Still need some help,

**ncarnall** · Tuesday 18th October 2011, 13:24

Hi all,
Right I've had the crank sensor replaced, vac lines replaced, temp sensor and thermostat all replaced. MAF and plugs cleaned. Running much better but still seems to hold back between gear changes when gunning it. I mean it boost up to 5k rpm change gear foot down, hesitate (more than just lag) then boost fine till next gear change. Any ideas? Actuator? how do I check and adjust this?

Cheers in advance
Neil

**M-R-P** · Tuesday 18th October 2011, 13:49

If it's a T-5 actuator, You should be able to just about pull it with both hands. If it moves easily with one hand then it needs tightening/replacing. You can connect a bike pump to it using an inflatable toy adaptor on the actuator hose. If the actuator backs away from the rod rather than the rod moving out of the actuator, then the w/g spigot is stuck. that can be cured with a load of plusgas and a small hammer.
Have you changed/checked the boost control solenoid?

**ncarnall** · Wednesday 19th October 2011, 13:25

Thanks for the info will go and check it shortly, but where and what is the boost control solenoid?

As you can tell, I don't know much about turbo's lol

**PHIL V70R** · Wednesday 19th October 2011, 14:27

lives on the side of the air box mate...small black with 3 pipes comeing off it hope this helps..

**ncarnall** · Wednesday 19th October 2011, 15:09

cheers phil, is there a way of testing it?

**PHIL V70R** · Wednesday 19th October 2011, 15:36

not that i no mate had 2 replace mine used one of my mates t5 then got a new one from volvo thinkit was about £54..have u had the codes read mate..should be po243..

**ncarnall** · Wednesday 19th October 2011, 15:47

Car doesn't have any codes stored or warning light on it's just not running properly as described above.

**PHIL V70R** · Wednesday 19th October 2011, 17:50

BCS would show up as a code..then only thing i can poss think of would be the actuator..2 bolts and its off...

**Niles** · Wednesday 19th October 2011, 17:56

just me that thinks it sounds fuel related?

**PHIL V70R** · Wednesday 19th October 2011, 18:57

lol...now thats a point..

**ncarnall** · Wednesday 19th October 2011, 23:50

When you say fuel related, what are you suggesting could be the culprit?
Not had chance to check the actuator today so thats first job for tomorrow morning.

Cheers for all the input guys, it's much appreciated

**PHIL V70R** · Thursday 20th October 2011, 13:25

pump..relay..or both..fuel rail..

**tim15888** · Tuesday 22nd November 2011, 19:42

That's what mine did when my MAF went, one of the times. Been through a few when I had the k&n cone filter fitted. If you've cleaned the MAF sensor with brake cleaner or whatever, and it's made it a bit better then it's probably that. What year/model is the car etc? Is is an electronic throttle body version? If it was a fuel issue, lack of pressure or whatever, you would more than likely notice it more when the turbo started blowing cos' it wouldn't be able to keep up with the air going into the engine/revs etc, and would run lean, and if it's the same as mine then the knock sensor would back the throttle off...

**tim15888** · Sunday 27th November 2011, 19:49

The other thing that it could be is the wastegate on the turbo. Spring might be weak and it might not be sealing until there is pressure behind it through the Vac pipe to hold it shut propperly. I had the problem when I first fitted a dump valve, took the vac pipe of the factory wastegate and it wouldn't boost propperly, as though it was slighly relieving itself through the wastegate...