I've had my Hawkeye WRX PPP Wagon for a couple of months now and it feels slightly jerky under gentle acceleration when cold. Harder acceleration seems fine but town driving when cold is jerky.

I had a MY05 PPP before this and never noticed anything like this.

I know this is a different engine and fly by wire throttle, but once it's warm it's fine no signs of the jerkiness.

Could it be overfuelling under light throttle when cold, it's fine after about 5mins

 

I sort of know what you are on about, I have an 07 plate STi.

When cold and gently accelerating upto around the 2-2.5K revs there is possible a faint stutter almost. This only happens for literally the first time I touch the accelerator.

G

 

I have this issue on MY06 WRX, had subaru look at it on the 2nd service, no faults found, must be a 2.5Ltr issue

 

i think they all feeling a bit lumpy until up to normal temparature

 

my 05 STi is like this too.

not sure if its overfueliing TBH - smells very 'fumey' when cold!

 

Yep,totally normal.

It's worse when the temperature outside is cooler but i get it on every journey - hesitates for a minute or so under gentle acceleration - soon goes though.

Told perfectly normal by dealer and have read as much on this site.

 

My 06 WRX has this as well, checked twice by Subaru and no apparant faults showing, although they guy who test drove it said there was a definate stutter / hesitation, then the imortal words ' They All Do that '

Mainly when cold but also when up to temperature aswell at times

 

Its the DBW throttle... similar issues on the Yamaha R6 with DBW too so its not just Subaru.

Tony.

 

My 03sti ppp has done this now and again when cold, it's got a throttle cable as well
As Andy-pay said above, it's runs very rich when cold, this could be the issue?

dipster

 

mine to....lol!!

 

I have a MY07 WRX and it does that too.
LMAO do you use Tileys of Bristol, they are famous for saying " They all do that Sir "

Its hardly noticable and nothing to worry about I'm sure, just slight overfuel on cold start.

 

My old classic Turbo 2000 is fumey to when starting from cold in chilly weather and slightly lumpy too, but car not standard. Z4 ECU + a few more mods. Go's VERY well in the cold though, boost and torque noticeably better!! Scooby likes the cold.............

 

My my00 does this eveytime too! just for the first stretch of road slightly off throttle, its like the car missing ever so slightly! then its fixed wierd.

 

I have noticed the same too, glad someone else brought it up.
Phew, its normal. Started to notice it more in the colder weather.

 

me too - get a cloud of smoke on cold start up too, 05 sti. Once its warm, its no bother.

 

Smoke or condensation mate. Big difference, one being normal, one being baaaaaaaaaad!

 

Oh well, glad I'm not the only one!

Come to think of it I think my Blobeye MY04STi did something like this too, none of the rest of my scoobs have had it though.

Maybe an AndyF remap will solve this, something for the future ;-)

 

Definatly a good excuse to get one :P

 

Or sommats gone kerputt

 

well, just kind of blue and smells of petrol, its only done 15k - surely not bad??
isnt it just the over fueling / choke thing when starting cold?

 

May want to get that checked to be on the safe side.

G

 

Old thread but I am wondering if your throttle was scaled when your PPP was fitted ?( Mike Wood could tell you more ?)

 

me 2 on a WRX with a Zen map …. Must be a 2.5 thing …

 

I have PPP and seem the have a flat spot in the mapping around 3.6k. Seems to be common.

Also have a slightly tinny sound ( like a loose heat-shield) between 2-3k which is slightly annoying but nowt to worry about.

CGS