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Thread: Idle Tuning Problem

  1. #1

    Default Idle Tuning Problem

    Hi Guys. Finished new install on a mild SBF N/A. Now starting to learn & tune. I'm having trouble getting a consistent idle and struggling with off idle stumble. I haven't used any of the modifiers yet, but I've tried adding fuel and removing fuel in the affected areas but no improvement. Hoping to post my datalog and Global File to get some feedback. Thanks.
    https://www.dropbox.com/sh/ee9t59oki...ikmXL-WBa?dl=0

  2. #2
    Join Date
    Dec 2009
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    Connecticut
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    23,099

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    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/2800 RPM converter, M4602G aluminum driveshaft, FRPP 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 tires.

  3. #3
    Join Date
    Nov 2014
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    Ont. Canada
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    1,454

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    Read up on Injector End Angle, mine did not like to be set at 0°, like you are right now. Why is your Closed Loop Advanced Control set to Custom?
    Last edited by 81 TransAm; 11-09-2019 at 07:12 PM.

  4. #4

    Default

    Will do. Danny just sent me a link to a more in depth thread on that topic. I'm hesitant to make too many changes outside of base fuel & timing because a common phrase I keep seeing on multiple topics, "The idle quality must be well tuned before adjusting". I didn't set "Closed Loop Advanced Control set to Custom" on purpose. If it's not that way by default, then I must have changed it by accident.

    Closed Loop Advanced Control is set to Custom by default on the base "MPFI, up to 409 ci, cam 216-225@.050.fuel" configuration. Should I be using 1-5 instead?

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