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Establishing baseline - K-jet 140-160 1974

posted by  Kane on  Wed Jan 29 18:25 CST 2003
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Having since made things worse ... any tips on re-establishing the baseline A/F ratio on a '74 B20F with K-jet injection?

Where is is right now ...

- with the air intake hose off, it'll start but barely sustain running with the throttle at about 3/4. Throttle plate is at rest, with a slight gap of about a paper's thickness.
- with the air intake connected, it'll barely start, and sustain running at about 1500 rpm with the throttle wide open. At half throttle, it's "idling" at around 3-500 rpm.

Ignition stuff is all fresh (plugs, wires, cap, rotor; no points, it was previously swapped for a Pertronix). Compression is fine (140-150). Exhaust is free-flowing, single muffler with pipes bent from sch.10 piping.

Too lean, too rich, or just so way off that I'll just have to try everything?

-- Kane ... it all started when dad said "it needs more power!"
--
Blossom II - '91 745Ti/M46 ... Bubbles - '74 144GL/BW35 ... Buttercup - '86 245GL/AW70 ... The Wayback Machine - '64 P220/M40








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    Establishing baseline - K-jet 140-160 1969

    posted by  volvobub on  Thu Feb 6 15:50 CST 2003
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    last visit: Wed Dec 9 11:59 CST 2009
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    Heres how I've done it for years,works great.Pull the intake bellows at the air "flapper" @ the fuel distributor.Lift the sensor plate and stick in just the end of the smallest size tie strap.Pull an injector,jump the fuel pump relay so the pump runs and turn the adjustment screw until the injector just starts to spray.Put it all back together and fire it up.When I say just the end of the tie I mean JUST THE VERY END!








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    Establishing baseline - K-jet 140-160 1974

    posted by  patrick of montreal on  Sat Feb 1 05:39 CST 2003
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    last visit: Sat Oct 18 08:25 CST 2014
    [RELATED]

    Generally if I'm lost I start with cleaning a plug, put it back in run for 5 min take a look. However, sounds lean to me or it would get worse as the engine heated ( rich is the same as choke). Check your line pressure, before and after ditributor against specs.







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