Date: Thu, 26 Apr 2007 02:02:01 -0400
Reply-To: Dennis Haynes <d23haynes57@HOTMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Dennis Haynes <d23haynes57@HOTMAIL.COM>
Subject: Re: van 'stutters' and runs rich
Content-Type: text/plain; format=flowed
The severe cut out with the tach falling to "0" was not fixed by a fuel
filter. The tach falling is definitely an electrical problem. Either you are
loosing supply voltage or the hall sensor is bad or possibly the ECU.
Anyway, the ignition pulses also triggers the injectors so this is the first
problem to resolve. Extra intermittent ignition pulses also mean extra
injection pulses.
Running rich is usually traced back to the o2 sensor system. Bad chassis
connections at a few critical connections will drive the system crazy. Not
only do you need to check the connections where the terminals are screwed to
the chassis, but the crimps themselves. New crimp terminals with the built
in heat shrink can be really helpful. Check the voltage at the O2 sensor. Is
it between .2 and .8? This will tell you a lot. I doubt the AFM is the
problem. Yes they can cause some acceleration or idle problems, but if the
system is working, the O2 sensor has the final say.
Dennis
>From: Gregor Brandt <gbrandt@MARIONETTE.CA>
>Reply-To: Gregor Brandt <gbrandt@MARIONETTE.CA>
>To: vanagon@GERRY.VANAGON.COM
>Subject: van 'stutters' and runs rich
>Date: Wed, 25 Apr 2007 23:43:33 -0500
>
>'86 Westy
>
>I'ved talked about this problem before and tried the suggestions from the
>list. I have more info and a list of things done. I suspect I may have
>more than one thing wrong...but I don't know. I'm quite frustrated.
>
>This started with severe engine cutout...tach would go to 0, then back up
>to RPM, causing severe bucking. Hunted and searched and finally found
>plugged fuel filter...violent bucking went away.
>
>Only to be replaced by a gentle stutter when cruising below 3000 RPM or
>lightly accelerating up to 3000 RPM, after 3000 RPM I do not notice the
>stutter. This is not noticeable on the tach.
>
>I've tested the O2 sensor - van does same thing, plugged or unplugged.
>I've removed the Temp2 plug - van runs worse with it off
>Check timing - ok
>Fuel filters are both new
>Distributor cap looks good
>Hall Sensor getting correct current
>Jiggling wires does not increase or decrease problem.
>
>
>Could this be the AFM giving me troubles now? Van also runs very rich,
>exhaust smells like fuel.
>
>Thanks
>Gregor
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