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|3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.|
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Originally Posted by R_F_L
Oh man. I went to advance auto today and asked if they had the wrench to remove the O2 sensor. They didn't so I bought a regular adjustable wrench and stayed under my car for over an hour trying remove it. I got really pissed and went to my friend's shop and got it out.
I replaced the sensor and took the car for a serious test drive. Though the old sensor was old and worn out, I didn't notice any difference in performance with the new one. I will replace the fuel filter tomorrow and see what happens.
Originally Posted by seven
I had almost the same problem a couple months ago. fuel milage kept getting worse and performance dropped. turned out it was the cat converter. seems the honeycomb stuff inside broke free and clogged the exhaust flow. "cleaned out" the cat and performance was better than ever and fuel milage went right back up about 23 city and 29 to 30 highway hope that idea helps
Originally Posted by starmavin
A 7/8 inch wrench works great. They do sell the O2 sensor sockets. However with out a swivel and an extension, and even then they are not very helpful if it's really stuck.
A dirty maf can cause poor fuel economy symptoms.
P.S. After making any changes you should reset the computer so it'll re-adapt to any changes. Do this by unplugging the computer or disconnect the battery for 30 sec.
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