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Surging Idle on startup.

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  • Surging Idle on startup.

    On warm startup my engine will surge to 1500 RPM the back down to almost stalling before settling to a 750 RPM idle. Currently my Advanced Idle Parameters are as follows; IAC Ramp Down Hold 25%, Ramp Decay 2.5 sec, Ramp Start 1000, Kick 50%. Idle Spark control enabled. Do these settings look satisfactory? Do they effect the problem I'm trying to solve?

  • #2
    You need to list the engine specs, camshaft specs, and post the Global File. If you're still using the 3.5" TSLCD handheld, you should probably get setup to tune with a laptop. Upload the GCF and someone can help.


    • #3
      1967RS/SS: It sounds to me like the throttle blades are not adjusted properly. What are the IAC Position values at idle when the engine is good and hot? Andrew
      Instagram: @projectgattago
      Offering remote Holley EFI tuning.
      I deliver what EFI promises.
      Please get in touch if I can be of service.


      • #4 (Good Startup Tuning Advice Post)​
        May God's grace bless you in the Lord Jesus Christ.
        '92 Ford Mustang GT: 385"/6.3L SBF, Dart SHP 8.2 block, forged steel crankshaft & H-beam rods, forged pistons, Trick Flow Twisted Wedge 11R 205 CNC Comp Ported heads, 12:1 compression ratio, 232-244 duration/.623" lift/114 LSA camshaft, TFS R-Series FTI Comp Ported intake, BBK 80mm throttle body, Holley Dominator MPFI & DIS, Holley 36-1 crank trigger, MSD 1x cam sync, PA PMGR starter, PA 200A 3G alternator, Optima 34/78 Red battery, 100HP progressive dry direct-port NOS, R134a A/C, Spal Dual 12" HP 3168 CFM fans, Frostbite 3-core aluminum radiator, Pypes dual 2.5" exhaust, off-road X-pipe, shorty headers, Earl's -6AN fuel system plumbing, Walbro 255 LPH in-tank pump & Pro-M -6AN hanger, S&W subframe connectors, BMR upper & lower torque box reinforcements, LenTech Strip Terminator wide-ratio AOD, 3000 RPM C6 converter, B&M Hammer shifter, Stifflers transmission crossmember & driveshaft safety loop, 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.