My Forester MY04 XS (NA auto) is quite sluggish when going up a hill. I replaced the A/F O2 sensor a year ago and also the rear muffler which was blocked. The engine runs and idles fine, it just doesn't seem to have enough grunt when climbing.
I had a recent service including a full computer scan which found no faults. The only issues found were the battery has 2 bad cells and needs changed, also the spark plug seals are leaking as there's oil on the plugs.
Could the battery or plugs affect performance? Or what else can I look at?
I believe this model is MAP so there's no MAF sensor to clean or replace.
Thanks
I had a recent service including a full computer scan which found no faults. The only issues found were the battery has 2 bad cells and needs changed, also the spark plug seals are leaking as there's oil on the plugs.
Could the battery or plugs affect performance? Or what else can I look at?
I believe this model is MAP so there's no MAF sensor to clean or replace.
Thanks
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