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False air 200 1992

posted by  Amarin on  Mon Nov 2 13:49 CST 2020
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last visit: Thu Oct 23 22:42 CST 2014
[RELATED]

"Measured w.r.t. ground, the scope showed a decrease in duty cycle when the load increased"

With the aid of your Agilent multimeter, you are comparing the duty cycle between "idling free engine" vs. "idle under load". This without any possibility of additional load on the engine (eg AC).

I think (still suspecting intermittent air leak) instead you should be doing a duty cycle comparison between "idle with no air leak" vs. "idle with air leak". May I suggest pulling a vacuum hose out (eg the flame trap's small hose) or loosening the IAC hose's clamp on the manifold vacuum side, letting the idle raise a bit.

Regards,
Amarin.





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