monaro o2 sensor removal
Discussion
vxr2010 said:
Hi all just reserecting an old post , are there only two O2 sensors and they are after the cats , if so who is a good source for them please and is it worth changing them due to age of car , car is a 04 cv8 ls1 , 63 k miles on the clock , cheers in advance
MF keep them. If it ain't broke don't fix it IMHO.Hi an update to an old post , I changed the 02 sensors , car is an 04 cv8 so you only get pre cat sensors one on each side of the exhaust , and no post cat sensors , I thought it we be a pig to do but with a rubber malet and correct size spanner they both came out pretty hassle free , the sensor type there appear to be two types both have four wires , on my car the sensors are all in line and flat , the other tyre is side by side in a box shape these also fit the vxr8 , the car picks up better I wonder if the mpg will improve as much as it did on my forester Sti
I think the stock setup has rear o2s - my monaro already had the rear sensors mapped out and a wortec exhaust fitted when I got it, so I never saw them - yours was probably the same.
Which o2 sensors did you go with? The cheap Denso 2344063 ones I ordered from rock auto wouldn't switch (stuck at 450mV)...put my old ones back in, but I think they're a bit lazy (switching ~2x/sec, not 4x/sec).
Which o2 sensors did you go with? The cheap Denso 2344063 ones I ordered from rock auto wouldn't switch (stuck at 450mV)...put my old ones back in, but I think they're a bit lazy (switching ~2x/sec, not 4x/sec).
I don't think the 04 cv8 ever had post cat sensors I may be wrong , ive been told the post cat are not worth changing any way , I ordered via eBay through pec Australia , they were very well priced , I think all the sensors are slow to show voltage change so difficult to diagnose , but for the cost and the age of the car plus better pick up well worth doing
This is an interesting post..
I was under the impression that if the o2 sensors were faulty they would always throw up a fault code?
Now, if you notice an improvement in pick up buy changing them before a fault code is registered, then that is worth doing.
I'm now tempted to change mine and see if the pick up smooths out.
Any updates will be appreciated.
regards John
I was under the impression that if the o2 sensors were faulty they would always throw up a fault code?
Now, if you notice an improvement in pick up buy changing them before a fault code is registered, then that is worth doing.
I'm now tempted to change mine and see if the pick up smooths out.
Any updates will be appreciated.
regards John
Hi john , I have a forester Sti , no fault code , car was a 2004 , changed front pre cat sensor , car ran better plus mpg Improved a lot , no fault code , i have a bit of kit to read O2 sensor voltage , the voltage was changing a bit on the Monaro but not a lot , it was difficult to work out if they were or were not working , but due to age of the car I changed them any way , the ecu seems to take a while to re learn any changes but car definitely picks up better and is smoother , I would also expect a bit of mpg improvement based on the forester results which was around a 5 mpg improvement
tting the bed, idling around 250rpm and eventually throwing a lean DTC, all because of an o2 sensor. I don't know the techical side of the v8 , I get the feeling 02 sensor input is not as important than on something like a Subaru turbo , but it still has an input to how the ecu and the car runs , I don't know if most tuning on a v8 is based on the maf and not the 02 sensor ? , but 02 sensors do go with time , unless it's shows a fault code then probably not very noticeable decay over time , but in my opinion due to age and mileage worth changing
vxr2010 said:
Hi john , I have a forester Sti , no fault code , car was a 2004 , changed front pre cat sensor , car ran better plus mpg Improved a lot , no fault code , i have a bit of kit to read O2 sensor voltage , the voltage was changing a bit on the Monaro but not a lot , it was difficult to work out if they were or were not working , but due to age of the car I changed them any way , the ecu seems to take a while to re learn any changes but car definitely picks up better and is smoother , I would also expect a bit of mpg improvement based on the forester results which was around a 5 mpg improvement
Thanks vxr2010,My car is due a service in August, I will change them then. Considering how old they are Its not a bad idea anyway.
Thank again John
vxr2010 said:
I don't know the techical side of the v8 , I get the feeling 02 sensor input is not as important than on something like a Subaru turbo , but it still has an input to how the ecu and the car runs , I don't know if most tuning on a v8 is based on the maf and not the 02 sensor ? , but 02 sensors do go with time , unless it's shows a fault code then probably not very noticeable decay over time , but in my opinion due to age and mileage worth changing
FWIW my Subaru is 3.0l NA, but let's not dwell on that. Basically, the o2s control the fuel trims, which correct for inaccurate AFR. gsd2000 said:
I need to remove my monaro o2 sensors, do I need a special tool for it?
Be prepared for the threads to strip on removal, then you will need a thread tap, this happened when Monkfish did mine.Only warning you to prepare for the worst, soak overnight with penetrating oil , it may help.
Give update how you went on.
Ade
vxr2010 said:
Hi an update to an old post , I changed the 02 sensors , car is an 04 cv8 so you only get pre cat sensors one on each side of the exhaust , and no post cat sensors , I thought it we be a pig to do but with a rubber malet and correct size spanner they both came out pretty hassle free , the sensor type there appear to be two types both have four wires , on my car the sensors are all in line and flat , the other tyre is side by side in a box shape these also fit the vxr8 , the car picks up better I wonder if the mpg will improve as much as it did on my forester Sti
Did you isolate the battery for 10 mins + at all? If so the fuel trims would have been re-set in the ecu, and quite possibly the feeling of better pick up due to that????Gassing Station | HSV & Monaro | Top of Page | What's New | My Stuff