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2007 GMC Sierra 2500HD - Page 8 Questions & Answers
2007 gmc duamax Random miss-fire/no codes
Run a compression check to ensure it is not mechanical, i.e. ring crack etc. Hook up to a scan tool and explore missfire monitoring via live data. Answer should lie within one of the afore mentioned.
Check engine light comes on when using fuel with ethanol...what can I do?
Up to 10% should not cause any problems like check engine lights. If this is a flex fuel car then you may have a fuel type sensor, this device senses what % of the fuel is Ethanol and makes adjustments to the engines fuel and ignition system operational strategy, if this fuel sensor is not working correctly the result of the Ethanol burning with no computer adjustments being made for the less dense fuel it will case activation of the CE light due to erratic O2 sensor codes in the exhaust stream.
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