My Trailblazer 2004 gives only 4 Kms/Liter.

Asked by Umair Mar 12, 2019 at 03:50 PM about the 2004 Chevrolet Trailblazer LS 4WD

Question type: Maintenance & Repair

Hye.. My chevy TrailBlazer 2004 model empty outs a tank at aroud 200 miles.
Its a 4.2L V6. I have alredy changed the spark plugs, engine oil, air filter, gear
oil, and i also used GUMOUT fuel injector cleaner. But I couldn't feel any
difference after all of these changes. Can anyone help please..

1 Answer
11,745

FJ4072 answered 6 years ago

Our platform isn't known for the good gas mileage, 200 isn't horrible for these, but cleaning the throttle body will help the most. Remove throttle body with fuses #10 and #28 removed from fuse box while cleaning. Lots of video's on how to do it. 4.2L straight 6 likes AC Delco 41-103 sparkplugs only. Also, a new upstream AC Delco or Denso 02 sensor will help. I believe 04 still has the fuel filter external from fuel pump, new one would be good. Clean your MAF sensor IF it has one, don't recall what year they started using them. OR clean your MAP sensor if MAF is missing near the airbox. If you really want to get the maximum out of the engine, send your PCM to PCM of North Carolina and have it tuned to your liking.

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