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Engine skipping a beat

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Predator, Dec 12, 2001.

  1. Predator

    Predator 1/2 ton status

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    Alright, I can't figure this one out. I put the off-road kit in my Edelbrock carb and also replaced the intake and valve cover gaskets at the same time. Now, when I stab the gas it acts like it "skips a beat", then goes ahead and revs up. If I rev it up slow it does just fine. I've checked the vacuum ports, float levels, messed with the timing........I'm not 100% the timing is right on, but it starts and idles and runs up the rpms. I also took out all the plugs and reinstalled them after I got everything back together. Everything on the engine is 1K miles old. Any ideas??

    My K5 Buildup: <a target="_blank" href=http://www.geocities.com/gettin_deep>http://www.geocities.com/gettin_deep</a>
     
  2. DesertDueler

    DesertDueler 1/2 ton status

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    Its either staving for fuel when you hit it, or its getting too much. When you nail the throttle check to see if alot of black smoke comes out the pipes.

    86Jimmy 4"&35"MTRs,87 burb 4"&33"MT,69Firebird w/525 hp,and 70GTO live in PHX,AZ<a target="_blank" href=http://www.geocities.com/modifierperformance>My vehicles</a>
     
  3. Predator

    Predator 1/2 ton status

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    No black smoke....

    My K5 Buildup: <a target="_blank" href=http://www.geocities.com/gettin_deep>http://www.geocities.com/gettin_deep</a>
     
  4. hammer

    hammer 1/2 ton status

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    not sure about edelchoke carbs but on a holley there is a acellerator cam you can change to get the fuel faster or slower and you can change the cc of the pump to get more so it does't skip a beat when you floor it. the eldelbrock carb might be your problem what cfm is it and what is your engine size and upgrades

    <font color=red>Let me at it I can break it</font color=red>
     
  5. Predator

    Predator 1/2 ton status

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    It's a 600 carb., 350 engine, 30 over, cam, intake. It does have 3 settings on the pump arm. But it wasn't doing this before I put in the kit and changed the gaskets. Also, just went out and checked the fuel line at the carb...plenty of fuel pumping there.

    My K5 Buildup: <a target="_blank" href=http://www.geocities.com/gettin_deep>http://www.geocities.com/gettin_deep</a>
     
  6. hammer

    hammer 1/2 ton status

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    ok 600 is properly sized for your engine but you said didn't do it before you put in the kit and gaskets. Have you checked the engine with a vacume gauge eldebrock has 2 srews in the front of them you need to tune the carb to your engine, I believe one of the screws adjust the vacume for the advance for your timming you might just need to tune it up timming and carb to the preformance you want to get rid of the skip you have. Not enough vacume for the timming when you floor it for a second

    <font color=red>Let me at it I can break it</font color=red>
     
  7. DesertDueler

    DesertDueler 1/2 ton status

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    Sounds like the offroad kit is making the carb starve for fuel. Take it back apart and remove the kit and try again. If that solves it then you need to richen it up some.

    86Jimmy 4"&35"MTRs,87 burb 4"&33"MT,69Firebird w/525 hp,and 70GTO live in PHX,AZ<a target="_blank" href=http://www.geocities.com/modifierperformance>My vehicles</a>
     
  8. Predator

    Predator 1/2 ton status

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    OK, here's the update......tried changing the pump linkage to another hole. This cleared it up for the most part, however, according to the Edelbrock manual what I did was shorten the pump stroke. This is supposed to decrease pump delivery. What I don't understand is why would this needed to be adjusted now after just changing the bowl needles and seats? I took it for a drive for a few blocks and it still stumbled once after a stop (timing adjustment?). I remember running around 17 on the vacuum, but went to zero when I punch the gas. Is this right? Any other thoughts. Thanks.

    My K5 Buildup: <a target="_blank" href=http://www.geocities.com/gettin_deep>http://www.geocities.com/gettin_deep</a>
     

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