First problem...didnt take long

[bull996]

So what could this be then...under hard acceleration there is slight hesitation. Its like missing a beat but not severe-more a slight stutter. It only happens on full boost circa 5000+ rpm.

Any ideas please?

[MrFlibbles]

Has the dash flagged up any ECU faults?

Back in the day when I had my MY02 WRX it had a (very slight) misfire under heavy load (i.e. all the time with me )

It turned out to be a sensor of some kind, can't remember what, but they did say it was a common fault - cost about £120 from the dealer IIRC)

[bull996]

Nothing on the dash at all... No warnings. It was OK on Friday but just did it tonight-

[MrFlibbles]

Doesnt sound like boost cut, so, er, no idea sorry.

Someone with a few more brain cells will be along shortly.

[bull996]

Thanks for help anyway!

[_Al_]

Cracked coil packs are a common problem and would give those symptoms. Not sure what they cost to replace. Have you had it serviced recently? Old spark plugs would give the same effect.

[bull996]

Not had it serviced since I got it last week, but think I will take it in on Sat!

[torres del paine]

What car have you got? It could be that the timing is out or a lazy fuel pump.

When I had my car tuned it dipped slightly under full boost at around 5krpm because of the fuel pump. I bought a better flowing fuel pump and it sorted it out.

[bull996]

I have a 2001 WRX. Totally standard.
Thanks for the help so far!

[Mr E]

My initial suspicion would be ignition - either plugs or leads?

[trickywoo]

Could also be detonating. Thats what mine did before it let go.

[Vixpy1]

Air flow meter

[ScoobieWRX]

i agree with Charlie, MAF sensor for sure. I changed mine recently as it was giving low flow readings and kicking up a cel error too. Also it was running like a bag of shit so now i've changed it it's lovely again

Get a used one from a scooby breaker online like grade-a subaru. They test all their bits before they're mailed out and it's better than paying full wack brand new from a scoobie dealer.

[Orangecurry]

before you do anything else, try running the petrol down, then filling up with IMO Tesco RON99 or similar, then do an ECU reset.

Does it still hesitate?

Edited by Orangecurry on Thursday 27th September 10:34

[cw42]

Bull996, where are you in the Northwest? Give Adam at Autotechica in Buxton a call, he'll sort you out

07855 364898

[PGM]

Hi Bull it's PiG here.

This is a common scooby problem - spray brake cleaner into the boost solenoid and vacuum pipes alongside. Then go for a good blast. Job done. Also re-set ECU.

Any problems with this, give me a shout and I can help you but a quick search on scoobynet or the like will pop up decent instructions.

[Orangecurry]

PGM said:

Hi Bull it's PiG here.

This is a common scooby problem - spray brake cleaner into the boost solenoid and vacuum pipes alongside. Then go for a good blast. Job done. Also re-set ECU.

That was going to be my next suggestion

I found it HUGELY useful to take a photo of the pipe set-up around the solenoid before taking them all apart and running brake fluid through them. Then I could get the pipes back again in the correct places.

Make sure the engine oil-level is not too high, as this is what causes the problem in the first place allegedly.

If you've just bought the car, get an oil-change done ASAP anyway, for peace of mind at least.

[PGM]

Orangecurry said:

PGM said:

Hi Bull it's PiG here.

This is a common scooby problem - spray brake cleaner into the boost solenoid and vacuum pipes alongside. Then go for a good blast. Job done. Also re-set ECU.

That was going to be my next suggestion

I found it HUGELY useful to take a photo of the pipe set-up around the solenoid before taking them all apart and running brake fluid through them. Then I could get the pipes back again in the correct places.

Make sure the engine oil-level is not too high, as this is what causes the problem in the first place allegedly.

If you've just bought the car, get an oil-change done ASAP anyway, for peace of mind at least.

good advice

edited to say that one of the pipes going to the wastegate has a little brass restrictor in it, worth checking it is clear too. I have some spares of these in my garage you can have if needed too.

Edited by PGM on Thursday 27th September 11:52

[Orangecurry]

PGM said:

one of the pipes going to the wastegate has a little brass restrictor in it, worth checking it is clear too. I have some spares of these in my garage you can have if needed too.

If that is also fitted on the MY00, which pipe is that one please?

[PGM]

Orangecurry said:

PGM said:

one of the pipes going to the wastegate has a little brass restrictor in it, worth checking it is clear too. I have some spares of these in my garage you can have if needed too.

If that is also fitted on the MY00, which pipe is that one please?

yes it is I have a MY99.

From memory it is one of the thin vacuum pipes that is about 3 inches long to the right of the solenoid where 3 pipes join. You can feel the restrictor inside the pipe if you squeeze it then you will find it easily enough