Question about 1990 Subaru Legacy

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Car ships replaced wires plugs o2 sencer sometimes acts like it is flooding run fine on open road.

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Jeremy Moore

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If it acts like it is flooding while idling, but it runs fine on the road, it could be running too rich and flooding it out due to leaking injectors, bad fuel pressure regulator, or excessive fuel pressure.

I would start by replacing the Fuel Pressure Regulator since it doesn't cost as much as the injectors.
Check your fuel pressure using a Fuel Pressure Check Gauge to see if the fuel pressure regulator is maintaining the proper pressure.

Vacuum is attached to the Fuel Pressure Regulator to control system pressure. When the fuel pressure regulator is not functioning properly it causes the fuel pressure to be above normal operating pressure. This condition causes excess fuel to be injected causing a rich mixture that produces black smoke.

I’m happy to help further over the phone at https://www.6ya.com/expert/jeremy_69f3cc28d95bf514

Posted on Feb 16, 2011

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You should be able to reach it from the top. It is a stretch. The hardest part is getting it out. If you have the new part already you can cut the wires and use a regular socket wrench to get it off. Some like to run the engine for a minute or two before starting. Soak it with PB Blaster, wait a minute, and go at it. If clearance is an issue, try a box end wrench. The socket designed for the O2 sensor has a split in it that sometimes can spread. It is also hard to use the knuckles as they deflect a lot of torque.

Once it is removed, make sure that the paste is on the threads. This will help the next time this needs to be done. Thread it in, torque it down, and plug it in ( the plug is on the alternator bracket.)

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