[T3] Engine Craziness (was Dwell Meter...)

[Mike Fisher]

Mine starts/runs but only runs Good when it's warmed up to operating
temperature!

On Thu, Mar 1, 2012 at 4:40 PM, Tony Rongey <trongey at sbcglobal.net> wrote:

> I actually spliced my injector grounds and ran them to the ground lugs on
> the
> top of the case for that reason.  I'll check it this weekend though.
>
> Tony
>
>
>
>
> ________________________________
> From: Jim Adney <jadney at vwtype3.org>
> To: type3 at vwtype3.org
> Sent: Wed, February 29, 2012 10:31:41 PM
> Subject: Re: [T3] Engine Craziness (was Dwell Meter...)
>
> On 26 Feb 2012 at 7:20, Tony Rongey wrote:
>
> > - When cold the engine starts immediately, but will die if I let the
> RPMs drop
>
> > below about 1400.
> > - After a few minutes, when the engine is about half warmed up, it will
> cough,
>
> > sputter, and probably die if RPMs drop below 1500.  After it dies it
> restarts
> > easily.
> > - Once the engine is fully warmed up it runs great and idles pretty
> well.  If
> >it
> >
> > shut it off at this point I'll have to crank for at least half a minute
> before
>
> > it will start, and if I'm making multiple stops around town then every
> restart
>
> > is harder than the one before.
> > This behavior has been consistent on three or four trips since I got it
> running
> >
> > again.
>
> I've had more time to thing about this, and I'm reminded that you
> said this car has a '69 FI system. In that case, I suspect that
> you're experiencing bad grounds for the injectors, causing cylinders
> to miss as the heads heat up and the injectors lose their grounds.
>
> On '68-9 FI cars, the injectors each have one side going to ground
> via a single ground connection to a screw into the head, near the
> injectors. Heat cycling makes this connection become intermittent and
> this may be your problem. I suggest that you find those wires and
> loosen and retighten that screw. This WILL NOT be a permanent fix,
> but it should make the engine run better temporarily. If this
> improves things, I have special washers that you can put under the
> screw heads to cure this permanently.
>
> Look for those screws, tighten them, see if it helps, and email us
> back the results. Even if it's not clear that this is the problem, I
> still recommend that you install these special washers. They are
> cheap.
>
> Everyone out there with a FI 68 or 69 should install a pair of these,
> even if you don't think you have a problem.
>
> VW changed things in '70, moving the ground wires to the center of
> the case, where the heat cycling is much milder. These later cars do
> not have this problem.
>
> --
> *******************************
> Jim Adney, jadney at vwtype3.org
> Madison, Wisconsin, USA
> *******************************
>
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-- 
Eugene, Oregon

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