Long Term Fuel Trim question
#1
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I would like to get some input on the importance of long term fuel trim readings. I drive a 2002 2.5l automatic with a little over 118,000 miles. I currently don't have any active dtc codes but the P1111. My concern is that the ltft readings have quite a bit of disparity: 6.3 (Bank 1) vs. 3.1 (Bank 2).
Brief history on car: Around 3 months ago, misfires on all 3 cylinders in bank 2. My mechanic confirmed a slight coolant leak into combustion chamber. He re-torqued the bank 2 cylinder head--no loss of coolant and misfires since. P0430 code (catalyst inefficiency) kept coming back, so I installed a spacer between the downstream oxygen sensor and the catalytic converter. Code hasn't returned after this quick fix. In fact, car just passed a strict california biennial smog inspection.
Any response greatly appreciated.
Brief history on car: Around 3 months ago, misfires on all 3 cylinders in bank 2. My mechanic confirmed a slight coolant leak into combustion chamber. He re-torqued the bank 2 cylinder head--no loss of coolant and misfires since. P0430 code (catalyst inefficiency) kept coming back, so I installed a spacer between the downstream oxygen sensor and the catalytic converter. Code hasn't returned after this quick fix. In fact, car just passed a strict california biennial smog inspection.
Any response greatly appreciated.
#2
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No one appears to want to stick their head above the parapet on this one.
The misfires may have compromised the Cat or you could have a borderline downstream O2 sensor on that bank.
If the vehicle was mine and it had just passed inspection, I'd be leaving it well alone with an occasional check on DTC's!![Icon Lol](https://www.jaguarforums.com/forum/images/smilies/icon_lol.gif)
Graham
The misfires may have compromised the Cat or you could have a borderline downstream O2 sensor on that bank.
If the vehicle was mine and it had just passed inspection, I'd be leaving it well alone with an occasional check on DTC's!
![Icon Lol](https://www.jaguarforums.com/forum/images/smilies/icon_lol.gif)
Graham
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love's_jag (07-11-2012)
#3
![Default](/forum/images/icons/icon1.gif)
No one appears to want to stick their head above the parapet on this one.
The misfires may have compromised the Cat or you could have a borderline downstream O2 sensor on that bank.
If the vehicle was mine and it had just passed inspection, I'd be leaving it well alone with an occasional check on DTC's!![Icon Lol](https://www.jaguarforums.com/forum/images/smilies/icon_lol.gif)
Graham
The misfires may have compromised the Cat or you could have a borderline downstream O2 sensor on that bank.
If the vehicle was mine and it had just passed inspection, I'd be leaving it well alone with an occasional check on DTC's!
![Icon Lol](https://www.jaguarforums.com/forum/images/smilies/icon_lol.gif)
Graham
Thanks again for the advise.
#4
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