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Mixture adjustment 200 1983

uid 18083's pic
posted by  lucid on  Thu May 6 01:44 CST 2004
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last visit: Fri Oct 24 12:31 CST 2014
[RELATED]

I don't know about the Intercooled turbo, but the stock '83 has a "Charge Air Pressure" switch on the firewall that should richen the mixture as soon as manifold pressure gets to about 3 psi.

It grounds Pin 7 on the Lambda ECU to force a preset duty cycle of something like 68° dwell (normal warm dwell is about 45°). This is the same preset value as when engine coolant is below 60° F.

As a quick test, go to the firewall switch and jumper the green wire to ground, then see if the A/Fmeter reads better. I wired ours to an unused instrument bulb so we could see when the switch closed.
--
Bruce Young
'93 940-NA (current) — 240s (one V8) — 140s — 122s — since '63.






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