Weird rev

Discussion in 'Troubleshooting & Diagnosis' started by Jerry M, Oct 13, 2020.

  1. Jerry M

    Jerry M Member

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    Hello, I was at the car the other day and started it up and revved it a few times because why not. When just pumping the gas quick, the engine seemed to skip a beat and stop for a second. Is this anything to be worried about? It doesn’t do it when I smooth into the rev a little better, this only happens when just stabbing the pedal for a split second. If this is an issue how do i fix it? Is it a timing problem?

    attached (hopefully) is a video of the car revving, the first couple times you can hear it skip a beat, the last few it sounds better by smoothing the push instead of just stabbing the pedal.
     
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  2. Coadster32

    Coadster32 Veteran Member Lifetime Gold Member

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    Could be carb related as well. Accelerator pump comes to mind.
     
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  3. Robert stuart Bell

    Robert stuart Bell Rsb78LT

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    how old is the gas in it?
    could be a few things, the accelerator pump diaphragm and other gaskets tend to swell up or dry out if not in use or it could also be an electrical connection in the ignition, a loose or dirty plug or ground could cause this as well, I've even had the coil go bad just from sitting
     
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  4. carhead22000

    carhead22000 oldblue

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    let your car come up to temp.then try.like stated could be lots of stuff. Will do it cold though 4sure.
     
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  5. TTR230

    TTR230 Veteran Member

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    This. skunky gas won't help either.
     
    Last edited: Oct 13, 2020
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  6. Jerry M

    Jerry M Member

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    Gas is new, filled the tank maybe 2-3 weeks ago, I haven’t rebuilt the carb myself but if I remember correctly some investigating showed it had been rebuilt previously as it has nylon needle and seats (edelbrock 1406 performer) It could also be that I have the accelerator pump set to much, might try putting it on a different level
     
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  7. Coadster32

    Coadster32 Veteran Member Lifetime Gold Member

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    Easy to adjust the cam on the accel pump on that carb, (I have the same one). Definitely warm it up, then take the air cleaner off and make certain the choke is off all the way. This could give you what you are hearing as well. Easy checks before you dive in any further.:bowtie:
     
  8. Rene Melten

    Rene Melten Veteran Member Lifetime Gold Member

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    I have to agree on making sure it's warmed up, mine does the same if I accidentally kick the choke off.
     
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  9. COPO

    COPO Veteran Member Lifetime Gold Member

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    It’s your carb. Warm or cold, it should not skip like that.
     
  10. TTR230

    TTR230 Veteran Member

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    Mine carburates perfectly when up to temp. Skips like that cold. I have no choke though.
     
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