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Old 08-20-2010, 11:49 AM   #1
alejo
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Default how to check air/fuel ratio

I fell my 1999 OBS is running a little rich. How can I be sure? If so, what can I do?
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Old 08-20-2010, 12:05 PM   #2
Storm
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In the days before fancy A/F gauges, we would go out and make a hard pull then clutch in and pull to a stop ASAP. Pull the plugs and read them for color, deposits, etc.....

Nowadays, you can tap the O2 sensor wire with a digital voltmeter and read the voltages when under load. When you know what the readings are, you can look around for corresponding A/F values for a given voltage. If memory serves, you should see something around 0.80vdc. The narrowband sensors are only accurate right near 14.7:1.....they tend to act more like a low-good-high switch.

Another, more accurate way would be to buy a wideband sensor kit and install it separately from the OEM sensors. It will serve as a real-time monitor for the A/F ratio.

Jay
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Old 08-20-2010, 01:56 PM   #3
alejo
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thanx. do you know of any link to buy the kit online?
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Old 08-20-2010, 03:52 PM   #4
Skidd
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STM

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Another option is one of these:

OBDKey OBD2+SSM Bluetooth Module

Plus, a Java and Bluetooth Capable Cell Phone.

And the software ECUTracker
(I'm the author of ECUTracker by the way)

Resulting in


That combination above will give you mobile ability to monitor the Subaru SSM protocol, which includes the OEM Wideband sensor. Granted, the accuracy of sensor can't be confirmed with this setup, but if it's indeed correct, you can at least see what it's reading.
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Old 08-21-2010, 02:13 PM   #5
alejo
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Quote:
Originally Posted by Skidd View Post
Another option is one of these:

OBDKey OBD2+SSM Bluetooth Module

Plus, a Java and Bluetooth Capable Cell Phone.

And the software ECUTracker
(I'm the author of ECUTracker by the way)

Resulting in


That combination above will give you mobile ability to monitor the Subaru SSM protocol, which includes the OEM Wideband sensor. Granted, the accuracy of sensor can't be confirmed with this setup, but if it's indeed correct, you can at least see what it's reading.

where can I buy it?
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Old 08-23-2010, 02:35 PM   #6
Skidd
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STM

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Buy Which? The OBDKey?
http://www.obdkey.com/
It's not cheap, but it's the ONLY Bluetooth OBD module I'm aware of that can also do the SSM protocol.

ECUTracker is totally free though.
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