Audi 100 Won't Start: Finally Starts !!!!!!!

[Kurt W. Deschler]

Marc,
Try pulling the #1 injector (easy to get at), put it in a glass jar, and
watch it while repeating your starting ritual. Sounds like you may have a
problem with the mechanical metering or low fuel pressure (takes 60psi or
so to open CIS injector). Try lifting the plunger in the CIS box and see
if that increases the fuel flow from the injectors. If you get nothing,
try unscrewing the injector and see if any fuel comes out then.

	Kurt
	87 5kcstq
	88 vw gti 16v

> Message: 5
> Date: Thu, 29 Jan 2004 16:56:12 -0500
> From: "Marc Boucher" <mboucher70 at hotmail.com>
> Subject: RE: Audi 100 Won't Start: Finally Starts !!!!!!!
> To: <quattro at audifans.com>
> Message-ID: <BAY10-DAV37JT1V9KIf00049cdf at hotmail.com>
> Content-Type: text/plain;	charset="iso-8859-1"
>
> I wired in 12 volts to the CSV and it started and ran first time.
>
> After what I thought was a sufficient time with the CSV engaged, I
> disconnected it.  Car died instantly.  Tried this and many variations and
> here is the new knowledge:
>
> The car will start and idle ok with the cold start engaged (albeit a bit
> rich?) but without it it will not run.
> For the first few minutes, any attempt to take it off idle, i.e. to press
> gently on the accelerator will kill the idle.
> After its warmed up a bit, I can operate the throttle to increase the rpm
> however I feel that this is simply added air and leaning out the mixture.
> If the throttle is opened too much it will die (presumably from too lean a
> mixture)
> During the idle I was able to check to my satisfaction that there were no
> vacuum leaks.
> During the idle, unplugging the wire to the ISV would kill the idle.  (in
> the past I seem to recall that unplugging the isv made it idle faster?)
> During the idle, unplugging the connector to the differential pressure
> regulator had no impact..
> After the car was a little warmer (i.e. needle had just started to move on
> dashboard sensor), once the cold start was unplugged the car would first
> increase in rpm (as though the mixture had been too rich and was becoming
> ideal) and then die a second later as it ran out of fuel.
>
> So where does this leave me:
> A thermoswitch that has no impact on the Cold start valve?
> A fuel injection system that seems to meter fuel through the cold start
> valve just fine but doesn't do much of anything with the other five
> injectors?
>
> Marc