polo451

hi guys , i have a 93 fd with a few i/e mods and the wire of the stock O2 sensor got cut , i cant replace it cause the new one i got is too long

but running without it doesn't seem to change anything , it's even better , i'm not sure but i think i even have a better mileage

is it dangerous for the engine to run without the sensor? what could happen ?

thanks

fendamonky

iTrader: (6)

You should be ok without the sensor, what ECU are you using? (If you have the PFC and Datalogit than I believe you can program it to run close look, i.e. no sensor at all).

I would certainly get a plug for that hole though... you don't want that venting out under your hood.

DaleClark

iTrader: (55)

With the stock ECU, you need the O2 sensor to get the best fuel economy. With a PowerFC, the O2 sensor is useless.

If the wire is just cut, just splice the wire back together, no big deal.

Dale

polo451

i am running the stock ecu , and the car runs very smooth but i am afraid tu run lean , is there a risk ?

the sensor is still in place , i have a stainless downpipe and the location for the sensor is very close to the turbo , so i'm afraid i'm gonna have to make a new hole in it if i want to replace the sensor
or maybe it would be time to buy a A/F meter with wideband

fendamonky

iTrader: (6)

You do not need to tap/weld another bung in order to replace the stock sensor... just unscrew the current one and replace it with a new one.

Getting a Wideband O2 sensor is always a good idea, but I don't think you will need it (or see any improvements from it) since you have the Stock ECU still. If you got and mounted one it would be there mostly for your own peace of mind. If you do get one do not mount the sensor anywhere near the stock location, being too close to the turbo's will fry a WBO2 sensor with a quickness, best idea would be to mount it a couple inches from the joint between the Downpipe and the Midpipe.

polo451

yep but , the location of the hole on my aftermarket downpipe is making the sensor nearly touch the turbo , and the new sensor i bought is longer so it won't fit in the hole ... i won't be able to screw it

for the wideband , if you say it's not that necessary it'll wait

so you think there is no risk for the engine to run without the sensor ?
if its just a question of pollution then it can wait but if its vital for the engine i'll stop driving the car until it is repaired

thanks for your help

fendamonky

iTrader: (6)

The Bung location on all aftermarket Downpipes I've seen is close to the turbo's but not too close. Can you take a picture of exactly how close we're talking here?

I'm not sure on with the stock ECU. I know that before I shipped my car to England I was driving w/o an O2 sensor (not sure how long, just noticed one day that the wiring had snapped off at the sensor itself). There was nothing wrong with the Engine, but I had a PFC in.

Also, random question, is your 7 a RHD or LHD version (the downpipe is very different based on which one you have)

polo451

well i dont have a picture here but i can tell you the sensor is less than a millimeter close to the turbo , and the downpipe was made by a garage specialized in japanese cars in belgium , but i think they missed the right location of the sensor... but it was made for LHD cars
and my car is a german car , LHD

i just hope the engine won't run too lean because of this