Re: Low Turbo Boost '86 5KCSQ

[George Simmons <gsimmons@sjm.infi.net>]

Thanks for your response.  The output tests on the ECU cause the frequency valve
to click and I pulled the ECU codes but everything was normal.  How is the best
way to determine if the turbo is spinning?  Also do you have to remove the WG to
take the cap off as you suggested?  All connections between the turbo and the
manifold appear to be in good shape.

Thanks again,
George Simmons

Alex Kowalski (audial@aol.com) (Tonya Jones) wrote:

> Did you do the output tests on the ECU that cause the WG frequency
> valve to click?  Did you pull the ECU codes?
>
> It could be a stuck wastegate -- they're not that hard to take the cap off
> of and check.
>
> Are you sure the turbocharger is spinning?
>
> If the valve clicks and isn't leaking and the WG isn't stuck then it could be
> that your turbo is no longer spinning or you have a leak somewhere else -
> maybe the intercooler to throttle-body hose.
>
> Even without the backpressure from the WG frequency valve I thought
> the turbo should put out _some_ positive pressure with only the
> wastegate spring? Then again, maybe your dash gauge reads low but
> since you say you were seeing 1.4 bar this seems pretty unlikely.
>