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Hi and Thanks in Advance for any help or advice.
I have a 2002 Tahoe LT (5.3Z-Flex Fuel) with 95,000 miles which has been having a few issues lately.
1) Cold Start (<45 degrees) Rough Idle and Code P0300. When starting the car in cold weather it first revs up to 2000-2500 rpms for a few seconds, then drops down to 500 and idles very rough, nearly stalling but never actually cutting off. I often get a flashing SES light and code P0300. If it drive the car away the code goes off, and once the car warms up it idles and drives fine. I recently replaced both cats as I was getting cat efficiency low codes, that problem seems to be solved. I am occasionally getting a low voltage for bank 2 sensor 2 O2 sensor. I replaced bank 1 sensor 2 a while ago and have 3 new ones to replace the rest but haven't done it yet. Any ideas what could be going on? Could one bad O2 sensor be causing this. Why would it go away once the car is warm. Could it be dirty injectors? I use chevron techron fuel injector cleaner occasionally but doesn't seem to help.
The fuel filter was replaced prior to this winter, it did not used to do this, could they have put a bad or wrong fuel filter in? Dirty MAF?
2) Grinding noise from front wheels. I have recently been hearing a grinding noise from my front (left) wheel. It comes and goes, but when very cold is somewhat constant. It is also more apparent going around corners at highway speed. There is also groaning when braking at full wheel turn. Is this a wheel bearing? I have had 22's on the car for its whole life. The braking system was tested and checked out fine. It also has been having a problem with the ABS kicking in for no reason while parking but i think there is a TSB about this having to do with corrosion on the sensor.
ANY Ideas? THanks so much you all are great.