Moderator: volvite
Drive it onto some ramps, so you get more space. Also, spray the threads with WD-40 or equivalent and let it soak. I don't know if the OEM have anti-sieze coating on them or not. If it's super tight, loosen and tighten so it breaks all the carbon off and again, lube it.disallow wrote:Hey all,
So I went to the local surplus tool store (princess auto) and purchased 2 o2 sensor sockets as well as a thread chaser.
Any pointers for me before I take a crack at replacing the primary o2 sensors (also called Fuel/Air Sensors) tomorrow?
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I read the voltages off of my Superchips tuner, and they are reading lean. I can definitely tell that the truck is not running lean (exhaust smells of unburned fuel before cats heat up), and I am experiencing poor fuel economy. I do not have any CEL or codes.Tech wrote:why you replacing?
I'd go from the wheel well. Take the front wheels off and go from the inner fender liner. You can bend it or remove it. The connectors also clip into little metal tabs. Unlock the grey tabs FIRST, or if the tab breaks, the connector wont stay secure. The sensor won't be hard to get out, after the first crack, the should spin out pretty easy. On one hand it helps if its warm, but on the other, if you haven't done them before, you run the risk of burning yourself....
What is the normal voltage I'm supposed to be seeing? Are they supposed to be different on Bank 1 and Bank 2? Per my earlier posts, I get 0.3v on bank 1, and 0.6v on bank 2. To me, this points to an issue with the way the sensor is reading.Tech wrote:Those trucks are known to be smelly after cold start. Keep in mind that the voltages for A/F sensors are not the same as O2. I've yet to replace an A/F sensor in a Pathfinder for anything other than physical damage. Feel better!
I agree. And the voltage readings are pretty stable. Its the trim values that are wacked. Without a proper baseline, I really don't know what they are supposed to read, but they are really all over the place.Captain Smoke Eater wrote:I watch your videos of you showing the readings. I would sudjest cleaning your fuel injection system first before changing parts out. Reason Im sayting this. If you have a weak/cloged injector on bank 1 it will show leaner numbers on that side, even though the emc is increasing fuel parameters for that side. Your sensor might be showing you the correct readings. Most of the time when a sensor is going out it reads waky numbers out of the norm then goes back to normal readings till it finally breaks.