1993 c1500 orig. v6 4.3 , now sporting a (new to me) 5.7 v8. had it running. new plugs, wires, computer, checked all the wires, vacuum hoses etc first time it was a fuse blown.started ran good, for 20 or30 killed it to run an errand 30 mins. now dead truck again. now same symptoms but the fuse is still good.injectors not spraying why??
Check the crank position sensor and the cam position sensors. When these go, they go without warning. Check for continuity across the connectors, should be less than 100 ohms.
SOURCE: 95 GMC Jimmy 4.3l W vin rough idle
My problem was solved when I repaired my 4 wd activation dash switch. The switch was contacting on 2WD & 4HI at the same time. The front differential activation is vacuum activated possibly creating a tug of war that didn't actually engage it but drained off vacuum from the engine? A theory at best but stumbbled across it because I knew the switch wasn't working properly I repaired it and low and behold rough idle disappeared and all is good for 3 weeks running.
SOURCE: cannot get 1987 chevy van 20 to keep running... stalls out
Best do a fuel pressure test. Should have chg. fuel filter from the get go. The only other filter is on the end of the fuel pump in tank. Bad gas and dirty gas will plug up fuel filter, hense burn pump up.
SOURCE: 1999 GMC Suburban 350 wont run
Per your description, it sounds like you are missing an injector pulse from the ECM.
Check the under-hood fuse box and verify the "ECM1" fuse is good (12 volt supply to injectors).
With the key in the run position, verify you have 12 volts at an injector.
Barrow or purchase a "noid" light to verify you have an injector ground pulse from the ECM.
Let me know what you find and we can proceed from there.
Regards,
SOURCE: GM TBI low voltage at the injectors
sounds like a computer issue on the burb, but i would check the IAC(idle air control) valve and the TPS(throttle position sensor) first.
I would start with the IAC on the 93'.
SOURCE: Hi ,I have a chevy blazer s-10 1993 and she won't
Find the pressure test port (looks like a tire valve) on the fuel distribution rail over the injectors and place a can over the open end of the valve. Press the inner pin to release fuel into the can. If the pressure seems to fall rapidly, replace the fuel filter. Is the check engine light on? Rent a scanner, read any code(s), and pursue to repair(s). A bad crankshaft sensor or camshaft sensor can prevent the injectors from firing fuel into the engine.
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Did you change out the ECM after changing the engine? The engine control module is proprietary to each individual motor.
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