CIS-e problems

[Ben Swann]

[----- 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