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Thread: New startup with Terminator X.

  1. #1

    Default New startup with Terminator X.

    First startup idle was good, but IAC was at 62%. Sniper race intake (838232), 90mm Sniper Throttle body (860008-1) 48 lb/hr Holley injectors fuel pressure set at 45 psi, Holley IAC (543-34). Did an IAC reset by blocking of the IAC and adjusting the idle to target, the IAC Position was then reading 5%. Shut the car off did a TPS Autoset and the car started and idled great. As soon as I have it some throttle the car shot up to 2500 RPM and would not idle back down. The IAC was reading 50% when this happened. Are the below settings the correct settings for the IAC? My Advanced Idle Control is currently set as GM LSx, do I need to change it to Slow? Any info would be greatly appreciated. Side note, I'm a total newb to EFI!

    Quote Originally Posted by Danny Cabral
    Typical IAC Control/Ramp Down Parameter Settings
    Advanced Idle Control: ......................... Slow (Usually the best control.) Sniper EFI users select "Sniper TBI".
    IAC Type: .......................................... Stepper (4-wire), PWM (2-wire)
    IAC Hold Position: ................................ 10%-30% (Usually 15%-20%.)
    Ramp Decay Time: ............................... 1.0-3.0 sec (Usually 2.0 sec.)
    RPM Above Idle To Start Ramp: .............. 1000 RPM (Or higher.)
    RPM Above Idle To Re-enable Idle Control: 50-200 RPM (This setting can be finicky.)
    Startup IAC Position - Hold & Decay Time: 1.0-1.5 seconds (Less is typically better than more.)
    Not IAC, but Idle Spark control usually works well at: 30-40 P Term & 50-60 D Term.

  2. #2
    Join Date
    Dec 2009


    Quote Originally Posted by Chris1973Z View Post
    My Advanced Idle Control is currently set as GM LSx, do I need to change it to Slow?
    Not if that's the engine type you have.
    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


    It’s a 6.0L with LS3 heads. Any suggestions?

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