55psi with no vacuum to the regulator, 46psi with engine idling and manifold
vacuum to the regulator.



"arachnid" > wrote in message
newsan.2006.08.03.19.42.27.930208@goawayspammer. com...
> I'm trying to help someone with an old 1991 Fifth Avenue (3.3L) that's
> been sitting in their driveway unfixed for a year. Symptom is that it
> idles OK, engine revs smoothly to high RPM's in park, accelerates to 55
> mph on flat roads if you're real gentle but stalls instantly if you try
> to push it at all. The engine doesn't quite die unless you keep pushing it
> but it takes quite some time to recover. It can't maintain 55 on even the
> slightest hill.
>
> The fuel pump sounded awfully loud for a luxury car so I started by
> replacing the fuel filter to make sure it isn't clogged. It made no
> difference in the problem or the noise so I gave in and bought a
> fuel-pressure gauge. Don't have my tach with me but just guessing at the
> RPMS, I'm getting a fuel pressure of 30 PSI at around 1,000 RPM and 22 PSI
> at around 2500 RPM. Sounds like the fuel pump to me but I'll wait for the
> specs to be sure. (Just to save me a little looking, is the fuel pump on
> this car in the tank or external?)
>
> I'm also getting a TPS code which is the next suspect in line if the fuel
> pump is OK. Can this code be caused by a bad fuel pump, or is it a pretty
> solid indicator that I also need to pick up a TPS when I run into town for
> parts?
>
> The engine codes a
>
> 12 Battery recently disconnected
>
> 41 Alternator field control circuit open or shorted.
>
> 24 Throttle Position Sensor
>
> 35 Cooling fan relay circuit open or shorted.
>
> The battery was DOA from sitting for a year and I had to jump-start the
> car, which may explain the alternator code. I'm holding off on the
> cooling-fan problem until the car is more drivable.
>
>
>