Hello,

1992 SVX, six cylinder

I have the O2 sensors set-up so I can measure and read the voltage when I drive.

I seem to have a problem that is getting worse.

When I start the car the O2 reads very high on the left side, 6 to 7 volts and then it comes down slowly to about 1.5 volts after about 7 minutes.

I think it has been doing this since I started to monitor the O2 but the readings were different then. It was only about 2 to 3 volts and came down quite quickly in just a few minutes.

The right side is working just fine.

I am thinking the o-rings that seal between the injector and fuel rail are bad and leaking when the engine sits for awhile.

Does anybody know anything about this?

What is the way to get the injector out? Can compressed air be used? I also have spare fuel rail assemblies with injectors with about 150k miles.

Oh I have about 270k miles on this engine and I get 28mpg.

I also have a fuel heater that may have cooked the o-rings or something else I did and I also have an HHO generator working. I have been experimenting with this for awhile.

Any comment will be welcomed just don't make fun of the HHO!!!! I am just giving it a try.

I think that you may just be seeing the old-age death of your O2 sensor. From my (limited) understanding, they start to get slow in their response as they age. There was also a thread a couple of years ago about O2/EGO sensors where somone (maybe SubaruJunkie???) mentioned that the ECU on some cars/models sent a "health-monitor" voltage to the O2 sensor, and if the O2 sensor read above a certain voltage (2-ish???) then the O2 sensor was not currently functioning. So, put those maybe-incorrect "facts" together and I would guess that the O2 sensor(s) might need replacing soon. Or just don't get worried until the sensors come up to working temp.

Thanks for the response.

 

The only problem I have is that when it is rich it using a lot of gas!!!! This backs-up the rich reading I see on the O2. It also means the left side is way richer than the right side. I thinkthe engine will have a problem with that.

 

The one day I made a few stops and the engine was very hot. It was a hot day. I tried to start it and it just kept stalling out. The O2 said it was rich. After awhile it ran okay. I got 22 mpg that day on the tank of gas and not the usual 28 mpg.

 

Any information on changing the o-rings or assembly would be helpfull before I do something dumb and go off in my exploring mode.

 

Peace