Carb problems: Rochester Quadrajet
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5.0 and 5.7 Discussion, Carb problems: Rochester Quadrajet in Cadillac Engine Technical Discussion; i have an 87 fleetwood brougham and have been dealing with carb problems for months. it actually left me stranded ...
  1. #1
    BEOWOLF's Avatar
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    Carb problems: Rochester Quadrajet

    i have an 87 fleetwood brougham and have been dealing with carb problems for months. it actually left me stranded and i had to park it until i could get the money up to fix it. the carb was dumping too much fuel. i was quoted $600 for a refurbished carb, i thought that was too high, so i had mine rebuilt, by my father in law...but it has still been hell trying to get it tuned just right. anyone else had trouble with these carbs???

    suggestions on the best permanent fix?

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    BluEyes's Avatar
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    Re: Carb problems: Rochester Quadrajet

    Get the Doug Roe book on Rochester Carburetors. There's also some good info out on the net on setting up and tuning Q-jets. Do a search in the 368/472/500 forum, I posted some info there about Q-jets awhile ago.

    What problems are you having with the carb specifically?

  4. #3
    N0DIH's Avatar
    N0DIH is offline Cadillac Owners Master
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    Re: Carb problems: Rochester Quadrajet

    Dumping fuel, look to the float, these commonly go bad when old. Is there a fuel filter installed in the housing? If some dirt came by and got lodged in the needle/seat? Is the M/C solenoid clicking when it is running? Is the ECM working?

    Then clean it, gumout is preffered, be careful with Walmart brand carb cleaner, although cheap, it strips the gold coatings off the carb. Very harsh. Clean all orifices and passages when it is on the car. Often that is all that is needed.

    Q-Jets are not hard to rebuild. Attention to detail on them is key. Clean clean clean. If there is dirt in a passage, it will screw up the air metering, but not enough to DUMP fuel.

    I have some good mods for q-jets on one of the forums (probably here), but do not attempt until the carb is running perfect.

    that book from Doug Roe is aweseome. Must have.

  5. #4
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    Re: Carb problems: Rochester Quadrajet

    If the fuel filter needs a change you smell gas? Does a dirty fuel filter affect performace?

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    Re: Carb problems: Rochester Quadrajet


  7. #6
    N0DIH's Avatar
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    Re: Carb problems: Rochester Quadrajet

    It will smell if there is a leak, that is bad, be very careful. Look for the leak and fix it.

    A plugged filter will cause the engine to be lean, killing off power and raising emissions.

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    Re: Carb problems: Rochester Quadrajet


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    Re: Carb problems: Rochester Quadrajet

    You can buy a rebuilt carb from various companies (forgot the name) for about $350. That is your best bet. A couple family members did that as well as Dope, much better then trying to mess with yours if you are not familer with it.

  10. #9
    fullserviceman is offline Cadillac Owners Fanatic
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    Re: Carb problems: Rochester Quadrajet

    rockauto.com has em for $400 ish and I think advance auto has them for about $350. I always had trouble with the floats sticking and dumping fuel so much that it was in the oil. Doesn't take much dirt to hang those up.

  11. #10
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    Re: Carb problems: Rochester Quadrajet

    thanks for all the help peoples. this should set me straight. i have been driving it around now...but every once in a while...after it gets up to operating temp...it will just die on me, and make it real hard to restart...once i do, it runs like ass unless i let it sit for a while. then we do that tango all over again. i will fix this damn it...at least she's rollin'.

  12. #11
    N0DIH's Avatar
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    Re: Carb problems: Rochester Quadrajet

    Make sure you are not fighting the EVAP emissions system allowing fuel in the bowl vent or the purge line.

  13. #12
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    Re: Carb problems: Rochester Quadrajet

    I bought few carbs from http://recarbco.com/ - remanufactured and adjusted to factory specs. And prices are reasonable too (67 Eldo - $200, 69 Deville - $240 etc)

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    Re: Carb problems: Rochester Quadrajet

    Hey man
    Is the car doing any better?

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