[urq] urq Hot Start Issues

[Paul Ahvenainen]

I have gotten a lot of great information on the CIS hot start issue from this group.  Thank you so much, I've had this car about 8 months now, and have learned a lot, but I still have a long way to go...

One thing I found a bit surprising is that push starting the car would work when the hot start issue is happening.  I took the car to the track last weekend and had a blast.  I had four 20 minute runs.  The car got surprisingly hot in 20 minutes, although the idiot light for temperature did not light up.   After each run I would let the car idle with the hood open for a couple of minutes.  Even after about an hour the car would not start.  I was getting concerned that I would miss my next run when someone suggested push starting the car.  I didn't think it would work, but what the heck.  To my surprise it fired right up and ran just fine.  After the second run, I had a 2+ hour break and the car fired up just fine using the starter.  Later with a short break, we had to push start again...

Thanks:  PA
-----Original Message-----
From: urq-bounces at audifans.com [mailto:urq-bounces at audifans.com] On Behalf Of laraa at sympatico.ca
Sent: Wednesday, February 19, 2014 7:45 AM
To: 'Mike Sylvester'; 'Ken LiPani'; urq at audifans.com
Subject: Re: [urq] urq Hot Start Issues

Addendum to your post Mike : when warm, the cold start valve do fire a bit,
via the hot start pulse relay in the ceiling of the passenger glovebox. If
you hear carefully, you can hear it cycling when cranking the engine.
Especially if there is a no start condition... 

Louis-Alain

-----Message d'origine-----
De : urq-bounces at audifans.com [mailto:urq-bounces at audifans.com] De la part
de Mike Sylvester
Envoyé : 19 février 2014 10:14
À : Ken LiPani; urq at audifans.com
Objet : Re: [urq] urq Hot Start Issues

Typically hot start issues with CIS are vacuum related. 
When cold, the cold start injector will fire, when warm it will not, so if
you have a vacuum leak there is not enough vacuum to lift the throttle
plate.  If the throttle plate doesn't lift the engine gets no fuel.
You can demonstrate this on a normal running car by removing the oil fill
cap and try to start the car.  You get the same crank but no fire.

A way to prove this is the problem,if you have 2 people and a 3mm allen
wrench, insert it in the CO adjustment and when the engine is cranking angle
the wrench and lift up.  This will manually lift the throttle plate and the
engine will fire.

Mike



_______________________________________________
Audifans urq mailing list
Manage your list connection: http://www.audifans.com/mailman/listinfo/urq
http://www.audifans.com/kb/List_information

Pictures/Polls/Database at: http://autos.groups.yahoo.com/group/urquattro/