Hi. after years of wanting i have finally bought a Scooby
its a 1995 impreza wrx auto japanese import.
my problem
at high revs the throttle cuts out for half a second and then clears, it only happens at high revs and is not an issue during normal driving. i bought the car with this problem and want to know what you guys think as i dont want to throw money away on wrong parts etc.
it has been suggested its a power valve problem, however i'm not very technically minded and would appreciate some advice from people who know
their subarus
any suggestions appreciated.

 

Sounds like its over-boosting. Does it do it in every gear and do you have a boost gauge fitted?

 

it seems to be when you put your foot down hard and rev specific so you maybe right. i dont have boost gauge. its very frustrating as i've wanted a scooby for ages and it cant be driven like its supposed to

 

As mentioned it sounds like its hit fuel cut due to overboost.

 

What mods you got fitted? Does it have an aftermarket ecu?

 

i have to be honest with you fellas i dont know if its standard or aftermarket, like i said not very technically minded. if it is overboosting how do i rectify?

 

use shell v power or tesco 99 only and get it looked at by a subaru specialist

 

a Subaru specialist would be the obvious option but unfortunately buying the scooby cleaned me out, so i'm hoping to try and repair myself if possible.

 

Where in Hants are you?

 

It ciould also be the spark plugs, if they are worn or to hot a grade they can and will cause missing at higher boost levels.

I would recommend NGK PFR7B's , and it is a job you can do yourself with some basic tools (from the top, more work), or at a hobby/DIY garage (or on ramps)
The former will take more time, the latter would need ramps, or a lift, but takes much less time.

 

Right, to start with you need to find out what modifications your car has, ie decat exhaust (easy enough to tell, it wont have a cat in the downpipe), is the backbox and centre section a stainless jobbie?
What fuel are you running?
Is there a boost gauge fitted?
Replace the plugs like Dutch said, you dont need the 7's, 6's will suffice (remembering its an auto so less power than the manuals).
You also need to inform your insurance co of any modifications you find, ignorance does you no favours if you have an accident.
Saloon or wagon also??

Tony

 

If it is over boosting and have fuel cut you WILL know about it. It feels someone has slammed the brakes on for a second and you are about to headbutt the windscreen. If it isn't doing that and just misfiring at hi revs plugs and or coil pack might be the problem.

Plug are a rather fiddley to change but can be done DIY. Have a look here
http://www.scoobymods.com/showthread...ons-3017.html?


If you are getting fuel cut you can try cleaning the boost solenoid

http://www.scoobypedia.co.uk/index.p...ontrolSolenoid