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1991 Chevy S-10 Throttle Body Injection Problem

Tiny
KEITH_1961
  • MEMBER
  • 1991 CHEVROLET S-10
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 190,000 MILES
I need some help figuring out a starting problem. The only way I can start the engine is to pour a little gas in throttle body. I have replaced the following parts:
Fuel Sending Unit/Fuel pump, fuel relay, fuel pressure regulator, all vacuum lines, in line fuel filter, checked fuel lines.
After I prime, it starts and runs fine most of the time. Occasionally it will run either high or very low at idle. Other than that it runs good, gets good gas mileage. What am I missing?
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Thursday, August 21st, 2008 AT 10:17 PM

1 Reply

Tiny
MMPRINCE4000
  • MECHANIC
  • 8,548 POSTS
I would observe the injectors when starting to see if they are spraying fuel, if not then the injectors are bad or the wiring to them, or the ECM.

Also check the timing, assuming all the vacuum lines are intact, the high/low idle could be a timing issue.

Also if the ECM does not see an ignition pulse, it will cut off the fuel to the injectors.
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Friday, August 22nd, 2008 AT 4:24 AM

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