Hi i have had a problem for 2 week's were my boost was going up and down and holding back,i have now been to forestor's subaru and had it checked and he replaced my boost solenoid for me,went up and down the road for a test and it was boosting load's better and seamed fixed,but now it is fine when i put my foot to the floor but pulsating up and down when not fully to the floor on throttle is this normal?? and allso it is makeing a ticking noise when u put your foot on the throttle is this normal as the other one didn't???PLEASE CAN ANY ONE HELP CHEER'S ANDY

 

What mods exactly do you have on your car??

 

NONE M8 COMPLETELY STANDARD

 

what version is it, 2 or 3??

 

I was told it is a version 4 m8

 

Standard ECU?? No manual boost controllers or any other engine mods whatsoever??

 

NO M8 AS FAR AS I NOW

 

Have you check for error codes and reset the ECU??

 

I HAD THE ECU CHECKED FOR ERROR CODE'S AT THE SUBARU GARAGE AND IT WAS FINE BUT DIDN'T RESET IT M8

 

have you tried cleaning the soleniod out with brake cleaner, disconnect all the pipes off it then plug in the 2 green plugs under the dash turn on the ignition but dont start it then stray the brake cleaner in side the soleniod plus take off your boost pipes an clean them out 2 see if that sorts it

 

Manually reset the ECU and see if there are any error codes coming up via the engine check light whilst you are attempting reset.

If there are no your errors showing the probelm could be with one of the vacuum pipes coming to and from the turbo and boost control solenoid. If any of those pipes are cracked and leaking you could get boost oscillation.

Failing MAP sensor might cause boost oscillation as well.

Failing boost control solenoid covered now as you've had that replaced.

Wastegate actuator might have a problem, difficult to say without being there to try and diagnose. The ECU on part throttle is obviously struggling to keep steady boost.

An intercooler leak or possibly aftermarket BOV with a weak spring could cause boost oscillation too.

Getting the car onto some rollers to identify and isolate the problem may well be prudent at this stage.