- Joined
- Nov 20, 2024
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Original owner of a 2016 Legacy with more than 200k on it. Hoping to get another 200k!
All was going great until the engine sputtered a few times.
Once from 3k down to about 1k... sputtered (coughed), the next time was about the same.
MPG went down about 4-6 mpg. Mostly 55-65 mph driving avg was 34 and dropped to 29. Even worse with recent cold.
Most everything was original except spark plugs.
No CEL.
Engine still running smooth just using a lot more gas.
Replaced fuel pump, coil packs, PCV, Both O2 sensors, MAF, throttle body.
(most replaced with OEM parts from Rockauto)
Last thing replaced were the injectors.
P0172 now popping up at idle or when warming up (not all the time) - engine still running smooth when accelerating.
Checked plugs - All have are blackened but not heavy or wet deposits.
I'm not into just replacing parts but figured if keeping for the long term, I would need to replace them anyways.
I performed idle relearn after part replacement but some issues.
After picking up an scanner I noticed the strongly negative short and long term trims.
Long term is mostly at -25 to -15 at speed. Short term will get above 0 at times.
Any suggestions would be greatly appreciated.
I attached the latest freeze frames for insight.
All was going great until the engine sputtered a few times.
Once from 3k down to about 1k... sputtered (coughed), the next time was about the same.
MPG went down about 4-6 mpg. Mostly 55-65 mph driving avg was 34 and dropped to 29. Even worse with recent cold.
Most everything was original except spark plugs.
No CEL.
Engine still running smooth just using a lot more gas.
Replaced fuel pump, coil packs, PCV, Both O2 sensors, MAF, throttle body.
(most replaced with OEM parts from Rockauto)
Last thing replaced were the injectors.
P0172 now popping up at idle or when warming up (not all the time) - engine still running smooth when accelerating.
Checked plugs - All have are blackened but not heavy or wet deposits.
I'm not into just replacing parts but figured if keeping for the long term, I would need to replace them anyways.
I performed idle relearn after part replacement but some issues.
After picking up an scanner I noticed the strongly negative short and long term trims.
Long term is mostly at -25 to -15 at speed. Short term will get above 0 at times.
Any suggestions would be greatly appreciated.
I attached the latest freeze frames for insight.