rx jamie

another problem with my 1994 wrx. the boost is holding back and stumbles a bit. feels like it boosts high then fluctuates rapidly high low high. power doesnt feel like its all there. ive tightened the bov spring to no avail. any ideas. someone suggested spark plugs or actuator ?

rx jamie

anyone ? someone must have had a similar problem ?

ive changed the bov for a bailey one. still the same problem only less severe.

assam

Hi mate I have the same problem, Ive been told a number of reasons that could cause this.
1. the air flow meter
2. Boost setting need adjusting
3. The dump valve as you mentioned
and finally someone had the same problem and found that the llambda sensor had gone (havent got a clue what that sensor is) and his spark plug was slowly melting.

Got this info from scoobycity.co.uk.

Its supposedly a common problem on the classic and only happens when you put your foot and you get a violent jerk for about a second. If you find a solution let us know. Personally im gonna have to pop up ot scooby clinic to have it checked out.

p.s do you know of anywhere I can take my scoob in or around London??

Cheers

ben1413

iTrader: (5)

I've got a 1994 WRX and had similar problems to what you have described. It turned out to be the fuel pump in the end. However, for these sorts of problems, they are never cut and dry. You need to go through a process of elimination.

Make sure that the spark plugs are relatively new and are gapped to about 0.7mm. When you check the spark plugs, also check the coil packs. Remove the rubber grommet from around the coil pack and look for any small cracks on the face of the plastic.

It might be worth connecting the green plugs together under the dash and see if the ecu comes up with any faults. If not then check all the turbo hoses as they are prone to splitting, cracking and the car is almost 12 years old. If you have a boost gauge then have a look at what the car is boosting at. If it's standard then it should be around 0.8/0.9 bar I think. If you have a manual/electronic boost controller and the boost is more than standard then try turning it down.

Your best bet would be to take it to a specialist and see if they can diagnose the problem. I'm only giving you the advice that I was given.

Good luck with it though, it was frustrating for me but you always get there in the end!

Ben

rx jamie

thanks for the help. its working fine now. its an intermitant problem. but im booking it in at a specialist soon just incase. wheres best ?