Olds 403 Second Gear Power Loss

Discussion in 'Troubleshooting & Diagnosis' started by Smiles 79, Aug 17, 2020.

  1. CorkyE

    CorkyE Veteran Member Lifetime Gold Member

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    Yes it will.
     
  2. frank5s

    frank5s Veteran Member

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    The olds fuel pump run off a eccentric on camshaft
     
    Last edited: Aug 18, 2020
  3. mallard

    mallard Veteran Member

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    I read your other post about fuel pump pressure. Although the OP has a new fuel pump on his car I think you're right, he should be checking pump pressure in case that sock is in fact plugged. Forty plus year old car and all....
     
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  4. berg2695

    berg2695 Veteran Member

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    Have someone drive behind you to see if there is visible smoke from an over-rich condition when this problem occurs.
     
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  5. CorkyE

    CorkyE Veteran Member Lifetime Gold Member

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    It's not a common problem but the cam or the shaft could be worn. Road Kill had a worn shaft.

    A fuel pressure gauge will certainly be revealing.
     
  6. INSPECTOR57

    INSPECTOR57 Veteran Member Lifetime Gold Member

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    You say that you've disconnected the charcoal canister & plugged the port at the carb - you didn't cap of the vent line from the canister to the tank did you?
    If the tank is not vented it will cause an issue like you're describing.

    Gary
     
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  7. RxRmechanic

    RxRmechanic Member

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    The sock is probably a good place to start if not for anything else then for maintenance sake. It is over 40 years old. It's good to get intimate with your ride. If the bird ever sat for an extended period of time, I'd imagine it'll become apparent once you look inside the tank. Either way, I guess there's only one way to find out. Off the subject... How come you can take a currently 15 year old car, and rubber hoses, etc can still look as good as new in most cases? However, when you dove into ANYTHING from the 70's prior at about the same age (say 10-15 years old) then everything rubber around the tank basically fell apart to dust right in your hands or was petrified? Oh well.. I don't know. Probably just a Mid Atlantic thing. New York like winters and Louisiana like humid summers. Hope you get her straight, I'll lurk to find what you found.
     
  8. frank5s

    frank5s Veteran Member

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    The olds motor has a part that bolts to the end of camshaft, look like a freeze plug that is out of round,
    the fuel pump lever rides on the freeze plug like eccentric

    https://www.autopartsdb.net/assets/images/ProductImg/T/TA4005.JPG
     
  9. CorkyE

    CorkyE Veteran Member Lifetime Gold Member

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  10. 351maverick

    351maverick full time Ebay seller/hustler/car killer

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    vacuum leak on the transmission side...the modulator or something in there

    if it pulls hard in first gear, runs fine in first but Fs up in 2nd the trans has to be causing the issue
     

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