b3nmw

I've got a 53 plate blog eye uk Sti. When I accelerate hard the car surges from 3000rpm to 5000rpm in all gears. What is the likely cause of this?

rob84

iTrader: (5)

what fuel are you running mate ??

Dan-

my friends blob does this, only a wrx tho but i know he uses 95 ron fuel!

b3nmw

Shell v power. Always

b3nmw

Right fuel used any other suggestions?

blackpoolrock

is it surging or dropping boost ?

ScoobyDoo69

iTrader: (17)

Haven't fitted a big induction kit with no remap have you?

Matt2732

iTrader: (1)

Boost control solenoid maybe needs a clean?

blackpoolrock

sounds like its dropping boost !

b3nmw

Car is relatively standard with only a ninja back box and dump valve of which I don't no the make. I have owned the car for 2 years and these mods came with the car. Def surges from 3k - 5k. Thanks for advice.

overboostUK

I know you say it surges, but is it violent, light, quick, slow surges?

b3nmw

Surges quickly across rpm but car doesn't accelerate with the revs. Similar if you was to dip the clutch when accelerating.

overboostUK

Sounds a little bit like what mine is currently doing... I was wondering if mine was the maf. Have you done any tests? Got any results?

b3nmw

not done any tests as yet as car is sorn and is off the road, only run now and again to keep things moving, damn recession. scooby to be bk on the road next year, il look at the boost solenoid on weekend if ive got time.

Matt2732

iTrader: (1)

That won't take long to pop it off a give a clean, definitely worth a go.

rob84

iTrader: (5)

Got one in the workshop today doing the same, Gearbox neutral switch faulty turning the avcs cams off & an open circuit in camshaft position sensor A circuit..

subaru jon

hi just joined today.im having a similar problem ive had mine mapped by andrew at teamcarr its mafless with full 3" de cat exhaust system.my 2002 wrx engine light comes on between 5,000 rpm and 6,000 rpm and its like loosing boost but after 6,000 rpm the light goes off and starts boosting as it should.would this be down to the nps switch.

rob84

iTrader: (5)

Usually only affects the 6 speed box with the engine having avcs. your issue sounds more related to Knock activity going way off the scale to be honest.

subaru jon

it ran perfect after it was remapped about 2 weeks ago.it first happened 3 days ago when i was going onto the motorway.do you know what i could try to solve it please.

rob84

iTrader: (5)

without looking at any recorded data it's difficult to say were to start.
different batch of fuel perhaps ?
Fault with the knock sensor ?
Missfire ?

There all possibles to be honest..

subaru jon

ok thanks.i was running it on v-power and for a few days i ran it on mometum from tesco.i put my scanner on but there's no codes.could it be down to the knock sensor needs to be changed.

rob84

iTrader: (5)

If there were no Cel Codes In the vehicle it could well suggest a Knock sensor issue going beyond it's preset parameters, seen it happen before.

Have you tried a fresh tank of fuel and an ecu reset ?

subaru jon

no not yet.to reset the ecu do you have to discconect the battery?

rob84

iTrader: (5)

new age doesn't seem to reset in that manner, you can certainly try by all means leave it disconnected for a couple of hours

subaru jon

how do you reset the new age ones?

rob84

iTrader: (5)

by means of a subaru diagnostic computer or similar diagnostic software, it gives you the ability to clear the memory back to what it was mapped too so it starts learning again

subaru jon

ok thanks for your advice i will give it a try

b3nmw

Sorted, it was the clutch and worn flywheel, cheers 3 arches cardiff