94 Chevy starting issue

Tiny
CHASOSKER
  • MEMBER
  • 1994 CHEVROLET SILVERADO
  • V8
  • 4WD
  • AUTOMATIC
  • 260,000 MILES
My 94 chevy pick up, 350, V8, 5.7 will not start without a shot of ether and my transmission will not shift gears. I have rebuilt/replaced just about everything! What am I missing? Please help!
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Saturday, November 13th, 2010 AT 1:50 PM

2 Replies

Tiny
KHLOW2008
  • EXPERT
Are there any trouble codes?
What are the components that you have replaced?

Perform the following and see if you can come up with anything.

Fuel System (TBI)

1. Before checking fuel system for a no-start condition, check ignition for adequate spark. Check for proper fuel pump pressure (9-13 psi) and capacity (one pint in 30 seconds).

2. Crank engine, and watch for injector spray. If injector spray occurs, go to step 5). If no spray occurs, disconnect injector harness. Check for battery voltage at harness with ignition on. Battery voltage should be present on one injector terminal. If battery voltage is not present, check for blown injector power fuse. If battery voltage is present on both terminals, check for wires shorted together.

3. If battery voltage is present on only one terminal, connect injector test light to injector harness. Crank engine, and note light. If light flashes, check for stored ECM codes. If light does not flash, momentarily touch test light from battery voltage to ECM RPM reference terminal (circuit No. 430 - Purple/White wire).

4. Each time test light is removed from ECM RPM reference terminal, injector test light should flash. If test light does not flash, check for open in RPM reference wire or injector drive (ground) circuit. If wiring is okay, replace faulty ECM. Before replacing ECM, check ECM power and ground circuits.

5. Disconnect injector harness, and crank engine. If injector spray or leakage occurs, a no-start condition may be caused by excessive fuel being delivered during cranking. Repair faulty injector or injector seal.
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Saturday, November 13th, 2010 AT 3:30 PM
Tiny
CHASOSKER
  • MEMBER
Thank you for your response!
The only trouble code that came up was a computer code. I have replaced the computer twice now and I'm still having the same problems. I have replaced the diaphragm and spring, fuel pump, filter, and all new gas lines. The throttle body was thoroughly cleaned, and the injectors are working fine. I also recently replaced the oil pressure switch, and the fuel pump relay. Once I shoot the ether the truck seems to run fine except it idles high, jumps when I put it in drive and will only shift to 2nd if it do it manually. I love this truck and am truly stumped. I keep thinking it is an electrical problem, could there be another computer in my truck that needs to work in harmony with the one I just replaced in my glove box? And for the record I replaced the head gaskets and every sensor I could think of about six months ago and everything seemed fine until I washed my engine. Then I started replacing all the fuel components but seem to be missing something.
Thanks in advance.I really appreciate any help!
Chas
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Saturday, November 13th, 2010 AT 3:54 PM

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