Gt4 Problem Turbo.

[antscelicagt]

Hi all..

problem...

I have a st185 gt4. the gauge on the dash above the fuel gauge shows no boost at all ever. also, i have no boost from the turbo. i have checked as many hoses for leakage and splits and non connections as possible, but there seems to be nothing wrong.

i have yet to check the vsv to see if it's working.

i think i may change the turbo as someone said it might just not be working.

how does a turbo come 'on' boost?

EDIT:

ok.. so i've had a look under the bonnet.. and all i can find is a cracked inlet pipe(air)from the AFM to the turbo..the spindle in the turbo spins with no pressure and dosen't wobble or pull out or have any play in it whatsoever.. so i guess that puts the snapped spindle thing to rest, and i think the vsv isn't working.

am i correct in thinking it's attached to the bulkhead on the far left with an electrical connection and 2 pipes coming from it.??

when i put the key in the ignition and turn it to 'on' the needle for the boost gauge will rise to just below 0. when i start the car the needle drops back to it's 'off' state.

any ideas guys?

tony.

[adamgt]

im noy good at this technical turbo stuff but could it be that your guage is broken?

does the car feel slow

[antscelicagt]

the car feels very slow. there is no boost from the engine at all.

the gauge on the dash is working fine.

i can't think of anything that it could be.

the turbo spins, i think.. but produces no boost, any way i can check?? when i took off the intake hose the engine stopped. so i couldn't see if the impellor was working or not .

tony.

[chris202]

Mate , time for the proffesionals i think ------- might be costly but i reckon get it to a good quality garage

[antscelicagt]

hmmm.. thats what i was hoping not to do.

anyone else??

tony.

[daktari]

Try sealing the inlet pipe. Your losing all the air from the airbox. Liken it to a vacuum cleaner hose. If you put your hand on the end when its working ok it`ll suck hard. Put a hole in the pipe, it`ll lose suction.

[Bibbs]

the car WILL stall when you take the pipe off as the AFM detects no air going into the system.

Check you actuator and the hoses connected to it.

[antscelicagt]

how do u check the actutator is working??

tony.

[GTForbes]

the only way i can think off is to use a compressor, the actuator arm should begin to move at 5p.s.i. but you'll need to make sure that the pipe to the VSV is dissconnected and sealed before trying this.

[Bibbs]

Yup, get a compressor onto the turbo side ..

[mikeb]

I think we've already got to the bottom of his problem.

This is what happens when someone starts three threads on the same subject.

[antscelicagt]

sorry.

tony.