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Thread: One bank LS not working.

  1. #1

    Default One bank LS not working.

    Just got to the point of startup of my LS 5.3L swap into my 56' Chevy. Car is only running on four cylinders. It's like the injectors aren't firing on the driver's bank. Pulled plugs and made sure spark was occuring. Plugs look new with no fuel smell. I have +12V power at the injector plug when key on and pump priming, and when in starting mode. Could I really have four bad injectors (all exhaust ports are cold that side and all plugs look new), or is there another issue?

  2. #2
    Join Date
    Dec 2009


    There's +12V, but disconnect the fuel injectors and see if the ECU pulses the ground side of the injectors when cranking. (System Relay & Injector Wiring Troubleshooting)
    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


    Comparing cylinder #1 (not running) to cylinder #2 (#2 is known to be running right now), they appear to both pulse 2.3-3V on the ground side.

  4. #4


    Quote Originally Posted by RedBaron15 View Post
    Comparing cylinder #1 (not running) to cylinder #2 (#2 is known to be running right now), they appear to both pulse 2.3-3V on the ground side.
    You can swap injectors from side to side and see if the issue follows the injectors. Andrew
    IG @projectgattago
    I offer remote Holley EFI tuning.
    I deliver what EFI promises.
    Please get in touch if I can be of service.

  5. #5


    Good idea! I'll give that a try first. Thank you.

  6. #6


    UPDATE: It was five bad injectors! Replaced that side and one in #3 and we have a runner! Thanks for the advice!

  7. #7


    It's always good to find a "smoking gun!" If I can be of service with the tuning, please let me know. Andrew

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