Bit of a weird one for you guys to scratch your heads about.

I've just put a 1996 uk phase 1.5 engine into a 1994 WRX. I've swapped the manafold to a phase1. Now the fun begins. It runs like a dream... boosts perfect until she's been on a run (Half hour or so) She'll boost but the timings being pulled back and she pops and bangs like a bitch (Big *** fire ***** out the back)!!! I've changed the plugs and coil packs god knows how many times. New maf, and new boost hoses. Actuators pretty new aswel. I was running an avc-r but i've disconected that and it's still doing it. When she's doing this funny stuff i can drive the car perfectly off boost.

This makes no bloody Sence to me at all

 

using the phase 1 turbo or phase 1.5?

sounds like intercooler or vacuum pipe leak

Simon

 

tdo5 turbo. All pipes are spot on. Checked them over and over again. Surely if it was a leak it would do it all the time???

Cheers
Craig

 

no as heat will alter how rubbery the pipe is.

do you have a vta dump valve? could be sticking open when hot

 

I've been thinking the dump valve to be honest... Never had any problems with it before tho. I suppose i'll have to buy another one and see what happens

Thanks for your time simon

Craig

 

refit the original?

also if on the original phase 1 tmic the plastic pipes sometimes crack

 

havn't got ther original one mate, dont think i ever did for this one. I've checked all the intercooler pipes and their A ok... I'll try another dump valve and if that doesn't work she's going down the scrappie lol

 

lol

 

nope aint the dump valve boys!!! What the hell is it???????????????????