Question about 1988 Chevrolet K1500
New fuel pump installed earlier. still runs great. plenty of gas up to the throttle body (disconnected the fuel line to see). installed new ignition module, new throttle positioning sensor, and swapped out the ECM from another truck that fires up. getting no voltage to the injectors(what voltage should be present anyway?) the truck died out on me on the road, I first thought that I ran out of gas. had to have it towed home. help!!
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
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