B4 RSK

[Guest]

Hi my new Legacy is a bit jumpy from cold but ok when it warms up, any ideas what would cause this?

[Guest iceboychch]

its cold.. lol

[Guest]

What do you mean `jumpy`?

[Guest Rugged_RS]

LOL as in touchy? as in.. cold?

[Carbon]

Cold oil, cold intake, cold turbos, cold engine. Its cold :-)

Mine always takes a few k's to warm up, just dont push it hard to warm it up faster, thats where your mechanical damage will come in.

[Guest]

Sorry I'll be more specific, when the engine is cold for the first few KM's the acceleration holds back and the Car does not accelerate smoothly, ie Car hesitates and is "jumpy". Is this just a Subaru trait? Surely not.

[Guest Rugged_RS]

Are you giving it any boost? Or is it still on vaccum??

And how quickly are you stepping on the gas? Smooth?

[Guest Builda]

Sounds pretty normal to me. I have to go uphill from home and have to balance the accelerator just right otherwise you get a surging feeling. As soon as temp comes up all sweet. Dont really notice it on flat cold starts though.

[Guest]

I personally wouldnt hit boost in a cold car. I always wait until the engine is at full operating temperature until i give it a bit of boost.

If the problem goes away after the car is warmed up, then its probably just because its cold. But you could change the plugs and wires or even fuel and see if that helps.

[_rsk_]

Yep it's a normal Subaru trait. My MY00 B4 RSK does the same. So does mate's MY97 WRX.

[D-Style]

All my subarus have done that. Just drive like a nana untill it warms up.

[EJ20T]

depends on how bad it is, my old BF5 was really bad some times, at partial load, and slighly accelerating on the warm up cycle. my current BH5A has been getting bad latley even when warm and has pulled a stepper motor code. driven other early GTB/RSK's and i think stepper motor problems are common.

[Guest]

Been into the Garage today, apparently it's the Oxygen sensor which was replaced, notorious for failing apparently. Now have much better performance also.