Ok - I recently got the random misfire and have basically tried everything and no luck! I also have high Fuel trim in only Bank 1 but no code for it is coming up. Current issue: Random Misfire P300 High Short Term Fuel Trim on Bank 1 (+25%) when idling (Bank 2 looks fine) High Long Term Fuel Tr…

Sorry - I forgot to mention I replaced that as well. lol

@George_San_Jose1 Bank 1 is +25%. Long term is 10%.

+10% fuel trim means the computer finds it has to inject 10% more fuel to meet the demands of the O2 sensor than it thinks it would have to based on the other a/f sensors (maf, ect, tps, etc.) You’ve pretty much already replaced the most likely parts suspects. hmmmm … The best clue in your fav…

Thanks @George_San_Jose1 . Today I went under the car again and inspected the catalytic converter. I did notice there was one bolt missing thats attached to exhaust manifold. I tried spraying soapy water and a bubble very slowly started to form where the missing bolt is located. Do you think this…

Personally, I’d be looking more closely at the +25% stft It’s quite substantial

[image] sarvesh.bathija_156605: Do you think this would cause this dramatic of a change in reading? That’s a definite possibility.

eliminate all known intake and exhaust leaks first Do NOT reset the fuel trims After the repair, drive the vehicle for awhile and let the fuel trims stabilize on their own Then report back to us, please

I’ll add something, in regards to intake and exhaust leaks Assuming you don’t have an evap/smoke machine . . . few diyers do . . . there is another way to help find those leaks At idle and with the scanner hooked up, spray carb cleaner at suspected areas, such as intake gaskets. If you see the fu…

2006 Nissan Altima V6 Random Misfire and High Fuel Trim - Big headache! Will buy beer! :)

Maintenance/Repairs

George_San_Jose1 August 25, 2019, 1:31am 4

Please clarify: Is the short term fuel trim on bank 1 negative 25%, or positive 25%? What’s the long term fuel trims when idling the warm engine?

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2006 Nissan Altima V6 Random Misfire and High Fuel Trim - Big headache! Will buy beer! :)

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