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Thread: SBF Heavy Flooding on No Start

  1. #1

    Default SBF Heavy Flooding on No Start

    I have a SBF with Holley HP, Victor EFI manifold, Holley 4150 throttle body, 42 lb/hr injectors. If the car doesn't start for some reason, and I have to crank it for very long, I get a ton of fuel out of the exhaust once it starts. I didn't think the injectors were active until a certain RPM on startup.

  2. #2

    Default

    Datalog it and see what's going on. Might also want to review your tune to verify all of the cranking and cold enrichment settings.

  3. #3
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    27,472

    Default

    Ensure all of this is right: http://forums.holley.com/showthread....ents-Read-This! (Initial Checks & Adjustments - Read This!)

    Overlay the datalog onto your Global File, and pay special attention to the center paragraph in blue print:
    Originally Posted by Danny Cabral
    Quick Datalogger Information:
    Always provide data, not just symptoms. Is the AFR & ignition timing optimized? Overlay the datalog onto your Global File.
    Ensure the Target A/F Ratio table is properly programmed for your engine. Ensure the ECU is "Learning" (Learn Table LINK).
    Scroll through the datalog to the problem area. Then look exactly where this happens on the Base Fuel & Timing Tables. Scrutinize:
    RPM, MAP, MAT, TPS, CTS, IAC, Target AFR, AFR Left, CL Comp, Ignition Timing, Duty Cycle, Fuel Flow, Fuel Pressure & Battery.

    Using the Holley EFI software (LINK), look at where the live cursor moves to during this occurrence, and
    manually tune that area of the Base Fuel Table (enrich or lean) & Base Timing Table (optimize ignition timing).


    I find the most helpful datalog function, is overlaying the datalog on your Global File.
    I'm in the habit of using the datalog Overlay feature every time I review a datalog.
    Click on "Datalog" (on the top Toolbar), "Activate Overlay", then "Open Data Log".
    You can literally "playback" a recorded event, and watch it as it happened on any screen.
    Minimize (shrink) the datalog window, and move it to the bottom of any Global File screen.
    Then click & scroll anywhere on the datalog, and watch it playback on your Global File (EFI software).
    http://documents.holley.com/techlibr...9r10543rev.pdf (Holley EFI Datalogger Instructions)
    https://forums.holley.com/showthread...s-amp-Datalogs (Datalog & System Log Information - Read "NOTES")
    https://www.youtube.com/watch?v=iqHO...C6FEA0BB99AF17 (How To Record & Email A Datalog)
    https://www.youtube.com/watch?v=q7OZUXLRS1Q (How To Record A System Log & Diagnose A No-Start Condition)
    https://forums.holley.com/showthread...7531#post77531 (Closed Loop Datalog Tuning - Posts #2, #4 & #6)
    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.

  4. #4

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    Quote Originally Posted by Jart View Post
    ...I get a ton of fuel out of the exhaust once it starts. I didn't think the injectors were active until a certain RPM on startup.
    Are you sure that isn't water vapor? Having water vapor on cold start up is pretty common. The ECU will inject whatever the cranking fuel amount is configured while you're cranking. If it isn't starting quickly, then you needs to tune your cold start. Andrew

  5. #5

    Default

    Thanks for the replies. I'm sure it's not water vapor. Just to clarify, It starts and runs fine right now. But if for some reason it doesn't start on the 1st try and you continue to crank it, I get a heavy flood situation. The problem showed up when my stock TFI setup went bad. Went to start it and would crank, but not fire (didn't know TFI was bad yet, have since installed Dual Sync and cured the no start). I continued to crank it with no luck starting it. After 7 or 8 tries it wouldn't crank anymore. Pulled a couple of spark plugs and several cylinders had fuel in them and #6 was full (that's why it wouldn't crank). Gonna go back through the tune, and have the injectors checked.
    Last edited by Jart; 11-02-2020 at 06:37 PM.

  6. #6

    Default

    @Jart: Sounds like you need to tune your Startup Enrichment parameters.

  7. #7
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    27,472

    Default

    If you take the time to study this, you'll be a startup tuning expert, and read the "TIP" in post #6:
    http://forums.holley.com/showthread....6254#post36254 (Good Starting Advice Thread - Especially posts #2, #4 & #6.)
    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.

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