[V8] TPS? - Injector Seals (Final)

[S_Matus]

I started this thread and have good news to report.

I actually performed this seal replacement operation 3 times this past week.  I would consider myself an expert now!

The first seals were a poor quality rubber and replaced them with the NAPA sourced part.  NAPA part number MPF312085 (3-21085) for $2.89 will include 8 seals and a cone to install the seal over the injector tip.  I did not use the cone piece, for it was easy to strech over the injector tip (a little WD40 helped). Buy 2 kits for 1)injector tip and 2)fuel rail.

The car has come back to life.  It seemed that the car was sluggish and lacking power.  After the seal replacement I have a steady idle and the power delivery is much smoother across the rpm band. So I'm sure that the injector to intake manifold interface had a vacuum leak.  The Mouse Nest on top of the air filter may have contributed to some loss of power.

This repair should take no more than say 1 hour give or take a few minutes.

TPS Issue was a leaking fuel hose, but could have been the bad first seals.

Scott.
'91  V8 5-speed
'90  V8
'03  RS6



------------ Original -------------



Message: 6
Date: Mon, 5 Mar 2007 07:20:30 -0800 (PST)
From: S_Matus <scott_matus at yahoo.com>
Subject: [V8] TPS?  - Injector Seals
To: V8 <v8 at audifans.com>
Message-ID: <873465.27471.qm at web33101.mail.mud.yahoo.com>
Content-Type: text/plain; charset=iso-8859-1

-- TPS?

I have a deadspot in my throttle just above 2000 rpm.  It will 
fluctuate the rpms while continuing to depress the pedal.  Then it will resume 
to normal rpm / throttle position ratio at about 2300.  When the car is 
in this "dead" position it will buck violently.  If I press pedal 
quickly I can "overshoot" this dead spot.  It make for interesting driving 
experience.

Is this a Throttle Position Sensor?  Where is it located and is it a 
costly part?

Please advice that to do?

-- Injector Seals

I replaced the Injector Seals (all 16).  I was amazed at the loose 
fitting injectors in the intake.  There was a large amount of goo in and 
around the injector opening in the manifold.  This drastically improved 
the Idle and the perfromance from the engine.  I wish i had done this 
years ago.  The seals were no longer elastic, and I'm sure it was a 
vacuum leak.  Guys spend the $16 and replace these seals.

Thanks,
Scott
'91 V8Q 5-speed

 
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