new ignition module be sure that it does come with a silicone grease or a die-electric compound because it is a heat sink and the ignition module will burn up without it.

To install the new ignition module first clean out the mounting surface inside of the distributor. Then completely coat the metal contact surface under the ignition module with a thick coat the silicone grease or die-electric compound and do not leave any of the metal contact surface of the ignition module un-coated with the silicone grease or die-electric compound, and be very careful not to over-tighten the ignition module or it will be damaged.

Posted on Jun 22, 2010

camojoe

  • 1 Answer

SOURCE: 1994 gmc seirra k1500 4.3 engine 4x4 hesitation

Possible erratic signal from the crank sensor

Posted on Jul 31, 2010

johnpainter

  • 88 Answers

SOURCE: 1998 gmc k1500 random misfires

There is more than just ignition that could be the issue, including fuel injectors and EGR. Try this link to see if you get more ideas:

http://www.engine-light-help.com/P0300-check-engine-light.html

Posted on Nov 26, 2010

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