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Chevy 88 Astro van V6

Tiny
BMOLLAT1
  • MEMBER
  • 1988 CHEVROLET ASTRO
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 164,500 MILES
Hello, I have a 1988 chevy astro van v6 and it has been running rough on idle and when I step on the gas it rev's but then dies out, I, changed cap rotor n plugs on it and air cleaner, it runs smoother, still rough though and still when I step on the gas the motor revs then cuts out, tried advancing and retarding timing, helped slightly but still it will not run at a constant rpm, at one speed. I have to slightly feather the gas pedal. Also no fuel injectors, I see a carb on it, looked for the air/fuel mixture and wanted to reset but did not see any, are they inside the barrels of the carb? Any suggestions?
Merry christmas!
Bryan
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Monday, December 13th, 2010 AT 12:48 AM

1 Reply

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Those carbs have a littlevalve that controls anotherone thattrys to adjust the mix. Probably what is wrongis that the alcohol in todays fuel has wrecked the accelerator pump plus it being a rochester it may have a vacuum leak creating your problem. Make sure all your fuel filters and fuel pressure is ok though. This may have a tbi unit that looks similar to a carb. The connections on top of the injectors lose contact and the gasket below the tbi unit blows so it causes a vacuum leak as well. Try those by spraying choke cleaner on the bottom of the carb/tbi. If the rpm changes then it's got a blown gasket.
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Monday, December 13th, 2010 AT 1:05 AM

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