Results 1 to 5 of 5

Thread: Stumbling and Dying

  1. #1

    Default Stumbling and Dying

    I'm really new to carburetion, so I'm desperately in need of some help. If someone could get me pointed in the right direction, I'd be really grateful. I have a 750 cfm Holley carb. I'm not sure what the model number is, but it's a double pumper and has an electric choke. Sometimes it will stumble on me when I accelerate, directly after shifting into the next gear up. By stumble, I mean like it hesitates for a second. Another issue I ran into was last night, when I accelerated hard and let off of the throttle, it just completely died on me. Any ideas?

  2. #2
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    22,893

    Default

    Quote Originally Posted by hatexworldxwide View Post
    Sometimes it will stumble on me when I accelerate, directly after shifting into the next gear up. By stumble, I mean like it hesitates for a second. Another issue I ran into was last night, when I accelerated hard and let off of the throttle, it just completely died on me. Any ideas?
    This is basic carburetor tuning. Watch these Holley/YouTube Installation & Tuning videos (Link) and purchase this Holley Installation & Tuning DVD (Link).
    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

    Default

    I appreciate the reply and thank you for the links. But if this is so basic, maybe someone could tell me which circuit I need to be tuning?

  4. #4
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    22,893

    Default

    Quote Originally Posted by hatexworldxwide View Post
    But if this is so basic, maybe someone could tell me which circuit I need to be tuning?
    There's at least two circuits that needs to be tuned.
    Accelerator pump circuit and the main metering circuit:
    http://www.holley.com/data/TechServi...ech%20Info.pdf (Holley Carburetor Fundamentals)
    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
    Join Date
    Jan 2013
    Location
    Constantine, MI
    Posts
    168

    Default

    My steps:
    1) Check accelerator clearance.
    2) Set idle.
    3) Check float level.
    4) Set rich/lean screws.
    Provided the timing & advance is correct, it's time to play with the nozzles, cams, jets and secondary springs, depending on what the motor needs and the type of performance desired.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
About us
Holley has been the undisputed leader in fuel systems for over 100 years. Holley carburetors have powered every NASCAR® Sprint® Cup team and nearly every NHRA® Pro–Stock champion for four decades. Now, Holley EFI is dominating the performance world as well as our products for GM's LS engine. Holley's products also include performance fuel pumps, intake manifolds & engine dress–up products for street performance, race and marine applications. As a single solution, or partnered with products from other Holley companies - Hooker Headers, Flowtech Headers, NOS Nitrous, Weiand, Earl's Performance Plumbing, or Diablosport - Holley products can give you the edge you need over the competition.
Join us