Chevrolet TrailBlazer Forum : “check engine light comes on when down to 1/4 tank and goes off at 3/4 tank. Als...”

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jorf

12/13/2008, 2:28PM

About: 2003 Chevrolet TrailBlazer LT

check engine light comes on when down to 1/4 tank and goes off at 3/4 tank. Also Revs very high.

I have a chevy trailblazer that the check engine light comes on when down to around 1/4 tank of gas and then after refuel goes off when it is 3/4 tank full. It also revs very high while driving, then it goes back to normal. Any ideas?

Danny1386

12/14/2008, 12:31AM

given that you mention the high rev while driving and variations in fuel tank levels

my guess, but I am not positive, may have to deal with something in the evaporative emission system

Adam4753

12/14/2008, 12:54AM

If the light is staying on until you fill back up, then stop by a parts store and get the code read...

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