Date: Sun, 29 Dec 2013 21:42:01 -0500
Reply-To: Dennis Haynes <d23haynes57@HOTMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Dennis Haynes <d23haynes57@HOTMAIL.COM>
Subject: Re: Timing Issues
In-Reply-To: <52C0C0CF.7000806@gmail.com>
Content-Type: text/plain; charset="US-ASCII"
Disconnecting the temp 2 sensor after the engine is running causes the ECU
to go into some type of default mode. This prevents the ignition timing from
advancing so you can get it set. Actual RPM doesn't matter much however the
idle stabilization system should still keep it close or just above the set
point and it should stay running. The 2,000 to 2,500 rpm is vague but really
a minimum. As the advance is disabled it shouldn't matter what RPM the
engine is running at. You have to have the distributor clamp set just loose
enough so you can turn it with the engine running. You can't shut off and
restart the engine with the temps 2 sensor disconnected. You need to have
the engine running, disconnect the sensor, adjust the timing. Then you can
shut the engine off, tighten the clamp, reconnect the sensor and you should
be good to go.
As for other methods of setting the timing there are some things to
consider. The factory setting has emissions and reliability in mind, not
ultimate performance. The ignition timing advance is also dependent on
temperature and it will change. That is why it was moved into the ECU. The
advance to "ping or just under method is fraught with danger. For one thing
it is very difficult to hear these engines ping. For all the local testing
you can do when you go on an extended trip, extended speed, AC on, etc. you
will be into territory you have not tested and here come those melted
pistons or thrown rods. If I recall you once had a melted piston failure,
(my memory sucks so correct me). It was not due to the brand of rebuild.
Something was wrong and it got cooked!
Dennis
-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
JRodgers
Sent: Sunday, December 29, 2013 7:40 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: Timing Issues
Thanks Mark.
I don't understand the temp II issue. For what purpose would it be unplugged
if it runs crappy at idle when trying to set the timing with the light?
I learn something new about these beasties everytime theres a problem and
have to find a fix!
Thanks again.
John
On 12/29/2013 6:21 PM, mark drillock wrote:
> Just set the timing at idle without unplugging the Temp II. I should
> have said that I guess.
>
> That should get you close enough for it to run alright unless
> something else is wrong.
>
> Mark
>
> JRodgers wrote:
>> Mark, thanks.
>>
>> Bentley says warm up, disconnect Temp II, rev to 2000/2500, set timing.
>> I needed the tach to do that. And it won't stay running long enough
>> under those conditions to get the timing adjusted. Can't get any rpm
>> out of it with the Temp II disconnected. Clearly - I must be
>> approaching this wrong or misinterpreting something.
>>
>>
>
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