CIS-e problems

[Ben Swann]

1) Brand new fuel pump for NG engine installed (actually transplanted after feew months of successful running on other car that started with a bump of the key)  Rule out the pump.  

2) System is undoubtedly getting full pressure, but may be a leakdown somewhere in the distributor itself, so leakdown test in order. I had thoroughly cleaned the fuel distributor prior to installation.

3) Yeah - removal of CS injector would tell me it is firing or not.  I suspect it isn't, because of suspected leakdown, but need to confirm.

I don't think I'll be able to do any of this before next week.

Ben
  ----- Original Message ----- 
  From: Brian Sims 
  To: Ben Swann 
  Sent: Wednesday, December 31, 2003 12:08 PM
  Subject: Re: CIS-e problems


  Some quick tests you can do would be a fuel pressure residual pressure check( if the pressure stays up) that clears the injectors and if you still have a Bosch fuel pump, the check valve.You can check the CSV quickly by removing it from the manifold (leave it plugged in)and stick a plug(cork) in its place.Place it in a jar while you crank the motor.If you get gas you can scratch that.
    ----- Original Message ----- 
    From: Ben Swann 
    To: Brian Sims 
    Cc: quattro at audifans.com 
    Sent: Wednesday, December 31, 2003 10:49 AM
    Subject: Re: CIS-e problems


    [----- Original Message ----- 
    From: Brian Sims 
    To: benswann at comcast.net 
    Sent: Wednesday, December 31, 2003 10:49 AM
    Subject: CIS-e problems
      Hello Ben, I have been watching the conversations going on about the injection problems. One of my cars had some issues lately that caused me to do a fairly comprehensive investigation into the system to correct.Could you briefly describe to me the system tests you have done?Perhaps I can help you out.

                  Brian]

      Brian,

      I have not really done a great deal of troubleshooting so far.  After I did the CIS-E-3 transplant, I had so much work left to do on the car, I set it aside to work on my Ur Quattro.  I finally have complete diagnostics manual for NG/NF engines, and just need the time to work through. I plan to resume this project in few weeks, and then can devote the time to do more methodical trouble-shooting  I've only needed to start the car to move it around every so often, so I just prime the injectors as described below.

      In my experience, this is likely injectors leaking down, or some other leakdown.  After sitting for an undetermined length of time, over 10 minutes, the engine will not start even after continuous cranking.  If I jumper the Fuel-Pump to run, and lift the airflow plate to "prime" with fuel for a few seconds, the engine starts and runs.  This tells me that there was no fuel in the lines, and there was a leakdown somewhere. If I just jumper the fuel pump to run, the engine will not start - that indicates the system is pressurized, but since the airflow plate was not lifted, no fuel got in the lines.  I think that just cranking the engine is not enough to lift the plate and charge the injector lines.  Once the engine is started, it can be turned off and re-started.

      From what I understand, the Cold Start injector line would be the same pressure as the other injector lines, and therefore, it is not pressurized either.  This would be different than the setup on the CIS-E and CIS systems, which are full system pressure - correct me if I'm wrong.

      Perhaps I'm overlooking something else.  I have installed a NG fuel pump in the 4000 Quattro that the engine transplanted.  Complete CIS-E3 wiring and AFAIK everything is hooked up properly.

      I'd be glad to hear of any other ideas i may have missed.  At present I intend to buy injectors and install them to rule this out.  

      Ben

      Overly detailed writeup on the swap:
      http://www.homestead.com/ben_swann/files/GTQswap.txt

      and the wiring:
      http://www.homestead.com/ben_swann/NGwiring.html