[T3] Dieseling (run-on) again

[Jacob Adam Schroeder]

Hi Jim,

I just tested now (on my car in the garage, cold) and I hear the two clicks
as normal if I just turn the key to ON.

If I turn the key to ON and then OFF right away, I hear the second click as
soon as the key goes OFF.

The next time I experience the run-on, I will try this simple check and see
if I notice anything different.  This would indicate that the fuel pump
relay is sticking, correct?

Any way to check the main power relay?

Also, what kind of things could be miswired to cause this problem?

Jacob


On Sat, Aug 24, 2013 at 10:18 PM, Jim Adney <jadney at vwtype3.org> wrote:

> On 24 Aug 2013 at 20:42, Jacob Adam Schroeder wrote:
>
> > I know that FI cars should not have a run-on issue, and I believe I
> posted
> > about this issue with my 1972 FI Square before.  I am having the issue
> > again and it seems to happen most frequently after a long drive on warm
> > days.
> >
> > After doing a bit of searching, I came across somebody else (either on
> this
> > list or on samba) that was having a similar issue with their 1972 FI
> Square
> > and they replaced either their Fuel Pump Relay or their main FI relay and
> > the problem went away.  It was unclear from the post which one.
>
> If the main power relay was sticking that might cause run-on, but I'd
> suspect a mis-wiring problem just as much.
>
> When you turn the key ON, you should hear a click and a second click
> about 1 second later. If you reach under the dash and feel the fuel
> pump relay, you should feel both of these clicks.
>
> If you turn the key ON and then OFF right away you should hear and
> the feel the second click as soon as the key goes OFF. If there's a
> delay, that's the main power relay sticking.
>
> For the record, I can imagine that one of these relays could stick,
> but I've never seen it happen.
>
> --
> *******************************
> Jim Adney, jadney at vwtype3.org
> Madison, Wisconsin, USA
> *******************************
>
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