Question about 2005 Chevrolet TrailBlazer

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Everytime I use fuel with 10% Ethanol, check engine light comes on and runs a little rough? Is this normal?

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  • brease03 Mar 08, 2009

    I have tried different stations. Same results. Fortunately, there are still plenty of Ethanol free stations in my area.



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Yes it could,depending on type of gas,but usually its more because of the **** build up in some gas station tanks,try same gas elsewhere!

Posted on Mar 08, 2009


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How much alcohol (% in 87 octane gasoline) can I run in my 1998 Dodge Caravan without installing a conversion kit and without causing harm to the 3.3L engine with automatic tranny. It has 185000 miles and...

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Engine code p0420 on 2002 Chevrolet Express Van V8


the code you speak of relates strictly to the catalytic converter. it is possible there is a faulty sensor, however that choice is highly unlikely. Catalytic converters carry a 5/50 7/70 and 8/80 warranty depending upoin the state you live in...this may be a repair covered under manufacturers warranty. this code is becoming very prevelant in many auto lines as a result of the insurgence of ethanol dilution of our fuels. the "10%" ethanol sticker is located on most pumps. Most vehicles on the road today are not flex fuel capable and this ethanol is wreaking havoc on our fuel and emission systems, especially the catalytic converters. the converters are caked with deposits from the ethanol, reducing its effeciency. if your have access to well worth branded products (not available in ANY parts store, typicaly dealers and repair shops only) try adding on succesive tank loads of fuel their product called Octi-Plus. this products helps remove ethanol products, and very well may save yoiu big $$$ for that converter repair bill...i hope this helps..check out this link....

ps i appreciate your 4 thumbs up if this helps you!

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