Turboculosis

[ditchhobo]

Hey i am having some trouble with my b4.. Today after over taking a truck on the highway, I have been having some weird turbo issues. When the first turbo boosts at around 4k the car starts jerking a bit back and forth as if loosing and gaining boost the boost gauge needle jumps between 11 and 15 psi. if i floor it the second turbo is boosting 15 psi! im sure it shouldnt be that high. has anyone had such issues, anyone know what might be going on. also have noticed when driving and i take my foot off acelerator and cruise along im getting a knocking sound and i can feel it in the footwell. i have had a look under the car and the boot coming from the gearbox on the left is torn could this have cracked possibly?

Thanks, any comments would be appreciated

[ditchhobo]

from reading other threads im thinking 15 psi is normal.. i dont ofter look at gauge when going that fast.. (its where the ashtray is).... anyway mabey the problem is something to do with the knocking coming from the c.v area..?

[Guest Black aRSe]

is it throwing up an cel codes??

[ditchhobo]

no i dont have the tool to check

[ditchhobo]

no abnormal dash lights are coming on.. though i know oil pressure one is not hooked up.. though oil level is sweet..

[Guest]

15psi sounds about right?

check in your engine bay for any vacume hoses that may have come off or a split.also check your airflow meter is leaking any were.

if you look at the left rear of your engine bay youl find you turbo.hava good look around at all hoses and check for leaks splits ect.this may be the 'jerking'

[ditchhobo]

where is my airflow meter heh

[Guest]

it attaches to your airbox.if your looking into your engine bay youl find it on the left side

[ditchhobo]

ok ive been for a another drive this jerking is only happening in 4th and 5th gear.. would that mean its not a turbo issue..? mabey something in the drivetrain slipping? mabey something to do with the knocking i have been hearing.

[ditchhobo]

it seems to happen the most when the second turbo begins to come in.. but only in 4th and 5th and once so far in 3rd. could it be the solanoid?

[telemekas]

A quick check of the ECV duty solenoid. This would be active as you descibed

"second turbo begins to come in.. but only in 4th and 5th and once so far in 3rd"

This solenoid can be isolated for a check. Disconnect the positive pressure line No: 5 from the top port of the very large ECV actuator on the drivers side engine bay.There will be a short step up hose.Plug the hose only.Test drive the car

[ditchhobo]

I have tried doing what you said but still does the same thing

Any idea what else it could be

[ditchhobo]

If the blow off valve was loose would that cause the problem

[rex-leggy]

 ditchhobo said:

If the blow off valve was loose would that cause the problem

could be.... def wouldn't help at all