I'm new to turbs and my my99 uk2000 fluxtulates up and down on boost , it did the same thing b4 I put on my full Decat exshaust and it's got a k&n cone and ive put on a sti tmic , it's got standard ecu , I've checked pipe work turbo has no play , it feels like loosing fule but not missfireing just hold bk , I've got a Walbro to fit , but because I don't know turbs its like the unknown HELP

 

Sound like the boost solenoid to me.. I had the same issue with mine and found a pipe split on the solenoid.

 

I've checked the pipes but you think it could be valve ?

 

The boost solenoids can give trouble usually after freezing weather or car been left up for lengthy periods in my experiences.
It doesnt sound like its starving itself of fuel, you will only know that when going for higher rpm and high load. I have a version 6 standard ecu that i can post to ya and see if that remedies the problem.

 

Car need to be mapped ,problem is with the boost solenoids duty cycle now needs to be changed with the decat exhaust

 

Ok that's gd ty , I've really only just had car couple of months and it did it from the start only on harder than normal driving not trashing it do u see problem so even at standard set up had same issue , it's got no worse with the mods , I'd try ecu to see if u think it may work ty neil

 

Even when it was standard it had same issue , I'm going to try. Cleaning valve

 

Have you cleaned the boost solenoid out? Just pop the pipes off it and undo the 2 nuts to get it free - connect the plugs under the dash to get it cycling (do a search on here if you don't know how to). Then while it's cycling blast it out with WD40 or similar. Let it dry out - refit and try the car then. My MY99 used to do the same. Avoid high revs in first gear on the MY99 - oil gets to the boost solenoid and clags it up, my old one had the same mods as yours. Ran fine with no remap (checked over by Prosport on their rolling road) - for years and still is to this day - 10 years 100k odd miles last time I saw it

 

Green plugs were under dash ?

 

Think it is, few years since I had a classic. Do a search for boost solenoid - it should come up.

 

Ok ty

 

Is it just green plugs and not black ones and do I start car ?

 

I've joined green wires and cleaned valve is working as far as opening and shutting , took car for a run but still on full boost 15psi it wavers up and down to 10psi but dose feel a little better

 

Your actuator could be leaking try blowing down the pipe thats onto it.

 

Right I've taken the valve out the circuit and linked pipe car boosts to 8psi and problem has gone , but on first driving car had massive flat spot on first big boost then was fine boosting to 8psi , I've put it bk together but wifes now out in car so will test later lol