No gas goes though the injector when turning over and no spark
SOURCE: GMC not starting first try. replaced starter.
Yes on the fuel pump, sounds like the system is bleeding off the fuel pressure, could also be the regulator.
SOURCE: 1990 gmc 6500 topkick with no spark or injector pulse
You are jumping to conclusions. Slow down.
No spark AND no injector pulse indicates none of the desired outputs were triggered. The ignition module makes spark when it receives a crankshaft position sensor signal, and then transfers control of that spark to the computer after it starts. The module takes its crank sensor signal and generates an RPM count that it forwards to the PCM(main computer) which is used for triggering the injectors and controlling timing. SO, if you had a bad crank sensor OR a bad ignition module, you could lose both spark AND fuel. a coil would not disable injector pulse. modules RARELY fail in a manner that disables RPM reference to the computer causing it to not fire the injectors...At this point, I would TEST the crank sensor as the next step. If its easier, 1 of the wires on the module goes directly there so you can test the crank sensor at the module.
Testimonial: "great info, thanks!"
SOURCE: OK 1997 gmc sierra 5.7liter 4x4 replaced coil and
Doesnt this engine use a crank position sensor? mounted on timing chain cover.I would check that first
SOURCE: what will cause a 5.7 2002 gmc savanna not to have
on that engine the crankshaft sensor sends a signal to the pcm to fire the coil the pcm then sends a ground pulse signal to the coil to fire if you check for 12 volts at the coil and it is there with the key turned to run. then use a 12 volt test light hooked up the alagator clip on the positive battery post and touch the probe end of the test light to the pulsing wire at the coil electrical connector white and black wire during cranking the test light should flash.also test pink wire at coil connector for 12 volt with dvom for power.if no 12 volt check fuses with the test light to ground on injector 1 fuse. also ohms test the coil wire no more than 1000 ohms per inch . also check ground at ign module with the test light .Hope this helps thunder boltz please post rating
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.
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