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Thread: Won't Idle Dual Carb Setup

  1. #1
    4rsfvr Guest

    Default Won't Idle Dual Carb Setup

    289ci with tunnel ram and dual carb #9776, 450 cfm each.

    Starts up fine but won't idle low or high rpm.
    Need to keep giving it gas to keep it running.
    So far, checked float level - OK.

    What to look for? Thanks in advance

  2. #2
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    Quote Originally Posted by 4rsfvr View Post
    ...wont idle low or high RPM. Need to keep giving it gas to keep it running.
    So far checked float level, OK. What to look for?
    Is it too rich or too lean?
    I highly suggest you invest in a wideband O2 sensor kit:
    https://www.holley.com/products/fuel.../parts/534-201
    http://documents.holley.com/199r10485rev1.pdf
    Otherwise, you'll drive yourself crazy questioning which direction to tune.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS TW 11R 205 heads, 11.8:1 comp, TFS R-Series intake, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 160A 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, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, M4602G aluminum driveshaft, FRPP 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 tires.

  3. #3
    4rsfvr Guest

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    My buddy, I think, has a innovate LM-1 sensor with a connection to the tailpipe to read air/fuel. Would this work?

  4. #4
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    Quote Originally Posted by 4rsfvr View Post
    My buddy I think has a Innovate LM-1 sensor with a connection to the tailpipe to read air/fuel. Would this work?
    Yes, that will read & display air/fuel ratio.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS TW 11R 205 heads, 11.8:1 comp, TFS R-Series intake, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 160A 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, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, M4602G aluminum driveshaft, FRPP 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 tires.

  5. #5
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    I find it interesting that if you go to the main Holley web site and search for '9776' you get no results. They are not in the catalog either. It's like Holley doesn't acknowledge their existence.

  6. #6
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    Quote Originally Posted by markw View Post
    I find it interesting that if you go to the main Holley web site and search for '9776' you get no results.
    They are not in the catalog either. It's like Holley doesn't acknowledge their existence.
    Type "9776" in these document's search bar, and you'll get the carburetor's specifications:
    http://www.holley.com/data/TechServi...%20Listing.pdf

    Spec Manual for 2010, 2300, 4010, 4011, 4150, 4160, 4165, 4175, 4500 carburetors:
    http://www.holley.com/data/Products/...99R10015-1.pdf
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS TW 11R 205 heads, 11.8:1 comp, TFS R-Series intake, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 160A 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, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, M4602G aluminum driveshaft, FRPP 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 tires.

  7. #7
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    Why don't the 9776 carbs show up on the regular Holley website? If I go to Holley.com and open the search bar at the top right of the screen and enter 9776 I get nothing. If I type 3310 or 4779 or any other carb number that's currently sold I get a catalog page with a picture, instructions, parts and rebuild kit numbers, etc. Seems like these things are like the crazy uncle nobody likes to talk about.

  8. #8
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    Quote Originally Posted by markw View Post
    Why don't the 9776 carbs show up on the regular Holley website?
    I don't know...maybe there's a superseded number or something.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS TW 11R 205 heads, 11.8:1 comp, TFS R-Series intake, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 160A 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, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, M4602G aluminum driveshaft, FRPP 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 tires.

  9. #9
    4rsfvr Guest

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    OK. So far, figured out that I need to pour gas into carb for it to stay on. What to check for?

  10. #10
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    Quote Originally Posted by 4rsfvr View Post
    OK. So far, figured out that I need to pour gas into carb for it to stay on. What to check for?
    That sounds like the carburetor is idling too lean.
    What did the wideband O2 sensor indicate?
    Have you tried adjusting the idle mixture screws:
    http://www.youtube.com/watch?v=UPGLU...7BFF0&index=10 (Holley Tech - "Idle Mixture Screws" video)
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS TW 11R 205 heads, 11.8:1 comp, TFS R-Series intake, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 160A 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, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, M4602G aluminum driveshaft, FRPP 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 tires.

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