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My Subaru Forester 2003 runs fine until I go up steep inclines when it starts to loose power and goes into "limp mode" (ie shut down). I can restart it okay but the same thing happens after a while and especially if I give it too much acceleration up hill. I have had all 4 spark plugs replaced last week.

What could it possibly be please?

Hot oil?

Fuel problem?

Spark leads?

Please help. I'd really appreciate it Helen

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    any codes? Typically an ECU goes into limp mode when it cannot reliably read an important sensor, like cam position or MAP/MAF. – rpmerf Feb 18 '16 at 19:53
  • Are you sure that it is the incline that is causing the problem and not just that you are having to put more than normal load on the engine? If you were to try to accelerate quickly on the flat in a higher gear than normal, would the problem occur then? – HandyHowie Feb 18 '16 at 22:36
  • Are you sure it's limp mode or is the engine just shutting off? I am not aware of any limp modes that shut off the engine. There is most likely a fuel issue like a plugged filter or weak fuel pump. – vini_i Feb 18 '16 at 23:12
  • I've seen some pretty badly maintained/misfiring Subarus and have never encountered limp mode on one before. What's the service history on the car? – Ben Feb 19 '16 at 0:03
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    Are you (or the transmission) downshifting appropriately when going up the hill? Lugging the engine would cause it to stall, and I assume after a restart you (or the transmission) would shift into first. Possibly low transmission fluid preventing the transmission from shifting properly on a incline? – TMN Feb 19 '16 at 15:04

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