Date: Thu, 1 Mar 2007 23:28:26 +0000
Reply-To: Dave Vickery <davevickery@HOTMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Dave Vickery <davevickery@HOTMAIL.COM>
Subject: Re: Common problem, I think
In-Reply-To: <de48c0be0703011433h58d00669sac19e06ed8cf9f2f@mail.gmail.com>
Content-Type: text/plain; format=flowed
I woudl say it has nothing to do with Vanagon Syndrome that is a very
specific situation caused by long periods of driving without moving the
throttle position.
I doubt it has anything to do with AFM at all as it wouldn't get bad all the
sudden. Plus everyone suspects those and it never is.
It's not going to be the 02 sensor either.
I doubt loose grounds either for a sudden onset.
Is the gas good?, near empty with water in it? If it runs crappy when you
can work on it, you could try some spraying starting fluid into the intake
and see if it revs up fine. That would narrow it down to a fuel problem. I
am definitely not the sharpest tool in this shed but maybe this will help
get some of the bigger brains to respond.
>From: mordo <helmut.blong@GMAIL.COM>
>Reply-To: mordo <helmut.blong@GMAIL.COM>
>To: vanagon@GERRY.VANAGON.COM
>Subject: Common problem, I think
>Date: Thu, 1 Mar 2007 17:33:49 -0500
>
>So, the trusty, uncomplaining engine that I feel grateful to have had for
>8k
>miles has suddenly developed a condition that I know has been described and
>discussed ad nauseam here, I think. I would call it Vanagon syndrome but it
>isn't really. Also, I have the OEM harness that is meant to cure
>"drivability issues." I have searched the archives, "the whole shebang" on
>the BDTD site and also a cursory search through the Samba. I am left not
>knowing exactly what's happening.
>
>2.1l water cooled, automatic, 160k miles
>
>engine starts as normal but whether cold or warm, when one accelerates and
>runs the RPM up to about 2500, it will go flat - loss of power. If I let of
>the throttle, it will drop to a low, erratic idle of about 800 RPM. I can
>feather the revs til it smooths out at about 1700 rpm but it will not
>return
>to idle.This is, of course, sporadic but it has not disappeared long enough
>to travel any great distance - maybe two blocks at a time without failing.
>
>Perhaps recall that I had written about this engine and that when I come to
>a stop, in gear, the idle holds high at about 1100 rpm. Tapping the pedal
>will let it drop to a consistent idle of about 950-1000 rpm.
>
>So, I'm thinking AFM or TPS mostly because of the high idle condition when
>the engine was operating well. But, does the TPS usually cause the loss of
>power (basically going flat) at higher RPMs?
>
>The engine was running perfectly on Sunday for a 160 mile jaunt back from
>the Northern Neck of Virginia. This condition appeared Wednesday morning as
>wife tried to go to work in the van. I reckon I should check the following,
>in this order:
>
>
> 1. disconnect oygen sensor
> 2. disconnect idle stabilizer valve
> 3. connections at injectors
> 4. loose grounds
> 5. TPS
> 6. AFM track and wiper
>
>Can anyone suggest a more direct troubleshooting path? Am I confusing
>symptoms by imagining the condition akin to the "syndrome"?
>Cheers,
>--
>mordo
>1990 Carat
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