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SVTPerformance's Chain of Restaurants
Tuning À la carte
STFT and Misfire Codes
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<blockquote data-quote="SteveWK" data-source="post: 16018124" data-attributes="member: 139323"><p>Hello All,</p><p></p><p>I hope you don't mind me posting this here instead of the 2013 GT500 forum. It is ECU related though.</p><p></p><p>I have a 2013 GT500 and several months ago I removed the longtube headers and put the stock exhaust back on. Since then I have been getting random misfire code P0300 and hard misfires on a variety of cylinders P030X. I have been data logging trying to figure out what the problem is instead of throwing parts at it. Tonight I noticed while the CEL light is flashing during misfire both bank1 and bank2 STFT peg at 0% and return to normal operation when the misfire clears. The STFT remain at zero even when I give it throttle while the CEL light is flashing.</p><p></p><p>I have performed a crank relearn and loaded the stock tune. Neither made a difference. Also, tomorrow I will be checking to see if the left and right O2 sensors are plugged into the right side. I didn't do the exhaust work. </p><p></p><p>Is this something the ECU does when certain variables are exceeded or does this point to a problem with my O2 sensors? </p><p></p><p>Thanks for your input.</p><p></p><p>Steve</p></blockquote><p></p>
[QUOTE="SteveWK, post: 16018124, member: 139323"] Hello All, I hope you don't mind me posting this here instead of the 2013 GT500 forum. It is ECU related though. I have a 2013 GT500 and several months ago I removed the longtube headers and put the stock exhaust back on. Since then I have been getting random misfire code P0300 and hard misfires on a variety of cylinders P030X. I have been data logging trying to figure out what the problem is instead of throwing parts at it. Tonight I noticed while the CEL light is flashing during misfire both bank1 and bank2 STFT peg at 0% and return to normal operation when the misfire clears. The STFT remain at zero even when I give it throttle while the CEL light is flashing. I have performed a crank relearn and loaded the stock tune. Neither made a difference. Also, tomorrow I will be checking to see if the left and right O2 sensors are plugged into the right side. I didn't do the exhaust work. Is this something the ECU does when certain variables are exceeded or does this point to a problem with my O2 sensors? Thanks for your input. Steve [/QUOTE]
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SVTPerformance's Chain of Restaurants
Tuning À la carte
STFT and Misfire Codes
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