[T3] Dieseling (run-on) again

[Jacob Adam Schroeder]

Interesting, so because Jim and Dennis both mentioned a leaking injector, I
wonder if that could be it as well.  Especially in view of the fuel
pressure issues I seem to be having (see my post of a few moments ago).  I
will check my injectors and see if any appear to be leaking.  I guess I
should probably check the cold start injector as well.

Thanks for all the advice of places to check, when I drive to work on
Monday I'll try to be more observant of what is happening (relay-wise) when
the car runs on.

Jacob


On Sun, Aug 25, 2013 at 7:23 AM, Jim Adney <jadney at vwtype3.org> wrote:

> On 24 Aug 2013 at 23:14, Jacob Adam Schroeder wrote:
>
> > 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.
>
> Okay, that sounds normal, but I understand that this is an
> intermittent problem. I suggest you get in the habit of grabbing the
> pump relay every time you shut the engine off, in order to try to
> catch it when it runs on.
>
> > 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?
>
> If the main relay sticks, that delay will cascade down to the pump
> relay, too. So checking the pump relay checks the whole chain. If
> it's just the pump relay that's sticking, then that would keep the
> pump running, but with the main power off the injectors will stop, so
> the engine should stop.
>
> IF you have a leaking injector, that could keep the engine running
> (sort of) even with all the relays off.
>
> > Any way to check the main power relay?
>
> The test above does that.
>
> > Also, what kind of things could be miswired to cause this problem?
>
> It would have to be something that fed power to the FI even with the
> main power relay off. That would have to be either at the main relay
> or where the 2 wires at the far LF corner of the engine compartment
> join the 2 white wires in the FI wiring harness. (That's where the
> power from the relay gets into the FI system.)
>
> Other symptoms that might lend a hint to the problem would be poor
> gas mileage or a battery that seems to run down quickly while parked.
>
> --
> *******************************
> Jim Adney, jadney at vwtype3.org
> Madison, Wisconsin, USA
> *******************************
>
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