[928uk] NTC2 variants - was Cheap LH-Jetronic temp sensor II NTC2

Fri Jun 7 09:47:20 UTC 2024

Oh, I wonder how many other people have thought their FAE 33090 was faulty
because they measured across both terminals!

Best regards
Jonathan

1991 928 GT Amethyst Metallic

On Thu, 6 Jun 2024, 7:17 pm Paul Lacey via 928uk, <928uk at lists.928.org.uk>
wrote:

> Hi Vince,
> The TII sensor contains two separate NTC sensors, each of the two pins
> connects to one sensor, the other side of both sensors is ground - the
> brass part.
> So if you measure across the two pins you are measuring both sensors in
> series which will be double the resistance. To measure correctly you
> measure from each pin to the brass ground. So what you measured is correct.
> The range for each sensor is:
> 0C 4.4 - 6.8 KOhms
> 15 to 30C 1.4 - 3.6 KOhms
> 40C 0.9 - 1.3 KOhms
> 60C 480 - 720 Ohms
> 80C 250 - 390 Ohms
> 100C 100 - 210 Ohms
>
> So at your 23C room temp 1.7K looks good. Both sensors must always measure
> almost identical resistance.
>
> Paul L
>
> -----Original Message-----
> From: 928uk [mailto:928uk-bounces at lists.928.org.uk] On Behalf Of Vince
> Dallimore via 928uk
> Sent: 06 June 2024 13:45
> To: jonathan at rackowe.net
> Cc: jonathanrackowe at gmail.com; 928 List
> Subject: Re: [928uk] NTC2 variants - was Cheap LH-Jetronic temp sensor II
> NTC2
>
> H each,
>
> My two penneth!
>
> I have an FAE T11  33090 stat in front me; at room temperature of 23c I
> read 3.42k ohms across the contacts and 1.7k ohms either contact to brass
> base, does that make sense?
>
> Regards,
>
> Vince Dallimore
> M: +44 7798 630649
>
> Sent from my mobile
>
>
>
>
> On 6 Jun 2024, at 13:09, jonathanrackowe--- via 928uk <
> 928uk at lists.928.org.uk> wrote:
>
> It must have 33090 stamped on it as well Simon. FAE make a lot of temp
> sensors, and NTC resistors come with all sorts of temp-resistance curves.
>
>
>
> Best regards,
>
> Jonathan
>
>
>
>
>
>
> From: Simon Painter <simonpainter101 at gmail.com>
> Sent: 06 June 2024 12:14
> To: jonathan at rackowe.net; 928 List <928uk at lists.928.org.uk>
> Cc: Paul <ukkid35 at gmail.com>
> Subject: Re: [928uk] NTC2 variants - was Cheap LH-Jetronic temp sensor II
> NTC2
>
>
>
> The temperature when hot is just as important.
>
>
>
> I’ve just checked the two new, out of spec ones I have and neither have
> FAE stamped on them. I’m sure I ordered an FAE, but hey…..
>
>
>
> I’ll order a proper FAE item and see how that measures up.
>
>
>
> Thanks
>
>
>
> Simon.
>
>
>
>
>
> On 6 Jun 2024, at 11:24, jonathanrackowe at gmail.com <mailto:
> jonathanrackowe at gmail.com>  wrote:
>
> 
>
> Yesterday I measured my spare FAE 33090 and my original Bosch Temp sensor
> 2 from my 928 GT. Both measured the same: 2.4KΩ at ambient temperature.
>
>
>
> My FAE 33090 came in an FAE box and it has FAE 33090 stamped on the brass
> housing.
>
>
>
> I have an FAE 33090 fitted Feb 2023 in my 928 GT and the rebuilt engine is
> running fantastically with it 😊
>
>
>
> Bit confused by people saying they have out of spec FAE 33090 sensors.
>
> Best regards,
> Jonathan
>
> 1991 928 GT Amethyst Metallic
>
>
>
>
>
> From: jonathan at rackowe.net <mailto:jonathan at rackowe.net>
> Sent: 02 June 2024 10:21
> To: Simon Painter <simonpainter101 at gmail.com <mailto:
> simonpainter101 at gmail.com> >; jonathan at rackowe.net <mailto:
> jonathan at rackowe.net>
> Cc: Paul <ukkid35 at gmail.com <mailto:ukkid35 at gmail.com> >; 928 List <
> 928uk at lists.928.org.uk <mailto:928uk at lists.928.org.uk> >
> Subject: RE: [928uk] NTC2 variants - was Cheap LH-Jetronic temp sensor II
> NTC2
>
>
>
> I’ve retitled this thread NTC2 variants, got rid of all the reply arrows
> (please turn these off if you can), and snipped last year’s stuff as the
> thread had become huge and difficult to read.
>
>
>
> My 928 GT has an FAE 33090 that I fitted last Feb. It measured within spec
> at garage temp (around 15C) back then, and the car runs fine with it. I
> didn’t check it at higher temperatures. It has ‘FAE 33090’ stamped on the
> brass housing.
>
>
>
> Simon, is your FAE sensor a 33090? Does it have ‘FAE 33090’ stamped on the
> brass housing? Where did you buy it?
>
> Best regards,
> Jonathan
>
> 1991 928 GT Amethyst Metallic
>
>
>
>
>
>
>
>
>
> From: Simon Painter <simonpainter101 at gmail.com <mailto:
> simonpainter101 at gmail.com> >
> Sent: 02 June 2024 08:40
