kifferarri
Well-Known Member
- Joined
- August 16, 2009
- Messages
- 102
- Reaction score
- 1
- Year, Model & Trim Level
- 02ExplorerXLT 87MustangGT
By disconnecting the battery, you will be clearing the trucks "learned memory" on how it should run. It will reset to a factory default, and very quickly relearn. If you do not do that, it can take a VEEEEERRRRRY long time to change, and relearn new parameters. After doing a fuel filter, there is always a chance that you may have changed the way fuel is getting to the engine, and therefore changed the fuel trims. A very common practice at the time of doing tune-ups (plugs, fuel filter, fuel injector system cleaners) is to use the scan tool, and reset the KAM (Keep Alive Memory, or "learned memory) and allow the computer to quickly relearn, and run properly with proper fuel trims (improving gas mileage).
Now I'm not saying this is the silver bullet your looking for, but it also would not hurt. If you have access to a scan tool, I suggest clearing the KAM. If not, you can disconnect the battery for a few minutes, and that will clear the KAM. (As suggested by esclamada and number4)
Another point from your last post, timing chains can/do/will definitely have an impact on EFI. Being out one tooth one way can cause a lack of power due to timing being over retarded, or have horrible fuel mileage due to being over advanced. Just another piece of food for thought.
Now I'm not saying this is the silver bullet your looking for, but it also would not hurt. If you have access to a scan tool, I suggest clearing the KAM. If not, you can disconnect the battery for a few minutes, and that will clear the KAM. (As suggested by esclamada and number4)
Another point from your last post, timing chains can/do/will definitely have an impact on EFI. Being out one tooth one way can cause a lack of power due to timing being over retarded, or have horrible fuel mileage due to being over advanced. Just another piece of food for thought.