[V8] no idle at start

[Scott Phillips]

Scott, 

In  addition to the crankshaft pos sensors, there are also RPM sensors
that will give you the bouncing Tach issues, but will also cause the car
to act as described. The repair manual describes them as Ignition
Reference Sender and Engine Speed Sender. They are both located on the
driver's side rear of the cylinder head. 

The good thing here, is that they should produce some codes that you can
blink out. And That's where I'd start the diagnosis. Before you start
opening things up, if this "just" started happening, think about the
things you changed (like the picture of the gunky hose)  those senders
are back there. 

Blink out the codes and let us know where that takes you.

Scott  '90 V8Q



-----Original Message-----
From: v8-bounces at audifans.com [mailto:v8-bounces at audifans.com] On Behalf
Of Scott Simmons
Sent: Friday, November 17, 2006 8:09 PM
To: v8 at audifans.com
Subject: [V8] no idle at start

Last email of the day, I promise:

I'm fighting two hard-start issues.  The first is a no-start due to 
faulty/aged crankshaft position sensors.  That I know about.

The second will manifest itself here and there but today it did it for 
at least 5 minutes.  The car will crank, the tach will bounce, the 
engine will fire, it'll rev up to 1000 or so, come down to its idle 
spot.... and keep going down and die right away.  Trying to restart the 
car will produce the same result.  If I hold the gas pedal down while 
the engine fires, I can hold the car at any rpm for as long as I want.  
I can sit there and rev rev reeeeeev but if I let go of the gas it just 
keeps falling and dies.  Three minutes later, car acts fine.

Is this a sign of a faulty idle stabilizer?  I'll probably clean 
whatever's the problem first, as it seems to only occur when there are 
lots of people around to watch me sit there and have trouble with the 
car (the sensors do this too, of course).  It's not common enough to be 
a real problem but I'd like to fix it before it does.

~Scott Simmons
_______________________________________________
Audifans V8 mailing list
Send posts to: mailto:V8 at audifans.com
Manage your list connection: http://www.audifans.com/mailman/listinfo/v8
Have an Audi V8 question?  Check the Audifans Knowledgebase!
http://www.audifans.com/twiki/bin/view/Audi/V8
Have a V8 answer? ... Please help others by adding to the KB ... all
contributions welcome!