Question about 2003 Chevrolet Tahoe
Check engine light on and had bad gas mileage. I changed all four oxygen sensors, still giving code. I was told to change mass air flow...still giving code. Checked plugs all okay. Now light still on and my Tahoe is not idling properly and dies when i come to a stop. Runs better in warmer temperatures. Heater does not work when I am running at low rpm. It will only blow cold air. When I drive faster it warms up. Need Help Please!
If you have looked up the code and it tells you the vehicle is running lean and you have changed the O2 sensors, you may have a clogged fuel filter or worst yet a fuel pump that is going bad and not providing enough pressure. Take it to a repair shop and ask them to test the pressure. It is an inexpensive test that will only take a couple of minutes. If the pressure is low try replacing the filter first as it is much cheaper than replacing the fuel pump that is in the gas tank.
Posted on Jan 15, 2013
Possible reason for heater problem could be low coolant level. or possible plugged heater hoses. check thermostat, which can affect lean condition and lack of heat. vacuum leak can effect idle performance and cause lean condition, also exhaust leaks or low fuel pressure can also be a factor. best is to take vehicle to auto repair shop to have it diagnose..
Posted on Jan 15, 2013
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Posted on Jan 02, 2017
SOURCE: I have 2002 chevy avalanche,
Mine did the same thing...at 42F degrees, run bad. After it warm up, it would be fine. This would only happen in the winter. It would throw a code saying it was lean in Bank 1 or 2.
The issue is a contraction of the intake gasket due to the cold weather, when it contracts, it leaks air. There is a new, improved gasket now from GM, or get a Felpro from major auto stores and it will work fine. I consistently had the problem every winter, and this has fixed the problem for the last 3-4 years.
Posted on Apr 14, 2011
SOURCE: my 2004 chevy 1500 is
Sounds like you have a bad vacuum leak. Check all hoses and the intake manifold. Not saying this is your problem , but I just replaced a plastic intake plenum because the converter was clogged and when the egr valve kicked in it melted a hole threw the plenum. And ofcourse this car ran like ****.
Posted on Jun 26, 2011
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