When i accelerate from first gear, my blow off valve activates at 5 and half thousand rpm and sometimes causes the engine to stall temporarily. This sometimes continues in the rest of the gears and then suddenly the problem dissapears. Have just fitted a blow off valve-could this be the problem with my 93 wrx?

 

sounds like the blow off valve is not holding boost pressure have u got a boost guage you would be able to see whats happening.

 

Ive no boost gauge,ive only got dump valve put in.It was running fine before dump valve but alot slower,now its very quick but cuts out at 5000 rpm and again at 55000 rpm.Ive read other forums and its says its overboost!!! is this true and how can i fix it???

 

Do you get the same problem if you accelerate hard in 2nd,3rd, 4th, 5th?

 

if your Paul...............then i would guess that your electronic boost controller is allowing "over-boost" as discussed, doubt its anything to do with the d/valve.......

alyn