1983 Chevy S-10 Carburetor Problems?

Tiny
BROOKLIN
  • MEMBER
  • 1983 CHEVROLET S-10
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 242,000 MILES
Hi I recently got this truck and I was driving it for about 2 days before it choked out and died. From what I know now is the carb is a rebuilt ( not me who did it) and there was some vacuum issues that I already fixed, hoses replaced/ tighted. I thought it could be the fuel pump or filter, so I replaced the filter and tested the pump but the pump works good, however I think im going to put a new one in tommorow because it could be faulty. But it seems to still leave the problem of issues with the choke portion of the carb acting funny. The owner before me had the carb running really lean and im still playing with the adjustments on mix. I got advise that it could be still vacuum issues but there is so many possibilites its crazy. As it stands, three days ago I could drive the truck for about 5-10 min and it would choke out and giving it revs only delayed the stall. And when its hot I cant start it right away. Just today though the problem has got alot worse, barely starts and wont idle for long before dying. Is something clogged dirty? Where do I start?
Thursday, February 25th, 2010 AT 9:21 PM

3 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Hi brooklin, Welcome to 2carpros and TY for the donation

Could be loading up due to a stuck needle valve with the float system-check the fuel level in it, also choke plate initial opening and fast idle adjustment is out of whack. Overall here the choke might not be fully opening-If everything set perfectly it should open fully within 3 mins. And you don't have to play around with the gas pedal to keep it going.

Fuel pump could be still good if you hook a vacuum gauge and if it produces 3-5psi its still good
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Thursday, February 25th, 2010 AT 10:18 PM
Tiny
BROOKLIN
  • MEMBER
  • 3 POSTS
I adjusted the idle and the float level seems to be good. I replaced many vacuum hoses that were cracked/split. This seems to help. However, when I put my hand over the choke plate the engine doesnt want to die out, rather it runs higher! Does this indicate still a vacuum leak? The engine isnt looping so I believe the intake manifold is good. Is there somewhere else. I have thoroughly checked and tightened vacuum hoses so.

Another thing, could it be im in vapor lock? Is it worth replacing the fuel vapor canister?

Other than this im stumped. As of now, it idle good but after getting hot, I try to drive around the block and within 5-10 min it stalls out like its being starved for fuel. Feels exactly like I ran out of fuel. I did check fuel pressure and im pumping out 5-6 psi right into the carb.

The two things I am thinking is that its a inside carb adjustment problem or vapor lock.

The step by step guide is difficult to understand when it talks about how to check the fuel vapor canister. Can I disconnect the line from carb to fuel vapor canister to eliminate vapor lock ( to test)?
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Tuesday, March 2nd, 2010 AT 11:48 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
When I put my hand over the choke plate the engine doesnt want to die out, rather it runs higher! This is normal bcuz you're choking the venturi causing the the main nozzle to pull fuel.

Check for exhaust restriction and clean out the idle air control valve and EGR valve. Test the throttle position and manifold absolute pressure sensors.
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Friday, March 5th, 2010 AT 11:30 PM

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