Date: Tue, 12 Sep 2006 14:44:52 +0000
Reply-To: dhaynes@OPTONLINE.NET
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Dennis Haynes <dhaynes@OPTONLINE.NET>
Subject: Re: Temp II bad [again??!!] says DigiTool [long winded]
In-Reply-To: <C12C2789.13235%thomas.myers@xerox.com>
Content-Type: text/plain; charset=iso-8859-1
The temp sensor actually sinks an amp input to ground. High readings indicate that you may have a ground circuit problem, not the sensor itself. It may be intermittent and could be caused by corroded wiring in the FI harness. Try connecting the ground side (not 5 volts) directly to ground and see if that changes things.
More likely, since you are starting OK, the lumpy idle during warm up is also due to worn injectors or carbon build up behind the valves. Any engine or inject-or in balance will show up on a cold engine also.
Dennis
----- Original Message -----
From: Thomas Myers
Date: Tuesday, September 12, 2006 9:18 am
Subject: Temp II bad [again??!!] says DigiTool [long winded]
To: vanagon@GERRY.VANAGON.COM
> I told the list back in June about my bad temp 2 sensor [ only 2
> years old]
> Thanks to DigiTool a new sensor from the dealer and a TPS alignment
> Got the van running like a top all summer.
>
> The cold mornings this month have brought back the grumpy / lumpy
>
> Start ups and random stalling.
>
>
> This mornings grumpy / lumpy start up with high idle had Digitool
> Giving me the following readings for Temp II:
>
> 4.9 with high idle. [ I think 4.9 is way off the normal scale
> for Temp II]
>
> I remember listees mentioning the wiring for the sensor
> sometimes going bad
> -
>
> So I opened up the engine lid..
>
>
> 4.9v high idle
>
> 4.9v [ wiggling sensor wiring]
>
> 4.9v [ sensor disconnected!! ???]
>
> 4.9v [ sensor reconnected]
>
> I wait a minute [ van running total of 4 minutes]
>
> And then in 3 seconds the voltage reading goes..[ with the idle
> following it
> up and down]
>
> 4.9 3.2 3.8 4.9 4. 9 2.8 3.5 2.8 2. 5 2.2 1.9
> 1.5 1.3
> [ normal for cold]
>
> And the engine runs fine at that point.
>
>
>
> So the Temp II sensor is bad again?? This one is from the dealer
> and was new
> in June!
>
> I made a joke about carrying spares but this is crazy... And why
> would I
> still get a voltage reading
>
> With the sensor plug pulled out??
>
>
>
>
> Thanks for any input.
>
>
>
> Tom Myers
> 90 Westy
> Rochester NY
> http://motsvan.blogspot.com/
>
>
>
>
>
>
>
>
>
> Thomas A. Myers
> Designer, Industrial Design Human Interface Department
> Xerox Corporation
> 1350 Jefferson Road, 801-10C
> Rochester, NY 14623
> (585) 427-5141, 8*227-5141
> Thomas.myers@xerox.com
>
> XEROX
> Technology Document Management Consulting Services
>
> www.xerox.com
>
