Question about 2003 Chevrolet Avalanche

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03 avalanche running very rough shaking no power

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Sounds like you have a bad plug or a plug wire. It could also be bad gas, but the plugs would be the first thing major I'd check. It will skip and loss of power along with it.

Posted on Feb 01, 2010

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Posted on Jan 02, 2017

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2003 chevy avalanche newer spark plugs black n idles rough


Check for vacuum leaks. Leak causes O2 sensors to sense too much air, then computer tells injectors to run full rich to compensate.

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Take your car for a compression test to see if there is any vacuum leak causing the engine to run rough. Also, this could be due to a bad MAF sensor or an O2 sensor. If the check engine light is ON, you should better get the codes read.

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2002 avalanche forums


I assume the check engine light is not on.
In addition to the ignition system, it could also be a fuel problem.
Fuel pressure or filter problems, or a worn throttle position sensor.

Jul 03, 2012 | 2002 Chevrolet Avalanche

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No power battery new


The Avalanche are famous for the dead battery of not driving for 30 days, Your ECM and various module has a parastatic draw that is normal for you vehicle.You also have the ignition problem. Even though you turn off the ignition remove the key the ignition draw power and this has been a porblem with your year make and model You will need to replace the ignition switch Here is the TSB Bulletin No.04-06-03-002.

Feb 27, 2012 | 2002 Chevrolet Avalanche

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03 avalanche z71 reduce engine power came on whats the cause


Did your check engine light come on? To really determine the issue you need to hook a scanner up to your vehicle and pull the codes. Once you know the codes then you have the information for a diagnosis.

Jan 15, 2011 | 2003 Chevrolet Avalanche

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Car violently shakes when I start moving and stops shaking when it kicks into second gear (automatic transmission). It also shakes a bit when coming to a complete stop and it jerks front and back if...


A lack of power or a vehicle running rough can caused the vehicle to "shake" and also a broken motor mount or transmission mount can cause the problem.
If it's running rough it could be because of one of two fairly common problems. One is a leak in the air duct between the air filter and the throttle body. The other is a leak from rubber hoses connecting the intake to the PCV valve at the crankcase causing a vacuum leak. More serious problems such as a misfire from a bad coil pack or a blown head gasket can also cause the vehicle to lose power and run poorly but these are not as common.

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We have 03 avalanche,no power to fuel pump,checked relay ,swaped it out,fuse also good?????????


there is a wire harness above the tank and are known to go bad they give you a new one when you buy a pump from napa maybe its corroded

Apr 29, 2009 | 2003 Chevrolet Avalanche

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I would have someone check out the rotors for you.

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Power window failure


an avalanche is a Chevrolet not a dodge

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