Date:         Mon, 23 Jun 2008 15:34:48 -0700
Reply-To:     neil N <musomuso@GMAIL.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         neil N <musomuso@GMAIL.COM>
Subject:      Re: Engine (VanaJetta) won't shut off when hot.
Comments: To: Greg Potts <greg@pottsfamily.ca>
In-Reply-To:  <48601B40.4060009@pottsfamily.ca>
Content-Type: text/plain; charset=ISO-8859-1

Thanks Greg.

Pretty sure it isn't dieseling. But thanks for throwing it out there!

Really can't see any other wiring problems related to this issue, so
will try a spare fuse. The one in there right now is a Hella 40 amp
with both the 86 and 86a terminals. Who knows, it could be hinky.

But much like the engine portion of wiring harness, I'm going over and
over stuff until it's dead on.

Thanks,


Neil.

On Mon, Jun 23, 2008 at 2:53 PM, Greg Potts <greg@pottsfamily.ca> wrote:
> Hi Neil,
>
> Is it running on because the ignition is still on, or is it "run-on" caused
> by pre-ignition AKA dieseling???
>
> It's quite possible for a hot engine to continue to run without spark.
> Usually that's a sign of WAY too much heat in the combustion chamber, whch
> could be caused by a lean-running FI/Carb, bad timing, the wrong spark-plug
> or some other malfunction.
>
> Most of the Bosch FI systems I know of should have provisions to prevent
> dieseling but I am not sure if yours is one of them, so I thought I'd throw
> this out there.
>
> Happy Trails,
>
> Greg Potts
> 1973/74/79 Westfakia "Bob the Tomato"
> 1987 Wolfsburg Weekender Hardtop
> www.busesofthecorn.com
> www.pottsfamily.ca
>
>
> neil N wrote:
>>
>> Hi all.
>>
>> Just took my VanaJetta for a real test run. Runs much better now!
>>
>> Ignition switch is fairly new, worked fine before conversion, and if
>> "new" engine cold-warmish, works fine.
>>
>> When engine hotter after short hwy. run, it won't shut off.
>>
>> I put in a separate relay to supply power to Jetta ignition coil.
>>
>> I suspect heat as the culprit.
>>
>> If a relay gets too warm-hot, would this cause it to stay "on"?
>>
>> Here's a pic of relay box/exhaust:
>>
>> http://tubaneil.googlepages.com/exhaust.jpg/exhaust-full;init:.jpg
>>
>> Maybe relay box is too close to exhaust or exhaust too exposed.
>>
>> Would a heat shield on exhaust or relay box help that much?
>>
>>
>



--
Neil Nicholson '81 JettaWesty "Jaco
http://groups.google.com/group/vanagons-with-vw-inline-4-cylinder-gas-engines
http://web.mac.com/tubaneil
http://tubaneil.googlepages.com/