Date: Sat, 10 Oct 2009 14:14:49 -0400
Reply-To: Allan Streib <streib@CS.INDIANA.EDU>
Sender: Vanagon Mailing List <firstname.lastname@example.org>
From: Allan Streib <streib@CS.INDIANA.EDU>
Subject: Re: Warm Start Issue Likely Solved (+ temp sensor test results)
(neil n.'s message of "Sat\, 10 Oct 2009 10\:51\:08 -0700")
Content-Type: text/plain; charset=us-ascii
Those sensors, even the dealer-sourced new ones, are good for a few
years in my experience. They are unreliable enought to be worth keeping
a spare in the glove box.
neil n <musomuso@GMAIL.COM> writes:
> Hi all.
> On my Vanagon w/Jetta 2.0, I was having intermittent warm start
> problems that would cause engine to take 5+ cranking sessions to
> start. When started, it was sometimes rough, but would always feel
> "flooded" when trying to start it. Recently, it would also "hunt" at
> idle when restarted in hotter ambient temps. Being a DIY conversion,
> was concerned problem might be due to an intermittent wiring flaw or
> ?. Seems not.
> The suspect temp sensor bench tested out of spec mid range. This
> coincided with what I saw at coolant temp gauge when hard to start
> warm. In hindsight, this made total sense. The sensor was very likely
> telling the ECU to make the mix too fuel rich (Thanks Scott for the
> tip on that)
> Currently a used VW branded temp sensor is installed. No warm start
> problems so far, and no more error codes found in the OBD.
> Posting this as the ECU portion of sensor is basically the same as the
> ones used in the WBX engines. Also posting as I tested a new FLAPS
> "Standard" made in China sensor. Bought this as VW wanted $54 Cnd.,
> had to order it, and to my mind couldn't guarantee it would be OEM.
> Besides. Figured I'd test something I'd likely stand a better chance
> of finding out in the middle of nowhere.
> Results below. Seems the new sensor is close to out of spec mid-upper
> range. This might be due to my test methods though.
> No Name VW FLAPS "Standard" brand
> 21C 2900 Ohms 2300 Ohms 2500
> 27 2440 1920 2000
> 32 1940 1550 1600
> 38 1656 1300 1200
> 43 1360 1070 970
> 49 1130 890 780
> 54 932 750 620
> 60 780 640 510
> 66 666 530 420
> 71 555 450 350
> 77 470 380 290
> 82 400 325 247
> 88 337 278 222
> 93 286 240 215
> 100 217 194 204
> Neil Nicholson '81 VanaJetta 2.0 "Jaco"
1991 Vanagon GL
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