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Thread: 1460 problem after rebuild

  1. #1
    Brian4618 Guest

    Default 1460 problem after rebuild

    I have a holley 1460 that i bought a rebuild kit for. After putting it back together and bolting it on the engine (327), I cant get it to idle under 2000rpm. I have tried switching power valves and cant come up with any results. I know a vacuum leak could cause this but the engine itself does not have any vacuum leaks as it runs perfect with other carbs, so the problem is in the carb itself. Where are some common vacuum leaks on the carb I should check for?

  2. #2
    Join Date
    Dec 2009
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    Default

    Check the secondary throttle shaft for excessive opening.
    Also, ensure the idle speed screw isn't somehow stuck on the fast idle cam.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS T/W 11R 205 heads, 232°-244° duration/.623" lift/114° LSA camshaft, 12:1 C/R, TFS R-Series FTI ported intake, BBK 80mm T/B, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 200A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, -6AN fuel system plumbing, Walbro 255 LPH pump, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/3000 RPM converter, B&M Hammer shifter, FPP aluminum driveshaft, FPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 M/T Street Comp tires.

  3. #3

    Default

    Hello, new to the Holley forum. I'm having a similar problem with a Quick Fuel SS-750-AN (4150) after a tear down and reassembly. The carb is on my boat and has very few hours on it (not a worn out carb), but after 2 winters of sitting it required a good cleaning.

    During disassembly I did not touch the idle adjustment screw or any other adjustment screws except the 4 corner idle screws which were at 1-1/4 turns out and reset there.
    After the rebuild, upon startup it goes to what must be near wide open throttle? Throttle linkage checks out OK, butterflies are all closed, but still stays at a very high RPM. Everything went together just fine. Any ideas on what to look for? Thanks in advance.

  4. #4
    Join Date
    Jan 2010
    Location
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    Could you please start a new thread instead of adding to 8 year old threads in the future?
    Now everybody else gets to read this, and then gets to your subject.

    What engine, camshaft, compression, etc?
    What is "High RPM", and what have you done to attempt to slow it down?
    Is the throttle body to main body gasket correct?
    For the thousands of carbs I've built or rebuilt, I have not had an issue like this.
    Hopefully others will chime in. Gary
    Last edited by Gaz64; 05-19-2020 at 06:37 PM.
    Regards, Gary

  5. #5

    Default

    First, sorry to tick you off Gary. All the other forums I've ever been on get pissed when you start a new thread without first researching and using an existing thread on the same topic. Second, I have no idea what my engine specs have to do with a carb issue.

    Anyway, this morning I final took the carb back apart to verify everything was correct. Ah ha, here's the problem, the fast idle cam assembly was not over the end of the choke rod resulting in the the throttle being hung open when the throttle was opened and released.

    Well, this was maybe my 5th carb rebuild, I don't have thousands under my belt, but I have enough experience to know it was something in the carb reassembly and not the engine or gaskets.

    Big thanks to everybody on this forum for helping out.

  6. #6
    Join Date
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    Good to hear you found your issue. A torch down the throttle bores would have shown that one side was more open. And then the throttle stop screws. Gary
    Regards, Gary

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