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Thread: HP EFI - Northstar Ignition Harness

  1. #1

    Default HP EFI - Northstar Ignition Harness

    Can someone help me find the ignition harness for an HP EFI 550-604 for a Northstar engine. I want to use the original Northstar coil pack. Can I? Thanks.

  2. #2
    Join Date
    Dec 2009
    Location
    Connecticut
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    23,676

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    Quote Originally Posted by Jeebee View Post
    Can someone help me find the ignition harness for an HP EFI 550-604 for a Northstar engine.
    Holley doesn't offer a specific ignition adapter harness for the Cadillac Northstar engine.
    However, if it's long enough, the 558-304 GM HEI Ignition Adapter harness can be used.
    Just cut off the small 4-pin connector (main harness remains intact) and wire it as described below.

    I want to use the original Northstar coil pack. Can I?
    Yes. In the EFI software, select "1993-1999 Cadillac Northstar Gen 1" as the Ignition Type. (Not sequential if no cam signal.)
    The Cadillac Ignition Control Module (under coil pack) is wired to the Holley EFI ECU, the same way a GM HEI is connected.

    Cadillac ICM Connector..Holley Ignition Connector/Adapter
    Pin C......................... Pin A - Crank Input
    Pin D......................... Pin B - Bypass
    Pin E......................... Pin H - EST/Spout Out
    Pin F......................... Pin D - Chassis Ground
    http://documents.holley.com/techlibr...10555rev17.pdf (Holley EFI Wiring Manual - Section 5.3, Page 11 & Figure 3, Page 13)

    Attachment 3171
    http://www.rockauto.com/catalog/more...808&cc=1313843 (Cadillac Northstar Coil Pack Ignition Control Module)


    (Photo courtesy of "CalEditor", EFILive.com forum: http://forum.efilive.com/showthread....ll=1#post67804)
    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/3000 RPM converter, 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 MT tires.

  3. #3

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    Danny, big thanks for replying to my question about coil wiring! And now, do you know if the HP EFI can drive an electric water pump with the Input/Output...or if it's better to use an external drive for the pump? Thanks again!

  4. #4
    Join Date
    Dec 2009
    Location
    Connecticut
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    Quote Originally Posted by Jeebee View Post
    And now, do you know if the HP EFI can drive an electric water pump with the Input/Output...
    Yes, you can create a custom Output (I/O ICF) to control an electric water pump.

    Create a custom Output (I/O ICF), Name it, select Type, Enable it & Configure it.
    It must be Pin-Mapped to an available ECU connector output pin; click "View Outputs" on the Pin Map.
    Then click & drag it to an available output pin. Now you can run this wire to your electric pump relay.
    A relay must be used because all the ECU's Outputs are rated at a maximum of 2 amps.

    FYI: Holley's 554-111 High Current Relay (device/solenoid driver) is not for use as a continuous duty pulsing relay.
    It's rated at 40 amps and can operate at 100% duty cycle continuously or temporarily pulsing (PWM) high currents.
    http://documents.holley.com/199r11304.pdf (NOS 15620NOS Solid State Relay Instructions - See Page 2)

    To connect up to 4 Inputs & Outputs to the EFI main harness, use I/O Auxiliary Harness 558-400.
    Eight Wire I/O Auxiliary Harness Connector Pin-Out (also in the Holley EFI Wiring Manual Link):
    Pin A...A12...White/Blue (Input #1) F,5,2,T,H,G
    Pin B...A3....White/Red (Input #2) F,5,2,T,H,G
    Pin C...A13...White/Black (Input #3) F,5,G
    Pin D...A4....White/Green (Input #4) F,5,G
    Pin E...B12...Gray/Yellow (Output #1) H,P+
    Pin F...B11...Gray/Red (Output #2) H,P+
    Pin G...B10...Gray/Black (Output #3) G,P−
    Pin H...B3....Gray/Green (Output #4) G,P−
    http://documents.holley.com/199r10516.pdf (Holley 558-400 I/O Auxiliary Harness Instructions)


    If the I/O menu icon (ICF) isn't already uploaded (added) to the top Toolbar, follow these instructions:
    (This same procedure applies to all the various Individual Configuration menu icons/items.)
    The "I/O" function is an "Individual Configuration" of the Holley EFI software.
    At top of screen, Click "Toolbox" and "Add Individual Config".
    At top of new window, select "Individual Configuration Library".
    At bottom of new window, select "Holley EFI Inputs/Outputs Config".
    Select "I/O" and open "Base Config - Blank.io".
    The "I/O" icon will then be present at top of screen.
    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/3000 RPM converter, 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 MT tires.

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