Re: Fuel supply issues (problems ?)

[Aleksander Mierzwa <alex@matrix.pl>]

At 13:44 99-01-08 -0500, Pcarselle wrote:

>Audinats and contributors... need advice:
>Have an 1987 5000 CSTQ with 162K. miles. In very good shape.
>Recently , the normal (but fairly loud) buzzing noise from the fuel pump
>has intermittently increased in level to about double the intensity with
>the following consequences:
>When the buzzing gets louder ( every 20 minites or so )
>1.- The car misses when subject to acceleration. (all gears)
[...]
>Pulled "output" codes with following results ( I can't understand )
>1st code - 4433 ???
Fuel pump should run at this point

>2nd code - 4441 ???
Frequency valve should buzz

>3rd code - 4442 ???
Wastegate valve should click

>Suspect:
>Fuel pump strainer clogged
>Check Valve
>Pressure accumulator
>Control pressure regulator.

You have a slight chance that the clogged fuel pump screen is the culprit,
but the most likely explanation is just that the fuel pump dies and needs
to be replaced. They are not very reliable and you have a textbook symptoms
of a dying fuel pump, I'm afraid.

Aleksander Mierzwa
Warsaw, Poland
mailto:alex@matrix.pl
87 Audi 5000CS turbo (mine)
88 Renault Medallion wagon (mom's)
91 mountain bike (just in case both cars broke at the same time :-)