Date: Thu, 13 Sep 2018 15:21:32 -0700
Reply-To: Don Hanson <dhanson928@GMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Don Hanson <dhanson928@GMAIL.COM>
Subject: Re: [VW gas I4 Conversions] weird engine behavior,
stops on downhill coasting, diagnostic help?
In-Reply-To: <FC4600FC-14EB-4196-A15B-11059B70C291@kublers.com>
Content-Type: text/plain; charset="UTF-8"
Thanks all. The TPS clicks correctly, but maybe it's faulty..the fuel
pressure regulator...hmm, I have no other indications of fuel problems
except when I coast, and only sometimes...all other running conditions,
everything is perfect..
Idle, full throttle, up and down, pump the gas... can't get any fueling
misbehaving anywhere.
I think I will swap the fuel pump relay and the ECU...first.
Thanks again...
On Thu, Sep 13, 2018, 2:40 PM Michael Kubler <michael@kublers.com> wrote:
> What about fuel filter? Just grasping at straws here.
>
> Mike
> 971-322-7145
>
> On Sep 12, 2018, at 19:00, Don Hanson <dhanson928@gmail.com> wrote:
>
> 84 vanagon, digifant, inline ABA Jetta motor....I've recently replaced the
> fuel pump and filter and the sparkplugs. Lubed the throttle linkage with
> light spray lube. All was normal "reading" with the spark plugs. I
> replaced the fuel pump after the old one failed (not so sure now) as I
> recall a sustained downhill just prior to the pump failure...However, I put
> on my spare and all was good, then replaced that with a new Bosch and still
> all good. The motor sounds perfect, has plenty of power, no smoking or
> missing....smoooth running and sweet sounding, as always. Same fuel
> economy....
> But I was feeling an occasional hesitation after a sustained downhill
> with no throttle, have been feeling that occasionally, but not serious,
> till it stopped recently and I swapped the fuel pump on the road, then
> replaced the spare. I've put a few hundred miles on since that, with no
> signs of what happened tonight, twice.
>
> Coastng downhill (about 6% grade) for perhaps a mile with no throttle
> at all, then step back on the gas and nothing....No warning lights, normal
> gauges temp and oil temp...just no motor...So I cycle the on off ignition
> and get a few seconds of power than sputter and dies...still coasting
> downhill...cycle again with the key and I get another burst of power, then
> off...repeat, than it clears up and continues on, but I am careful to leave
> some throttle on and no more weirdness...till I encounter another 3000"
> descent...Same deal...coast for a mile or so without any gas on and when I
> step back into it, nothing! Another 4 or 5 off and on with the key and it
> again clears up and runs normal.....No smoke or anything,
> Feels sort of like the fuel is shut off,,,but only after I coast downhill
> for a mile or two with the throttle shut....Uphill at 4000 or 5000 rpm and
> full throttle, its smooth and happy....going through the mountains in all 5
> gears like Dan Gurney, its sweet....if I keep a bit of throttle on going
> downhill, it seems to behave, but let completely off and it sometimes just
> quits, till I cycle the ignition and get it back (so far that works)
> Anybody have any ideas? I am thinking throttle stop switch or maybe
> fuel pump relay...or maybe ignition switch....Help?
> Don Hanson
>
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