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O2 output questions, Disagree with Andrew Posted by Kevin K [Email] ![]() ![]() In Reply to: Re: CIS Injection: O2 output questions, Todd 83-900T, Sun, 20 May 2001 22:45:35 Members do not see ads below this line. - Help Keep This Site Online - Signup |
If you disconnect and measure output, and car is in proper tune, it will likely be any reading from about .4 to .7V, since default mod-valve cycle was supposed to be near stoich to a bit rich. Keep in mind that voltage response of O2 output can range from .25 to .75 volts, with mix at stoich. It is highly non-linear, and not real accurated outside of stoch range.
Main thing is that it is attempting to maintain .5V . rich-lean-rich-lean was a misrepresentation by mean ;o .... it's more like stoich+, then stoich-, oscillating very close to stoich, by way of the mod valve, which does NOT control line pressure, but rather lower chamber pressure. And it is not throwing xtra gas at cat, it is at stoich, which tends to be efficient.
As long as idle voltage oscillates about .5V, per analog VOM, and mod-valve is averaging 40-50%, things are likely ok.
I found at wot, I had about .8V, which is a bit low. Terminal 11 could be shorted by tb switch (vs 7) for more fuel.
I run redline FI cleaner once every few months. I think the MSD ign also keeps idle smooth. Make sure those inj-seals are not leaking.
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