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tnt3

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tnt3 Enthusiast

tnt3

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I have an 04 chev silverado 69000kms. I ran a check for errors and the code I recived was PO 171 Fuel Trim Bank 1 System too Lean the other code was .P0300

Random/Multiple Cylinder Misfire Detected. Can some one explain this to me and what I should do it sounded like a vacum leak at the top of the intake close to fire wall.

tnt3 Enthusiast

tnt3

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Thanks for anwsering I believe it says bank 1 does that help?

Check the injectors and the rail on the driver side. Which Cylinders are misfiring?
tnt3 Enthusiast

tnt3

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Well

I took my truck to Chevrolet dealer in my area adn they scanned the Computer. Replaced the front left O2 sencer adn recalibrated teh other 3 sencers as per GM update. Cost $436.90 Total. 1 Hrs diagnostic $75 O2 Senser $214 1 Hr to instale dn calibrate $75 plus taxes to the man. Truck is working fine so far no I will change oil incase gas washed into the cylinders. Hope this help any one else.

my 04 does the same thing w/ 44K miles....no codes though

 

I would check the rails and connections.

pm26 Senior Enthusiast

pm26

Posted
Posted

To help prevent future oxygen SENSOR contamination, avoid no name brand cheap gas. Stay with name brand stations. I would try to avoid all gas containing ethanol, even less than 10% if you can. Ethanol contaminates oxygen sensors, unless they are specifically designed for it.

tnt3 Enthusiast

tnt3

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I run nothing but supreme gas in my truck the highest octane 91%we can get in Canada

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