Fuel system diagnostic help.

[Bill Rowe]

i had to read your orig post again to make sure you're getting the correct
advice.  so far you've replaced the plug wires, cap, rotor, and plugs and
car still runs bad, correct?   can you describe the hose you replaced?  now
i would look at:

1.  intercooler to throttle hose (aka "michelin man") for hole/tear/oil on
the underside
2.  ox sensor
3.  wide open throttle (wot) switch

#1 is easy to test while 2 and 3 are tough.  however if neither have ever
been replaced it's probably not a bad idea to replace 'em anyway.  you can
get a generic bosch ox sensor for $39 that requires some splicing and a wot
switch will run under $50.  both are fairly easy to r&r.  you can try
unplugging the ox sensor and see if it runs better.  car will run rich and
burn lots of gas in the interim but it will have power and won't
stall/hesitate.

-----Original Message-----
From: M. Oesterwinter [mailto:marcuso at u.washington.edu]
Sent: Saturday, December 23, 2000 10:42 AM
To: Bill Rowe
Cc: Kneale Brownson; quattro at audifans.com
Subject: RE: Fuel system diagnostic help.


Cap was old, but nothing really odd.  Rotor was replaced pretty
recently.  Plugs seemed fine to me, but I wouldn't know the
difference.  Oddly enough, after test driving for the first time, the car
still had problems.  Then I drove the car again to test the O2 sensor
under load, and it seemed to do fine.  I am thinking that mabey if I am
really lucky, it was just a loose connection to the O2 sensor....

Now I have two new fun problems.  1. Battery or alternator - I suppose the
battery (if I almost stall it, the lights quickly dim).  2. Headlights
switch is stuck in the on position.  I can get the lights off, but it
doesn't click into place.  Ugh!

On Sat, 23 Dec 2000, Bill Rowe wrote:

> when the pump gets real bad you can hear it "buzzing" as the wife pulls
into
> the driveway :)  but somehow i don't think that's your problem.  what was
> condition of cap, rotor, and plug when you removed 'em?
>
>
>
> ---Original Message-----
> From: Kneale Brownson [mailto:knotnook at traverse.com]
> Sent: Friday, December 22, 2000 10:26 PM
> To: M. Oesterwinter; Bill Rowe
> Cc: quattro at audifans.com
> Subject: RE: Fuel system diagnostic help.
>
>
> You might hear it if you put your head in the trunk and there's not much
> other noise around.  The pump runs only when the engine is turning
> over/operating.  Just turning on the key without engaging the starter
won't
> let you hear the pump.
>
>
> At 06:50 PM 12/22/2000 -0800, M. Oesterwinter wrote:
>
> >I replaced the cap and rotor.  I was just at the store to buy a spark
plug
> >socket.  I will hopefully replace the plugs tonight.  I can't hear the
> >fuel pump.  It is located in the gas tank, right?
> >
> >- Marcus
>
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