[s-cars] Need Help Diagnosing a Stutter

[Igor Kessel]

Douglas Fifield wrote:
> S-hedz,
> 
> I have an intermittant stumble/stutter that is proving elusive to pin
> down.  Most often, it acts and feels like a cylinder has dropped out.
> Very similar to last summer's POS channel failure except that it does
> not stick around long enough to raise the hood and try to isolate a
> cylinder.  Usually only appears with a warm engine.  Seems to clear
> itself in short order.  Sometimes I downshift to change RPM's.
> Sometimes a quick couple of pedal presses does it.
> 
> I have a spare POS, new in box in case it is that, but I am not yet
> convinced.  Just put in new plugs and plug connectors to see if that
> would fix it.  No go.  It also doesn't appear to be related to high
> boost conditions, so I am not thinking a coil.  Could a failing fuel
> pump exhibit these conditions?  How would you best test the health of
> the fuel pump.
> 
> Inquiring minds want to know.
> 

CPS

-- 
Igor Kessel
two turbo quattros