J4CKO

iTrader: (1)

I remapped my Saab 9-3 Aero yesterday and now it has started stuttering, low down its ok and if you let the boost build slowly and then let it go to the redline it seems ok, any thoughts ?

jaytc2003

iTrader: (1)

sounds like an ignition problem to me

RS Grant

Yea, possibly a dodgy plug/lead... did you change any of them before remapping/raising the boost??


Cheers,
Grant

J4CKO

iTrader: (1)

No, was planning on doing it this weekend with the oil change, so will change them then, all points to coil packs or plugs, will do it in order of cheapness !

jaytc2003

iTrader: (1)

maybe change the gaps on the plugs (or if they need changing anyway) just sounds like they cant cope with a straight on off scenrario (rapid boost build up instead of progressive)

J4CKO

iTrader: (1)

It certainly feels quicker when it isnt stuttering, feels like the car it should have been from the factory. Its meant to be 250 bhp/280 torques, would like to be able to use them properly, its amazing how quickly it accelerates compared to before, I dont know how you lot with 300 or more bhp cope, would be too quick for me !

mattbeef

if its anything like the VAG 1.8T it could be a split boost hose and or dump valve diaphragm

projectsubaru

Was the coilpacks on my scooby when i had prob like this.

j4ckos mate

have you sorted it yet jacko

J4CKO

iTrader: (1)

No, not yet, can be driven ok, its only when you boot it from low down, have ordered some plugs as Halford and the local car shop dont have them, will just go through each suggestion, starting with the cheapest.

Doesnt appear to have any leaky hoses.


It seems to be around when it would be under the highest boost versus least revs.


I was wondering whether a dump valve could cause it, i.e. with the increased pressure its blowing past the o/e cheapo, that said it will go past this point ok.

Weak wastegate spring ?

Is looking like Coilpacks though

Fuel filter or pump, dont think so as once its over the stutter it seems to rev fine so that to me suggests the fueling is ok.

Anyone know of a diagnostics place in Cheshire that understands turbos as to be honest I find it frutrating explaining how my car works to the local garage as they listen on looking confused.

Eddie1980

Oh its not just me that suffers that problem with some garages!

J4CKO

iTrader: (1)

Nope, not just you, it happens with other stuff like Electronics, there is such a wealth of info on the net these days, its easy to pick up a lot of knowledge, perhaps not that practical some of it but it does give you an understanding beyond some so called experts.

sti-04!!

Who remapped the car ? Maybe a problem with the software ??

J4CKO

iTrader: (1)

Its a BSR 'PPC', its a standard off the shelf map for the car, a bit like a Bluefin, you plug it in, it uploads a map and off you go (supposeldly), generally very reliable, 210 -> 247 bhp.