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Thread: Help with idle timing and exhaust smell, why?

  1. #1

    Default Help with idle timing and exhaust smell, why?

    I could use some help with idle timing and exhaust smell. Engine info might help. Ford 351W, Mechanical cam 238° @ .050" intake & exhaust, .510" lift, 108° centerline
    Operating range 2800-7200 RPM. Atomic is controlling timing. What I've experienced.
    Exhaust smells bad: Idle
    Good throttle response.
    Water temp increases slowly.
    Idle target: 850 RPM
    Idle RPM: 1000 RPM
    Total RPM: 2800 RPM
    Idle Adv: 10
    Total ADV: 30°
    Vac ADV: 14°
    Vac ADV type: Manifold

    Display advance at idle: 20°
    I've read that advancing the base idle timing can cause issues with the WBO2 sensor and cause a rich mixture.
    Would I try to lean out or enrich up this setup to change the exhaust smell (really hurts the eyes).
    ----------------------------------
    Not much exhaust smell: Idle
    Slow throttle response.
    Water temp increases quickly.
    Idle target: 850 RPM
    Idle RPM: 1000 RPM
    Total RPM: 2800 RPM
    Idle Adv: 10
    Total ADV: 30°
    Vac ADV: 14°
    Vac ADV type: Ported

    Display advance at idle: 4°. Can any one explain why they these two setups react so differently?
    Also, not to happy with hot starts. It seems sluggish compare to my last carburetor. Thanks.

  2. #2
    Join Date
    Dec 2009
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    Default

    Quote Originally Posted by focussvt2002 View Post
    Display advance at idle: 20°
    ----------------------------------
    Display advance at idle: 4°.
    Can any one explain why they these two setups react so differently?
    4° idle timing is excessively retarded.
    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

    Default

    Please give us a call when you're with the car, so we can go over your settings and get the system setup for you. Thank you.

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