e110at

Well after finding out that one of the plugs was a grade 6 and the others were grade 7 I changed them all to 7s and the cars spluttering at high revs was cured, so I thought.

Trouble is when the car is running cold it goes great no hiccups it's just when the car is fully warmed up it starts to spit/splutter at high revs again, even sitting at traffic lights I can feel the revs bouncing slightly?

As I say on cold runs fine just when warmed up, I checked the coilpacks no cracks or splits, an I using right grade of plug?

Any help would be appreciated

krazycrab

iTrader: (5)

Without trying to sound morbid you may have a problem with scorching on top of one of the pistons i had the same on a 94wrx last year,When cold the extra fuel hides the problem but when everything up to temp and fuel leaned out the problem becomes more apparent, piston number 3 (i think) nearest the turbo is the most common culprit remove the plug and get a camera down there and check for signs of det, scorching or even worse on mine there was hairline cracking,
Hope this is not the case for you and just something simple but worth checking out buddy

e110at

Thanks for the heads up, hope it's not but I'll get it checked

the hamster

iTrader: (7)

sounds like the coilpack or leads breaking down. Failing that, you have a lot of carbon buildup in your engine which is causing it, but I doubt that.

Start with the obvious, change the coilpack and leads.

e110at

Where is the best place for coilpacks and leads its s 95 wrx?

krazycrab

iTrader: (5)

coil pack and lead comes as one on that year bud and they are around the £75-£80 each for new ones which is the only way to go really you will need a set of four dont be tempted into getting the cheap ones off ebay as they are crap bud, Would be more use finding someone local with good packs and trying them on urs first,

krazycrab

iTrader: (5)

scooby clinic is a good place to try their packs are very good and have given proven results on many occasions and seem to outlast the oem ones too

alcazar

iTrader: (2)

e110at: what model year and what mods, mate?

e110at

It's a 95wrx, straight thro s/s blitz r spec exhaust, s/s headers, Ngk 7 plugs, doluck panel filter, I have walbro fuel pump to fit and 440s I was thinking of fitting???

Tidgy

you will need to get it mapped then

e110at

Does that mean buying a mappable ecu? Am I right in saying the 95wrx ecu can't be mapped??

Tidgy

you can get a esl daughterboard fitted.

If you get a reputable tuner to map it they shoudl be able to fault find, with the help of the mapper to trace exactly where the fault is.

the hamster

iTrader: (7)

With that lot on already it should have been mapped, you shouldnt really just bolt stuff onto an impreza without getting a map to support the mods. Filter, headers and exhaust will all be making it run leaner, especially with no pump.

SLAB

iTrader: (77)

use new age coils m8 easy to convert and your problem will be solved

Jolly Green Monster

iTrader: (4)

problem sounds more fuelling related..

maf, inlet pipe split, fuel pump failing, fuel pressure reg, split in cam breather pipes etc