Got my UEGO, going on my truck, first. Had a thought, truck has all emission controls onboard and working. Will the air injection system effect the O2 readings?
88 D-150 360 4bbl. No computer, factory O2, or feedback carb. Does have Cat converter.

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225

Yes, absolutely.

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Joshua

Where is the air injected?

If you're before the injection, it will work correctly (except at low rpm where you might get some backflow)

Otherwise you need to cap it off (might get some air sucked thru if only belt removed)

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Ed
64 Valiant 225 / 904 / 42:1 manual steering / 9" drum brakes

Air is injected at the rear of the head. Kind of thought it would skew the AFR readings. Easy enough to remove the rubber hose at he pump and cap the tube, while I'm testing. Thanks

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225

How do new cars do this then, with O2 sensor readings? I guess they have correction factors or something...

Lou

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Home of Slant6-powered fun machines since 1988

Air injected before O2 sensor would only be during open loop mode (usually just warm up to get cat hot quick)

Then it would be injected after sensor during closed loop.

They're also using electric pumps that are shut off when not needed.

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Ed
64 Valiant 225 / 904 / 42:1 manual steering / 9" drum brakes

Thanks, Ed.

Lou

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Home of Slant6-powered fun machines since 1988

My 88 diplomat with a 318 lean burn, has a O2 sensor on the driver side exhaust manifold, right near the number 5 exhaust port. It also has the exact same air injection system, into the rear of the cyl head. I have removed the LB system, and use the O2 sensor to feed a narrow band gauge. After warm up, and light throttle cruise, the gauge goes so lean, it is off scale (whatever scale is). Just has LED bars of different colors. I think, the next chance I get, I will disable the AIR system, and see what if, any difference it makes in the readings.

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225

Spark plug non-fouler.

- Erik

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Lots of early Valiants and Barracudas have crossed my path.
Also a handful of other toys for variety now and then.