Date:         Tue, 4 Feb 2003 22:30:29 -0800
Reply-To:     David Marshall <vanagon@VOLKSWAGEN.ORG>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         David Marshall <vanagon@VOLKSWAGEN.ORG>
Subject:      Re: intermittant cross-cylinder miss on I4 GX engine
Comments: To: Matt Ratto <mratto@UCSD.EDU>
In-Reply-To:  <00e701c2cc55$3ada59b0$6b2b6e89@sonyf3ks1bhv4d>
Content-Type: text/plain; charset="iso-8859-1"

Where did you mount the coil?  I have seen sparks arc from this under load -
get a spray bottle of water and spray the coil and see if it starts to miss
or if you see any blue sparks (do it at night).

David Marshall

Fast Forward Automotive Inc.
4356 Quesnel-Hixon Road
Quesnel BC Canada  V2J 6Z3

http://www.fastforward.ca    mailto:sales@fastforward.ca
Phone: (250) 992 7775        FAX: (250) 992 1160

- Vanagon Accessories and Engine Conversions
- Vanagon, Transporter and Iltis Sales and Importation
- European Lighting for most Volkswagen models

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com]On Behalf
Of Matt Ratto
Sent: February 4, 2003 5:57 AM
To: vanagon@GERRY.VANAGON.COM
Subject: intermittant cross-cylinder miss on I4 GX engine


I'm having an intermittant miss on my I4 CIS injected GX engine. Cold-start,
thermo-time switch are both working correctly, new rotor, cap, and wires, no
vacuum leaks from manifolds or injector seals. It's timed about right. Fuel
pressure is good. I've pulled the plug wires one by one and it doesn't seem
to be cylinder specific. Do any of you experts out there know if this could
be related to the Hall sensor? Do these ever partially fail?

I'm thinking it's either the hall sensor or possibly a valve problem - but
the fact that it seems to cross all cylinders seems to preclude valves. Any
recommendations?

thanks,

Matt
-------------------------------------
Matt Ratto
Ph.D. Candidate
University of California, San Diego
mratto@ucsd.edu
http://communication.ucsd.edu/mratto
--------------------------------------