> To: jonathan at rackowe.net <mailto:jonathan at rackowe.net>
> Cc: Paul <ukkid35 at gmail.com <mailto:ukkid35 at gmail.com> >; 928 List <
> 928uk at lists.928.org.uk <mailto:928uk at lists.928.org.uk> >
> Subject: Re: [928uk] Cheap LH-Jetronic temp sensor II NTC2
>
>
>
> The FAE Temp2 sensor reads:
>
>
>
> 20C - 5.3k
>
> 32C - 4k
>
> 46C - 2.4k
>
> 60C - 1.5k
>
> 70C - 0.93k
>
>
>
> I was quite surprised how the Temp2 sensor affects starting. I have an
> ongoing issue with re-starting when hot, eg re-starting after filling fuel.
> It will turn over quite slowly compared to a cold start. One day after a
> fuel stop, I unplugged the Temp2 connector and just plugged in a new FAE
> sensor and left it hanging loose. The engine turned over really quickly! It
> didn’t want to start as it was probably running with a super rich mixture
> as the Temp2 sensor was cold and engine hot.
>
>
>
> I’m pretty sure my original Bosch Temp2 sensor is causing my hot re-start
> issue but I have yet to find a good replacement that is in spec.
>
>
>
> Thanks
>
>
>
> Simon.
>
> Check me out on Instagram and Facebook @oldcarfixer
>
>
>
>
>
> On 1 Jun 2024, at 23:41, Jonathan Rackowe <jonathanrackowe at gmail.com
> <mailto:jonathanrackowe at gmail.com> > wrote:
>
> 
>
> What does your FAE one measure Simon?
>
>
>
> Best regards
>
> Jonathan
>
>
>
> 1991 928 GT Amethyst Metallic
>
>
>
>  _____
>
>
>
> On Sat, 1 Jun 2024, 3:55 pm Simon Painter, <simonpainter101 at gmail.com
> <mailto:simonpainter101 at gmail.com> > wrote:
>
> I’ve now bought two (one an FAE) and both measure way off what they are
> supposed to be. I’m trying to get gold of an original Bosch one.
>
> Thanks
>
> Simon.
>
>  _____
>
>
> -----Original Message-----
> On 1 Jun 2024, at 15:51, Jonathan Rackowe via 928uk <
> 928uk at lists.928.org.uk <mailto:928uk at lists.928.org.uk> > wrote:
>
> Definitely one to return as defective.
>
> Maybe Vince can sell you one of the several FAE ones that he bought to
> keep them in the 928 community.
>
>
>
> Best regards
>
> Jonathan
>
>
>
> 1991 928 GT Amethyst Metallic
>
>
>
>
>
>
> -----Original Message-----
> On Sat, 1 Jun 2024, 3:42 pm Paul, <ukkid35 at gmail.com <mailto:
> ukkid35 at gmail.com> > wrote:
>
> 15C - 6k
> 60C - 1.2k
>
> Both circuits measured the same, on old and new sensor
>
>
> Paul
>
>
>
>
> -----Original Message-----
> On Sat, 1 Jun 2024 at 15:36, Jonathan Rackowe <jonathanrackowe at gmail.com
> <mailto:jonathanrackowe at gmail.com> >
> wrote:
>
> What were your measured results at 15C and 60C Paul?
>
>
>
> Best regards
>
> Jonathan
>
>
>
> 1991 928 GT Amethyst Metallic
>
>
>
>
>
> -----Original Message-----
>
> On Sat, 1 Jun 2024, 1:20 pm Paul, <ukkid35 at gmail.com <mailto:
> ukkid35 at gmail.com> > wrote:
>
>
>
> Sadly the Lemark sensor I bought is faulty, or at least off spec
>
>
>
> I compared it with the old one, and with the specs, and found that the new
> sensor reads approximately double the resistance that it should, checking
> at 15C and 60C
>
>
>
> The Temp Sensor II resistance measurements should be:
>
> 0 C / 32 F:  4.4k to 6.0k Ohms
> 15 - 30 C / 59 - 86 F: 1.4k to 3.6k Ohms
> 40 C / 104 F: 0.9 to 1.3k Ohm
> 60 C / 140 F: 480 to 720 Ohms
> 80 C / 176 F: 250 to 390 Ohm
>
>
>
> Disappointing
>
>
>
> Paul
>
> 87 S4 Manual
>
>
>
>  _____
>
>
>
>
>
> -----Original Message-----
> On Mon, 20 May 2024 at 17:47, <jonathanrackowe at gmail.com <mailto:
> jonathanrackowe at gmail.com> > wrote:
>
> Hi Paul,
>
>
>
> That's a Lemark one, not an FAE33090, but it'll probably work just as well
> and good to have any version as a spare.
>
>
>
> Best regards,
>
> Jonathan
>
>
>
> 1991 928 GT Amethyst Metallic
>
>
>
>
>
>
>
> -----Original Message-----
>
> From: 928uk <928uk-bounces at lists.928.org.uk <mailto:
> 928uk-bounces at lists.928.org.uk> > On Behalf Of Paul via 928uk
>
> Sent: 20 May 2024 14:46
>
> To: 928uk at lists.928.org.uk <mailto:928uk at lists.928.org.uk>
>
> Subject: Re: [928uk] Cheap LH-Jetronic temp sensor II NTC2
>
>
>
> A week ago I drove back from Germany in my other car, which had suffered a
>
> coolant temp sensor failure, not a pleasant or relaxing experience, as the
>
> rad fans never came on
>
>
>
> I don't want to risk the same in the 928 so I've just bought an FAE 33090,
>
> for the same price as last year, result!
>
>
>
> https://www.ebay.co.uk/itm/355597952746
>
>
>
> Paul
>
> 87 S4 Manual
>
>
>
>
>