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I have the Eurocharged shorty headers with 200 cell cats and all 4 oxygen sensors. Attempting to get through emissions and getting diagnostic codes thrown
0422 - Main Catalyst Efficiency below threshold bank 1
0432 - Main Catalyst Efficiency below threshold bank 2
I spoke with Jerry at eurocharged ( who's been fantastic btw, excellent customer support) and asked if he thought extenders would be a good idea downstream sensors, for the ECU to see less oxygen and he agreed.
So I've got a couple of them, one is a right angle adaptor (so Ill have room to install the extender and the 02 sensor) and another one extends the sensor about 4 inches and has a smaller hold to allow less exhaust to reach the sensor.
What I'm debating and the root of my question ( finally he gets to it you say) had anyone else figured out how much reduction you need to get appropriate 02 readings ? I have the option to put in just one small spacer, or two, and will having too little oxygen read also cause a code/CEL ?
Basically wanting to do this once, install the right angle extension or both..
Anyone does this and how much spacing did you provide to lower 02 readings ?
The plan I have is to use two, (top part of image) as you can see the straight extender restricts flow with a smaller inlet.
Talked to Prosport about these for my car. He said they have a 95% success rate and was very honest about them not working on every model car. Great group of guys here. Used their gauges on my turbo notch
My setup is similar to the straight one in your picture but less spaced from the exhaust stream(shorter). On my car, the longer spacer and the L-shaped spacers didn't work out because they spaced the sensors from the exhaust too much IMO so not enough activity from the sensors. I believe I used 2 spark plug defoulers. One per sensor to achieve enough spacing from the exhaust stream. I had to drill out the small opening just so the O2 sensor could screw into the defouler enough to seal against it. I could get a picture of my setup this weekend when doing an oil change. Been running this setup now for almost 2 years and pass emissions without a hassle. This is with 200 cell cats as well.
My setup is similar to the straight one in your picture but less spaced from the exhaust stream(shorter). On my car, the longer spacer and the L-shaped spacers didn't work out because they spaced the sensors from the exhaust too much IMO so not enough activity from the sensors. I believe I used 2 spark plug defoulers. One per sensor to achieve enough spacing from the exhaust stream. I had to drill out the small opening just so the O2 sensor could screw into the defouler enough to seal against it. I could get a picture of my setup this weekend when doing an oil change. Been running this setup now for almost 2 years and pass emissions without a hassle. This is with 200 cell cats as well.
Thanks, I don't have enough room to just put the straight one in due to the location of the bungs, so I'll have to use the right angle. I may try just the right angle first, it has a fully bored out hold so will let more exhaust in, but does remove the sensor from the full exhaust flow. Any idea what readings you should see on the 2nd bank of 02 sensors for a 'healthy' amount of oxygen ? I can data log so If it doesnt work, I'd like to determine are they out of the flow enough, or too far out of the flow..
Thanks, I don't have enough room to just put the straight one in due to the location of the bungs, so I'll have to use the right angle. I may try just the right angle first, it has a fully bored out hold so will let more exhaust in, but does remove the sensor from the full exhaust flow. Any idea what readings you should see on the 2nd bank of 02 sensors for a 'healthy' amount of oxygen ? I can data log so If it doesnt work, I'd like to determine are they out of the flow enough, or too far out of the flow..
I'll check what my readings are this afternoon when I leave work. Any specific parameters? (idle, part throttle?)
I'll check what my readings are this afternoon when I leave work. Any specific parameters? (idle, part throttle?)
Idle would be great, I think part of the closed loop test is to start the car cold and is open loop, and run it for 3 minutes at idle so the cats warm up and the car goes to closed loop and starts using the 02 sensor to vary mixture.
Well you have confused the SOOM---if the wahoo tuner unnecessarly extended the injection time allowing for lots of oxygen in the exhaust what difference does it make if the rear sensor is a foot or ten feet from the cat--- the exhaust is still rich---what did I miss??
Well you have confused the SOOM---if the wahoo tuner unnecessarly extended the injection time allowing for lots of oxygen in the exhaust what difference does it make if the rear sensor is a foot or ten feet from the cat--- the exhaust is still rich---what did I miss??
Front 02 I believe is for fuel trim, rear 02 for cat efficiency, maybe moving the sensors way down stream would work, but seems unlikely at the speed the exhaust gasses move. But this is mercedes so someone else may have more insight.
Got them installed today, hopefully works, ended up using a right angle one and a spark plug non fouler I drilled out. Sorry for the crappie pic, not much room
For anyone planning on this the extenders worked, just got past the not ready monitors and cat and 02 tests passed, and passed emissions test yesterday.
Some food for thought. Last weekend I had my exhaust completed after installing my EC mid headers. I drove 12 miles with primary O2's in headers and secondary O2's connected but zip tied out of the way (open air). No codes during the trip down but once the secondary O2's were place back in the exhaust stream (no primary cats), I got the code. Based in this I see no reason why the extenders wouldn't work.
Some food for thought. Last weekend I had my exhaust completed after installing my EC mid headers. I drove 12 miles with primary O2's in headers and secondary O2's connected but zip tied out of the way (open air). No codes during the trip down but once the secondary O2's were place back in the exhaust stream (no primary cats), I got the code. Based in this I see no reason why the extenders wouldn't work.
02-10-2016, 03:53 PM
