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ayeung74

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Everything posted by ayeung74

  1. I recently replaced by timing belt and also changed out the serpentine and ac belts just as a matter of convenience. These were simple aftermarket belts I bought at Autozone. AC belt now has a loud squealing noise that occurs in the morning or has sat around for a few hours. The belt squeals and gets louder when I turn the AC on and it also gets louder when I step on the pedal, but eventually stops after a few seconds. The sound is horrible and loud. Where did I screw up? What is causing this? And how can I stop this---it's really loud and annoying, but more importantly I don't want to damage my car.
  2. Bigrick--(nice, is this a euphemism?) From what I have read on the forums and elsewhere--I also have friends that have installed Bosch sensors on the pre-cat side sensors--and they do "work". They will do the job, but based on the differences between the AFRS and a regular O2 sensor, it would probably not run as efficient. Also, there is the difference in the heater element, O2 sensors need to be heated and the AFRS needs to be heated more rapidly and to a higher temp because they need to reach operating temp quickly since they are the ones that read and detect the air/fuel mix. The rear sensors do not need to be heated as quickly and as hot and only serve to detect exhaust emissions. So basically. you can get by with a Bosch sensor, but it would probably be better in the long run to use an AFRS than an O2 sensor. Brand is not really the issue, only the type. I know that Denso makes AFRS for the Lexus.
  3. I did a lot of reading on the forums and people have used different sensors (both AFRS and universal O2), Densos and Bosch and others (like SNK or Walker). I was reading on the forums about the differences between the two and although they both essentially do the same things, there is a subtle difference between the two. What distinguishes AFRS from regular O2 sensors is that the AFRS is what is known as a wide range O2 sensor whereas the basic O2 sensor is a narrow range sensor. It can detect a wider range of air/fuel ratios than the basic O2 sensor. Also, the AFRS has a little bit more circuity to enable it to detect more minute variations in the exhaust system air content (more sensitive than the O2 sensor). Therefore, it is able to make better adjustments theu the ECM to add or subtract fuel to produce a better mix of air/fuel to maximize efficiency and minimize emissions. hope that helped.
  4. I need to replace my air/fuel ratio sensor (Bank1/ sensor1), but I want to make sure I get the right part because I am not sure if I have to get a specific AFRS like the DEnso part that I saw that sells for around $200. I also saw universal O2 sensors (before catalyst) that sells for alot less. Bosch sells a O2 sensors (part# 13354 and 15734-universal) , but I wasn't sure if it could be used in place of the AFRS. What is the difference and is it essential to have a specific AFRS? I don't want to spend an extra $100 if I don't have to. I've seen lots of posts about oxygen sensors, but I haven't found info about the actual part I can use. Can someone let me know?
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