Holley Sniper EFI 550-510 Quick Start Manual Download Page 5

7.

Locate a position for the oxygen sensor as close to the engine as possible. The oxygen sensor should be mounted at a
point where it can read a good average of all the cylinders on one bank.  This would be slightly after all the cylinders merge.
If you have long tube headers, mount the sensor approximately 1-

10” after the collector.  You must have at least 18” of

exhaust pipe after the sensor.

8.

If your vehicle has catalytic converters, the oxygen sensor MUST be located between the engine and the catalytic
converters.  It is also CRITICAL that the oxygen sensor is NOT installed in the bottom of the exhaust tube.  This will help
prevent condensation in the exhaust tubing from entering the sensor.  The clamp-on kit installation requires a 3/4 hole to be
drilled in the exhaust system.  Refer to main installation manual for more details.

Oxygen Sensor Bung

Clamp-On Oxygen Sensor Bung

WARNING!  Only use ONE of the following Ignition Installation Options.  NEVER connect 

the Purple wire to the Ignition Coil! 

9.

Option 1

.  

Coil (-) Ignition

 - Locate the YELLOW wire on the Main Harness, this wire will be labeled Coil (-) Input.  This

wire can either go to the NEGATIVE side of your ignition coil

, or to “Tach” label on a GM Large Cap HEI distributor w/

internal coil.  

NEVER

 run the YELLOW wire to the negative side of a coil while using a CD Ignition box.

Ignition Option 1 

Canister Style Coil 

GM Large Cap HEI w/ Internal Coil

Summary of Contents for Sniper EFI 550-510

Page 1: ...N INSTRUCTIONS Congratulations on your purchase of a new Sniper EFI Throttle Body System built by craftsmen to exacting standards in our Bowling Green Kentucky facility Every Sniper EFI System is 100...

Page 2: ...hrottle body If there is not enough material a sealing plate Weiand PN 9006 can be used Factory dual plane intakes will require an adapter PN 17 6 Fuel System Requirements The Sniper EFI system requir...

Page 3: ...ON Timing Control Ignition types shown in step 8 for your first start up Before beginning the Sniper EFI installation we recommend that you locate a CLEAN Switched 12v Ignition source This source need...

Page 4: ...e a constant flow of coolant 5 Reconnect the appropriate vacuum hoses to the Sniper EFI throttle body Be sure to plug any vacuum sources not used Vacuum Port Side View 6 Connect fuel feed and return h...

Page 5: ...exhaust tube This will help prevent condensation in the exhaust tubing from entering the sensor The clamp on kit installation requires a 3 4 hole to be drilled in the exhaust system Refer to main inst...

Page 6: ...to the ignition coil C D Box w Tach Adapter to Main Harness Main Harness Overview 11 The PINK wire labeled Switched Ignition needs to be terminated to the ignition source found and labeled from page 1...

Page 7: ...E must remain powered during cranking 10 Pin Connector 8 wires are populated This connector contains Pin Color Labeled Name Function A Orange Input 1 Optional Connect to a ground triggered A C relay B...

Page 8: ...Select the number of cylinders your engine has STEP 4 Use the slider bar to input the displacement of your engine STEP 5 Use the slider bar to set your desired HOT idle speed This is the RPM the Snip...

Page 9: ...timing For more details on this feature refer to the Ignition Wiring Section of the Reference Manual Yes Proceed to Step 10 No Skip to Step 11 Note We highly recommend first starting the engine with...

Page 10: ...erly Go into the MONITOR MULTI GAUGE and select the AIR FUEL RATIO Icon Closed Loop Status Indicates whether the engine is Closed Loop or Open Loop Closed Loop indicates that the ECU is adding or subt...

Page 11: ...you can adjust the idle cruise WOT and Cranking timing settings FIRST DRIVE Congratulations on a successful installation of your Sniper EFI system Next you need to simply drive your car and let the S...

Page 12: ...12 SYSTEM INSTALLATION OVERVIEW...

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