Question about 1985 Chevrolet S-10
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Posted on Jan 02, 2017
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
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
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
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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