Chevy not starting

Asked by Jun 02, 2017 at 10:46 PM about the 1990 Chevrolet C/K 1500 Silverado 4WD

Question type: Maintenance & Repair

My 1990 chevorlet silverado k1500  will turn over
all day long but will not start! I got copression,
spark, but its not spitting fuel out the throttle body!
Iver replaced: fuel pump, pump relay, distributor
sensors, oil pressure sending unit... im stuck and i
need my truck running asap

3 Answers

21,085

Typically to get the injectors to open is they're powered by the main fuel injection relay, this provides positive battery voltage, then the ecu triggers them to earth/ground to complete the circuit. So first check for you is for 12v at the injector plug harness. Easiest test for this is with a noid light, handy little things, get them at Ebay. Unplug an injector plug, plug the noid light into the harness and crank it over, if you can see a little light pulse in the noid then the injection trigger is working if not then the injection relay or ECM is bad or wire harness or grounds, fuses ect.

Thanks for the help, i figured it out! I had a short to ground on the wire running to my smog pump.. it was laying on the exhaust manifold go figure... after all the money i spent, it was a free fix!

21,085

Glad its fixed.

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