98 v70r barely any boost. Wastegate not sealing?

Aaturner45654 · 3 Mar

Ok my r is suddenly slow as and im getting like 4psi boost tops.

Boost hoses look fine cant hear any boost leaks

I have an ipd Tcv. Seems fine, it clicks when i put 12v across it. Hoses all fine

Disconnected wastegate hose to isolate tcv as problem. No change still f all boost.

Pumped wastegate actuaror with bike pump. Moves fine. Holds pressure.

Pulled heat sheild. Actuator rod looks fine and seems to be adjusted properly.

Turbo doesnt have excessive play.

Anything else i should try before i pull the turbo out? Only thing i can think of is there is something preventing the wategate from closing/sealing properly.

Thanks!

timbo · 3 Mar

Check the cbv diaphragm

Aaturner45654 · 3 Mar

timbo ok just went and checked it seems to be holding vacuum

Rramrod · 3 Mar

Remove the downpipe to check the wastegate and it’s seat

Aaturner45654 · 3 Mar

ramrod oh tru yeah thats a lot easier than pulling the whole thing out

rado · 3 Mar

Clutching at straws but have you checked the Christmas tree pipes and also taken offthe throttle cover and look at those pipes ?

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I lost boost few years ago and found a split in a hose , the one that is blue in the picture

Aaturner45654 · 18 Mar

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Ok update turbo is out. Wastgeate seat has a tiny crack in it and has deposits on like 1/3rd of it which would seem to suggest its not sealing all the way. Tbh i was hoping for something a bit more dramatic... is this enough to explain my almost complete lack of boost??