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Date:         Sun, 1 May 2005 23:12:36 -0400
Reply-To:     Dennis Haynes <dhaynes@OPTONLINE.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Dennis Haynes <dhaynes@OPTONLINE.NET>
Subject:      Re: westy cold = rich
Comments: To: Mark Keller <kelphoto@TELUS.NET>
In-Reply-To:  <4275325E.5000604@telus.net>
Content-type: text/plain; charset=us-ascii

I have never seen a temp 1 sensor go bad and the temp 2 sensors are not wear or even common failure items. I think I have changed 5 or 6 in all the Vanagons I've worked. The one in Fun Bus went flaky on me at around 214k. Most of the time, problems with the temp 2 sensor is due to the wiring or the connector. The connector parts are notorious for corrosion and merely disconnecting and reconnecting will often restore proper operation. Replace the contacts in the plug assembly or replace the complete plug. Except for color, it is the same plug that is used for the injectors and the FLAPS will have these as they are also used on GM cars.

As for the fuel pressure regulator, they work or they don't. A bad regulator is usually a ruptured diaphragm, obvious by the fuel leaking into the vacuum hose going into the manifold.

Dennis

-----Original Message----- From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of Mark Keller Sent: Sunday, May 01, 2005 3:48 PM To: vanagon@GERRY.VANAGON.COM Subject: westy cold = rich

Well on the surface the symptoms match a faulty Temp I sensor, The Temp II is a good just replace because item. I had them fail with out to much warning, especially when a change in temperature occurs.

According to Darrell Boher's (sp) report and testing, The Temp I sensor is a bit of a wildcard, in Pre Digifant ECU's it is more agressive in the start up fuel map, than Digfanc ECU's, in which it's mostly ignored until air temp is below 32 f.

Having said that, if your fuel pressure regulator is out of specifications on the high side when cold starting, ie somewhat to much fuel pressure, and The Temp I and Temp II are affecting the fuel map, ie the amount of millseconds the injectors are turn on, for the cold start, then you could easliy have a funky running motor, until the Temp II starts to Come up to it's first reconizable input for reduction in the fuel map.

An aftermaket Temp II, I had, when tested against the VW Temp II (of the same application) took about two minutes longer to reach this first level of input. Since then I only run VW mfg TEMP II sensors, even though I get only 8 monthes to 24 monthes service. Change em when you change your coolant,.

So if this Westy has the aftermaket style Temp II, or a Fuel Pressure Regulator That is High, confirm by testing after a overnight cold soak, This is one possible, but subtle, cause.

Also a maladjusted AFM spring-- a good thing to verify that it is set. Should yeild a .3 -.7 volts reading on the sensor lead, on a fully warm engine that is above 3000 rpm with a load, and the O2 sensor is disconnected. Remember that pre cat vanagons operated this way their whole life, just AFM spring tension and no O2 sensor

Mark


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