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Old 03-27-2013, 10:28 AM   #1 (permalink)
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94 Honda Civic VX lean burn question

What causes the ECU to put the engine into lean burn? Temperature, oxygen, the airspeed velocity of a swallow carrying a coconut?

I'm trying to track down some lean burn issues, and while I perform some troubleshooting steps, I would like to have a little more info on lean burn from people who have alot more experience with it than I do. Thanks.

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Old 03-27-2013, 03:44 PM   #2 (permalink)
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I believe it's some combination of:
Coolant temp, intake air temp, RPM, manifold pressure (proxy for engine load), throttle position, and possibly a few other factors.

Have you been able to chase down a good manual for your car? The factory manual or equivalent should lay out the conditions. There are places you can download factory-type manuals for various Honda products; not sure if the VX one is in that list.

-soD
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Old 03-27-2013, 04:22 PM   #3 (permalink)
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I do have a paper service manual for my car, and a huge PDF one.
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Old 03-27-2013, 04:25 PM   #4 (permalink)
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Quote:
Originally Posted by some_other_dave View Post
I believe it's some combination of:
manifold pressure (proxy for engine load)
What can I do to test this? What can cause it to be incorrect?
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Old 03-28-2013, 08:56 PM   #5 (permalink)
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Rusty crusty trusty - '94 Honda Civic Cx
90 day: 36.13 mpg (US)

Vx - '92 Honda Civic Vx
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Google search. You can use a voltmeter and monitor the 02 output. It's load throttle position 02 temp and map load.

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