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Date:         Sat, 10 Oct 2009 14:14:49 -0400
Reply-To:     Allan Streib <streib@CS.INDIANA.EDU>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Allan Streib <streib@CS.INDIANA.EDU>
Subject:      Re: Warm Start Issue Likely Solved (+ temp sensor test results)
Comments: To: neil n <musomuso@GMAIL.COM>
In-Reply-To:  <c4e7c5f90910101051y5733c0a0g3360a48ab32e3943@mail.gmail.com>
              (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. > > Neil. > > > 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" > > http://tubaneil.googlepages.com/ > > http://groups.google.com/group/vanagons-with-vw-inline-4-cylinder-gas-engines >

-- 1991 Vanagon GL


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