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pretty bad
Typical Repair Cost:
Average Mileage:
119,303 miles
Total Complaints:
1 complaints

Most Common Solutions:

  1. needs new intake manifold gasket (1 reports)
2004 Chevrolet Avalanche engine problems

engine problem

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2004 Chevrolet Avalanche Owner Comments

problem #1

Feb 062012

Avalanche Z71 5.3L

  • Automatic transmission
  • 119,303 miles


2004 Chevy Avalanche Z71 (4wheel drive) 5.3L V8 Engine.

Bought the car in the fall 2011 with 192,000km on it. Was in very good shape all around. Passed emissions test no problem. Took in for check over after noticing drop in horsepower and fuel mileage and it it has an Intake Manifold Gasket leak which GM's are known for. You would think GM would have fixed the problem as in the all the v8's they had in the 90's had the same problem too, not to mention many other engines & cars.

It runs well, and the emissions report shows very good. (E-test was done months before leak was discovered)

-------------------- For potential buyers a warning:

This era of 1999-to at least 2004 model Chevy trucks / avalanches have a problem with Window regulator switches going ($100 a pop), the dashboard clusters on avalanches had a major all the little motors have to be taken out an replaced and recalibrate int eh gauge cluster. Lights burning out in dash radio, back speakers blew out completely. (apparently many cobalt's and newer small GM cars radio speakers just disintegrate and go to crap after a short time (talking pre- gov. bailout era cars , dunno about after) I also had a problem with the 4x4 drive putting it into gear but the truck i bought had a 600cca battery in it and although that is the recommended size it does seem a small # of Cranking & CCA for a v8 with electrics as much as it i went out and put in a new 850cca the windows go up faster and the 4x4 kicks in and out fine. It has the electronic buttons , not like the old 93,94 type with the shift on the fly lever. So maybe it was getting quite enough voltage....i suspect the battery was a bit older. I feared that it may have been the 4x4 encoder motor which apparently is a common thing to go on this car.

Check out this shows some other Reliability stuff on this truck

- , London, Ontario, Canada

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