96 Chevy S-10

Tiny
J.STIEG
  • MEMBER
  • 1996 CHEVROLET S-10
  • 6 CYL
  • 2WD
  • AUTOMATIC
I am having a problem with a 96 Chevy S-10. It will crank but wont fire. It will start if I put gas down the carb and stay running. It will start once its warmed up. It will start up If I put amp booster on as well, but will consistantly fail to start when cold. What should I try first?
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Friday, November 19th, 2010 AT 11:18 PM

9 Replies

Tiny
RASMATAZ
  • MEMBER
Could be the ignition switch is failing

Crank and will not start-Do below and get back with some testing results:

Get a helper disconnect a sparkplug wire or 2 and ground it to the engine at least 3/16 away from ground -have helper crank engine over-do you have a snapping blue spark? If so-you have a fuel related problem, Do you hear the fuel pump come On when you turn key on? If not check fuel pump fuse and fuel pump relay if so, check the fuel pressure to rule out the fuel filter/fuel pump/pressure regulator and listen to the injector/s are they pulsing or hook up a noid light. No snapping blue spark continue to troubleshoot the ignition system-power input to the coil/coil packs, coil's resistances, distributor pick-up coil, ignition control module, cam and crank sensors and computer Note: If it doesn't apply disregard it.
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Friday, November 19th, 2010 AT 11:23 PM
Tiny
J.STIEG
  • MEMBER
I get a good long blue spark from several wires, and for the fuel system the tank is full, I can hear the fuel pump run, I get about 40 psi at rail, I back probed the fuel injectors and there is constant + voltage to each, along with ground pulse from PCM. I tested injectors for pulse with an LED and it blinks with engine cranking. It will start with gas or starter spray down throttle. What should I try/test next?
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Saturday, November 20th, 2010 AT 2:58 AM
Tiny
RASMATAZ
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Your fuel pressure is too low-4.3L 60-66psi(4.2-4.6)
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Monday, November 22nd, 2010 AT 9:26 AM
Tiny
J.STIEG
  • MEMBER
I did some more test, and when turning ignition the fuel pressure is 60psi with 40 amp booster on it before starting, and it starts dropping to 55psi once its running. Without the 40 amp booster it is 45 psi when turning ignition, and it will not start. Once it is running it runs good at 55to60 psi without booster. What should I try first in troubleshooting?
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Monday, November 22nd, 2010 AT 6:18 PM
Tiny
RASMATAZ
  • MEMBER
Consider replacing the fuel pump if the fuel pressure regulator and nut kit is not leaking also check the fuel filter
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Monday, November 22nd, 2010 AT 6:32 PM
Tiny
J.STIEG
  • MEMBER
Where is the the fuel pressure regulator and nut kit located?
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Monday, November 22nd, 2010 AT 8:25 PM
Tiny
RASMATAZ
  • MEMBER
Disregard the FPR and the Nut kit-you tested the injectors therefore its a TBI system-Where did you get your fuel pressure-The fuel pressure on a TBI is 9-13 psi? I'm confused here-whether it a a TBI or CPI Vortec
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Monday, November 22nd, 2010 AT 8:31 PM
Tiny
J.STIEG
  • MEMBER
It is a4.3 CPI Vortec. Before I started working on the truck the fuel pump, spider injectors, and the fuel filter had been replaced. It seems like there is something marginal with the fuel pump or power supply. Can I get a wiring diagram of the fuel pump circuit?
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Monday, November 22nd, 2010 AT 10:35 PM
Tiny
J.STIEG
  • MEMBER
I need a wiring diagram for 96 s10 4.3l.
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Saturday, November 27th, 2010 AT 9:10 PM

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