Quote:
Originally Posted by steve99
usually if the washer is loose its not in all the way and it may be leaking.
I had to chase the threads on my ofh ( same with many headers as when the bungs are welded in they distort a bit) to get the o2 sensor to screw in properly without forcing and so they go in all the way. Even a small leak right near the sensor will cause issues as the sensor sees fresh air with heaps of oxygen and it thinks car is running lean when its not.
If you have not removed the front 02 sensor I would do so then run a tap/chaser through bung then reinstall sensor its M18 by 1.5 pitch
if the sensor is not screwed in all the way it wont work properly either.
check the threads on front o2 sensor for damage as well.
luckly you can get at the front 02 without uninstalling header
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Alright, I'll check the primary o2 sensor on Saturday. I may have to buy the chaser. The sensor looks and feels screwed all the way. I need a wrench to loosen the primary o2 sensor. I just really hope the front o2 sensor is not damage. These sensors are dang expensive. How would I be able to get to the front o2 sensor? Just take off the whole intake?