Results 1 to 2 of 2

Thread: Useful Sniper EFI Information

  1. #1

    Default Useful Sniper EFI Information

    Sniper EFI Specific Tech Videos
    Video on Installing a MSD Magnetic Distributor with Timing Control: Magnetic Distributor with Timing Control Install
    Installing a Holley Dual Sync Distributor with Timing Control: Holley Dual Sync with Timing Control Install
    Datalogging with Sniper EFI: Datalogging with Sniper EFI
    Updating firmware for Sniper EFI: Holley Sniper EFI Firmware Update

    Here's a link to some flow charts to help Troubleshoot your Sniper EFI: Troubleshooting Guide

    It's important to note that the Sniper EFI system will not fix an engine that's not mechanically sound.
    If the engine has mechanical issues, those need to be addressed before installing & troubleshooting the Sniper EFI.

    Below are also some helpful Holley EFI videos to prevent some of the common installation errors Holley Tech sees often with the Sniper EFI.
    The videos use HP & Dominator ECUs in the examples, however, the content applies to the Sniper EFI as well.

    Holley EFI Video on Potential Problems: Potential Install Problems
    Holley EFI Video on Bad Wiring Practices: Bad Wiring Practices
    Holley EFI Video on Protecting Wiring Properly: Protecting Wiring Properly (Pay specific attention to the WBO2 sensor cable routing from hazards, such as the exhaust and moving parts.)
    Last edited by Matt; Today at 09:05 AM.

  2. #2
    Join Date
    Dec 2009

    Default (Sniper EFI Software & Holley 558-443 CAN/USB Dongle) (Sniper EFI 3.5" TSLCD & ECU Firmware Update Info) (Holley Sniper EFI 2300 2BBL Quick Start Guide) (Holley Sniper EFI 2300 2BBL Instruction Manual) (Holley Sniper EFI Quick Start Manual) (Holley Sniper EFI Instruction Manual) (Holley Sniper EFI Help File) (Holley Sniper EFI Troubleshooting Guide) (Holley Sniper EFI 3.5" TSLCD Connector Disconnect) (Holley Sniper EFI RFI Issues)! (Holley Sniper EFI High Idle Thread) (Holley Sniper EFI Fuel System Plumbing - Posts #2, #6, #14) (Holley Sniper EFI Fuel Pressure Tester/Gauge) (WBO2 Sensor Test At End Of "Wideband O2 Sensor Notes") (Holley Sniper EFI Replacement Parts) (Holley Sniper EFI Main Harness Wire Gauge List) (Holley Sniper EFI Incompatible 3.5" TSLCD Firmware) (Holley Sniper EFI Save Config File On SD Card, LINK - Page 73) (Holley Sniper EFI Datalogging Tech Video) (Holley Sniper EFI Assembly Line At Holley Facility) (How To Install A Holley Sniper EFI System) (Holley Sniper EFI - Dual Sync Distributor Installation Tech Video) (Holley Sniper EFI - Dual Sync Distributor Installation Tech Video) (Holley Sniper EFI - MSD Distributor Installation Tech Video) (Holley Sniper EFI - MSD Distributor Installation Tech Video) (Holley Sniper EFI - MSD Distributor & CDI Box Installation Tech Video)

