If it does in fact have a faulty wastegate actuator, the overboost
switch *should* kick in, if this happened, you'd know it. It cut's
fuel so it would be a solid jolt.. If the overboost switch isn't
working correctly you would hear a ton of detonating.. either of the
options suggested above are worse case.
there's a little yellow LED on the bottom of the instrument cluster,
did you notice if that came on when you had the key in the 'ON'
position, or while you were driving at all?
If that light comes while you're driving the car, it means it's thrown
a code, and could possibly be retarding ignition timing waay back
which would cause a HUGE loss in power.
I'd suggest making sure the detonation / engine code light is in fact
functioning, and if you could, hook up a boost gauge to see whats
going on while driving. have you checked ignition timing already?
if there is in fact a problem with the wastegate, and its been
overboosting for god know's how long, i'd pass on the car.
let us know how it goes!
/august
PS, http://www.505turbo.com has some good info
On 9/15/05, Charles Lincoln <charlie.lincoln@gmail.com> wrote:
>
> Looking at a 1987 505 Turbo, with ZF4HP22 Auto trans, to purchase. I
> don't know anything about turbos, yet (my current '87 has the XN6 engine).
>
> The turbo seems to kick in and then immediately cut out. e.g. At 40 mph,
> depress accelerator: transmission kicks down and car starts to accelerate,
> one hears a hiss which I gather is the turbo kicking in, and then it sort of
> falters and just maintains the current speed at the higher rpm with the
> accelerator still fully depressed.
>
> The dash turbo gauge does not work.
>
> From reading about others turbo issues on the list, I will start by
> speculating might this be the overboost safety valve? If so, is that just
> an adjustment issue?
>
> What are some other possibilities and what's the worse case?
>
> Any ballpark on what repair might cost (parts anyway); so I can decide
> whether to get this car and how much to offer.
>
> Charlie Lincoln
> 503-636-0012
> 877-495-8467
>
>
>
>
>
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Received on Fri Sep 16 10:24:41 2005
