Toyota Oxygen Sensors

[penetrator]

Hey guys just have a couple of questions - I have a 92 V6 Surf and recently i removed the exhaust pipe that runs from the drivers side manifold round the block into the passenger side manifold. I now have two pig tails going into a Y join in the original exhaust pipe. Now this should be a lot better for the engine by not having all that heat up there and less pressure but the oxygen sensors are worrying me a bit. The first one is quite high up the original pipe before the new Y join connection. This means that sensor is only reading the exhaust from 3 cylinders not 6. Also the cat converter oxygen sensor has been welded to the body after the cat was removed.

My question is will this be making the computer make the air fuel mixture richer and therefore not achieving the fuel economy it should do? Is it worth paying to have the sensors moved and plugged back into the exhaust somewhere?

For petemcc and anyone else who is interested by doing this mod it is definitley better for the engine not having that heat up there but in terms of peformance it has not been what i expected. I had noted that it picked up a bit quicker in 1st, 2nd, 3rd gears but once it hits about 2500rpm - 3000rpm you can hear the gas trying to pile back into the factory exhaust at the new Y join. This is definitl;ey not helping and i have removed more of the rear exhaust which has helped again. I will look at removing the rest of the original pipe and replacing with a 2.5inch pipe and free flow exhaust soon which i think will make a vast improvement.

I also bought a Hiclone and put that in the other day - seems to give it a bit more tourque up hills and the engine runs quieter - will be interesting to see the fuel economy it is meant to deliver when i do a return trip from Qtown to chch this weekend.