Date:         Fri, 4 Aug 2006 07:43:37 -0700
Reply-To:     Zoran Mladen <zmaninco@YAHOO.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Zoran Mladen <zmaninco@YAHOO.COM>
Subject:      Strange no start problem - issue with fuel pump relay - input
              requested!
In-Reply-To:  <04c701c6b688$53f23eb0$2f01a8c0@FirstLaptop>
Content-Type: text/plain; charset=iso-8859-1

Hi folks!

  Having a strange issue with an 88 Vanagon non-westy non-syncro.  It did not want to start.  We replaced the fuel injection relay and it started and ran nicely.  We drove it about 5 miles and it died and refused to start.  It is not getting fuel pressure and no fuel injector pulsing.  Looking at the wiring diagram in Bentley we found an error.  The Bentley claims that the "juice" for the injectors (which is delivered when the key is on) comes from the fuel injection relay.  This is not true!  It comes from the fuel pump relay.  We verified that with a couple old harnesses as well.

  At any rate, if we jumper (30 to 87) the fuel pump relay, we get fuel pressure, the fuel injectors pulse, and the car starts right up.  Doing more tests, we know that the fuel injectors are getting the proper ground signal from the ECM - hence the hall sender and all wiring is working - but not getting juice, which is triggered by a hot wire to the relay coming from the ECU.  The ground is at the relay, but no juice to activate the relay.

  Also, with the car running (with the fuel pump relay jumpered), the fuel injection relay gets very hot.

  At this point, I am thinking there is either a problem in the ECU or in the harness.  Perhaps some melted wires, causing the "no juice" from the ECU as well as causing the fuel injection relay to get hot.  Do folks agree?  Disagree?  Love to hear opinions.

  Thanx!

Z


---------------------------------
How low will we go? Check out Yahoo! Messenger’s low  PC-to-Phone call rates.