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Old 02-21-2009, 04:04 PM   #1
tommyadrian5
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Default Need Help. 2002 Tahoe Several Problems


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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.
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Old 02-21-2009, 07:12 PM   #2
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For your first problem you probally need intake gaskets. Very common problem and your description fits it to a tee. You may want to post this in the proper section though this is for 2007+ truck people with the same year most likely can help you better
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Old 02-21-2009, 09:28 PM   #3
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Intake gaskets x2. Very very common problem on these trucks had mine replaced at 75k. 2nd prob im stumped sorry i couldn't be more help.
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Old 02-22-2009, 02:37 PM   #4
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Can i get a price estimate of how much to do this? Just so I know what to expect when i take it in?

Thanks for the help.
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Old 02-22-2009, 02:42 PM   #5
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Honestly the intake job is one a fairly mechanically inclined person can do. I also agree with the intake gaskets.

Your second issue reads like a bad hub bearing. Also an easy fix.
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Old 02-22-2009, 02:47 PM   #6
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Thanks for both answers?

So I should be getting an intake manifold gasket and wheel hub assembly?
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Old 02-22-2009, 02:53 PM   #7
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There are nore tests needed to be done by a person that can read and interpret the scanner values. There is also one test you can do to check your intake gaskets. Using a can of carb cleaner, you can spray around where the intake bolts to the head. What you will be listening for is a change in idle.

The hub bearing. when you make a right turn, do you hear the sound on the left? Make a left turn, do you hear it on the right?

The problem bearing is on the opposite side youre making the turn
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Old 02-23-2009, 04:50 AM   #8
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yea had the same problem with the grinding, new hub assembly did the trick
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Old 02-23-2009, 08:30 AM   #9
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fix the hub bearing first before your wheel falls off like mine
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Old 02-23-2009, 10:28 AM   #10
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TnHoe, you got pics of that?
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