    Originally Posted by Danny Cabral
    The Target Air/Fuel Ratio Table & Base Fuel/Timing Table (and MAP kPa & RPM axes/scales) should be configured using the Sniper EFI software:
    In the Sniper EFI software (LINK), Target Air/Fuel Ratio Table (Fuel ICF) & Base Timing Table (Spark ICF), select "2D Table" Type (not "Simple").
    The Target Air/Fuel Ratio Table & Base Timing Table can then be properly configured & tuned for any engine. (Sniper EFI Software & Holley 558-443 CAN/USB Dongle)
    Originally Posted by Danny Cabral
    Is the Sniper EFI Learning? Is the ignition timing synchronized? Is the fuel pressure 58-60 psi (LINK)? IAC Position
    of about 5% at hot idle? Check for ignition misfires/RPM signal problems, exhaust leak upstream of WBO2 sensor,
    or if the WBO2 sensor (or other sensor) has failed and corrupted the Learn Table. Look at the Data Monitor/Gauges.
    Also, the Holley Sniper EFI will inhibit Closed Loop if the AE vs TPS/MAP RoC Blanking values are set too low. (Holley Sniper EFI Help File) (Holley Sniper EFI Troubleshooting Guide) (Holley Sniper EFI Fuel Pressure Tester/Gauge)
    Originally Posted by Danny Cabral
    The Sniper EFI doesn't have the same TPS Autoset function as the Terminator, HP & Dominator ECUs. The Sniper EFI calibrates the TPS sensor
    at every key-on event. If replacing the TPS, the TPS sensor is located at the end of the primary throttle shaft, opposite end of the throttle lever.
    It's slotted, so install it in the same position. Holley 543-111 TPS or Standard Motor Products TH191 TPS. (Replacement Sensors For Holley EFI - Auto Parts Store)

    Sniper EFI Idle Setting/Throttle Blade Setting (Holley Sniper EFI Quick Start Manual):
    Once the engine is up to operating temperature, the idle speed can be set to what was configured in the Wizard.
    To do this, open up the Initial Startup gauge screen that was used in section 17.0. With the vehicle in neutral,
    adjust the idle screw until the IAC Position reads between 2 and 10%. While adjusting the screw if the TPS
    Position reads begins to read higher than 0% cycling the ignition switch will recalibrate the TPS back to zero.
    NOTE: Do not attempt to set the Target Idle Speed and IAC Position until the engine is above 160°F! (Holley Sniper EFI Quick Start Manual - "Idle Setting/Throttle Plate Setting", Page 11)! (Sniper EFI High Idle Thread)
    Originally Posted by Danny Cabral
    For further assistance, post your Config File and a short datalog of this occurrence for us to analyze.
    Also, review the datalog and inform us of exactly where in the datalog (time/seconds) the problem occurs.
    Datalog & Global Files must be linked to a document hosting website. I use
    Files can also be "zipped" (compressed zipped folder) & attached directly to a forum post.
    Your Config File is in the "Documents", "Holley", "HEFI V4", "Global Files" folder (.hefi file).
    Someone will analyze/troubleshoot the problem & offer advice.
    Originally Posted by Danny Cabral
    It's helpful to record a short datalog of an occurrence, Overlay it onto your Config File, and manually tune the lean or rich problem area.
    Look at where the live cursor moves to during this occurrence, and manually tune (enrich or lean) that area of the Base Fuel Table.
    When the engine is tuned & running well, you should decrease the Closed Loop and Learned Compensation Limits % to lock in a good tune. (Holley Sniper EFI Datalogging Tech Video) (Closed Loop & Learn Table - Especially posts #2, #6 & #11.)
    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 Config 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.

    I find the most helpful datalog function, is overlaying the datalog on your Config 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 Config File screen.
    Then click & scroll anywhere on the datalog, and watch it playback on your Config File (EFI software). (Holley EFI Datalogger Instructions) (Datalog Information - Read "NOTES") (How To Record & Email A Datalog) (Closed Loop Datalog Tuning - Posts #2, #4 & #6)
    May God's grace bless you in the Lord Jesus Christ.

    '78 BRONCO: 508" stroker, TFS heads, 11:1 comp ratio, Dominator MPFI & DIS, cold air induction, Spal dual 12" fans/aluminum radiator, dual 3" exhaust/Magnaflow mufflers, Moroso vacuum pump, Accusump, engine oil & trans fluid coolers, 100HP progressive dry direct-port NOS, A/C, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, traction bars, 4" Skyjacker lift, 35" mud tires

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