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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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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I assume the check engine light is not on.
In addition to the ignition system, it could also be a fuel problem.
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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?????????

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