Overboosting Surging

[solly007]

Car was running fine on 12 psi 336 kw, has sat around for 12 months not started, now the car is slow to reach boost and hits 20 psi and starts surging like rev limiter, have fitted a new boost sensor under headlight checked the waste gate is not stuck. ford says no codes.oiled the waste gate solenoide, car is ba 03 auto 4 inch dump valve springs ect was running 336 kw all done by BTA motorsport any ideas guys. Im like 600 kms from any dyno tuner so if I can fix myself would be great.

[jonn]

not sure how the oil would look after a year of sitting, maybe check that out.

and maybe get some octane booster so u dont kill it as your testing. 8lb is a fair bit extra

all I can think to do is go over your turbo housing to solenoid to actuator hoses. if one of those were cracked or something it would lead to over boost

also 100% accelerator then try turn the car on for 10secs. it wont start because I knows youve got your foot on the accelerator, after 10 secs just take ya foot off and let it start. thatll reset the cam and throttle sensor. worth a try

[Tobey]

Check all of your piping for perishing. Also drain fuel and refil.