enigine cut every 5 sec for first 15 min

[Denis]

      ----- Original Message ----- 
      From: cobram at juno.com 
      To: sparkplugvw at hotmail.com 
      Cc: quattro at audifans.com 
      Sent: Thursday, August 26, 2004 8:30 PM
      Subject: Re: enigine cut every 5 sec for first 15 min


      "Denis" <sparkplugvw at hotmail.com> writes:
      > The engine cut maybe 1/5 sec to 3/4 seconde long. It seems its the 
      > fire cause it cut then run , cut then run.... the cut is so sharp 
      > that it cant be the fuel pump or the fuel system.

      Yes, it can, if the fuel pump cuts out car instantly dies.  Jump the fuel
      pump relay (wire across the two larger spades), if the problem stops
      you've got a bad relay, or maybe some corrosion at the fuse box.  Since
      you recently changed the fuel pump, check the wires in the trunk for
      chafing or grounding, or maybe even a loose connector at the sending
      unit. I ll look at it.
      I got that problem with my old 5000T, the engine jumped when the pump stop... but dont cut as it does on my 100Q, it s more shape.

       If the cutting out occurs during acceleration, then you might have a
      tear in the intake boot, push and lean on the boot and see if you can
      replicate the cutout or make the car stumble.
      Yes i know , i had this problem with my 90 and was the boot. But its not only on acc for the 100Q.

      Then there's also the possibility of the coil cutting out, or even the
      ignition switch...plenty in the Bentley on testing those.

      A friends 1990 100 had a similar problem recently, drove us nuts trying
      to figure it out because it was an intermittent problem...in this case it
      ended up being a bad coil.        

      I ll try again my V8 coil, its identical to mine. 

      BCNU,
      http://www.geocities.com/cobramsri/