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Oil pressure sensing gauge reading full scale - problem is...?

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Old 01-24-2018, 11:53 PM
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Ducman82
 
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whats the resistance in the 14 pin wires? blue/black and blue/white, to the 14 pin terminals?
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Old 01-25-2018, 02:07 PM
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Can you provide pics of the connectors and wiring too?
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Old 01-25-2018, 03:55 PM
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Originally Posted by Mongo
Can you provide pics of the connectors and wiring too?
at the oil pressure sensor, or the 14pin connector? (both?)
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Old 01-25-2018, 08:16 PM
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Originally Posted by mark kibort
Really?

I did some testing last night. its pegged with the key on .. then, i tap 14pin connector (10 from the left) and it goes to zero. turn the key off, it goes to zero. turn the key on, it goes up a few mm...... start the car and it peggs to 5 bar.... turn the car off, and its stuck at 5bar..... tap the 14pin connector, and it falls back. did it a few times and its still pegging at start, but falls to zero after turning off.

oil pressure sensor?
sender wires look nice and covered. wires in good shape, connections good and tight. insulation good.
as a trouble shoot...with a bit of research (wiring diagrams) you couldperhaps build a set of jumper leads and go directly from the installed sensor to the connection in the pod, by passing the in car wiring and any issues
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Old 01-25-2018, 08:29 PM
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Originally Posted by Tony
as a trouble shoot...with a bit of research (wiring diagrams) you couldperhaps build a set of jumper leads and go directly from the installed sensor to the connection in the pod, by passing the in car wiring and any issues
What about a test at the sensor? that way, if running , we see a specific voltage or resistance and can determine if it is good or not.
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Old 01-25-2018, 08:39 PM
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Originally Posted by mark kibort
What about a test at the sensor? that way, if running , we see a specific voltage or resistance and can determine if it is good or not.
Mark, this might be an option, it worked for me.
I did all the leg work and it all came back to a bad sender, even though the sender wasn't more then a year or two old.

http://www.lindseyracing.com/LR/Parts/944OILADAPT.html
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Old 01-25-2018, 09:04 PM
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Originally Posted by mark kibort
What about a test at the sensor? that way, if running , we see a specific voltage or resistance and can determine if it is good or not.

i rigged my new sensor up with jumper wires to the factory wires as i sat in the seat...turned on the key..blew 60 PSI of air into the sensor...spot on 4 bar on the gauge....knew it was a good sensor as well as the gauge in the pod being accurate. Any issue from then on was wiring. Pull your old installed sensor out and do the same thing. (just dont strip the threads on the block)
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Old 01-26-2018, 02:21 PM
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Originally Posted by Crumpler
Mark, this might be an option, it worked for me.
I did all the leg work and it all came back to a bad sender, even though the sender wasn't more then a year or two old.

http://www.lindseyracing.com/LR/Parts/944OILADAPT.html
thats a good idea... but if the sensor was bad, why not just replace the sensor?
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Old 01-26-2018, 03:29 PM
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Originally Posted by mark kibort
thats a good idea... but if the sensor was bad, why not just replace the sensor?
I had other issues giving me problems. Just suggesting that hopefully it's the sender giving you the wrong numbers on the cluster gauge.
Sender, until proven otherwise seems to hold true. Chronicled in this "low pressure, high pucker" thread;

https://rennlist.com/forums/928-foru...essure-s3.html
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Old 01-26-2018, 03:51 PM
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Originally Posted by mark kibort
at the oil pressure sensor, or the 14pin connector? (both?)
Sure both. Second set of eyes helps... Or however many eyes look at this thread
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Old 01-26-2018, 05:25 PM
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Originally Posted by James Bailey
Does it not concern you that "tapping on the 14 pin connector" changes things ???? Generally speaking good solid electrical connections and wiring are by design not effected by vibration or TAPPING...
I don't think he is interested in logic.
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Old 01-26-2018, 05:44 PM
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Originally Posted by Imo000
I don't think he is interested in logic.
Yes, i am interested in logic... there is a logical explanation why a tapping can cause this seemingly capacitance like observation to occur. this doesnt seem like a bad connection. its more than likely the sensor itself. a few "logcial" tests should determine this.
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Old 01-26-2018, 05:46 PM
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Originally Posted by Mongo
Sure both. Second set of eyes helps... Or however many eyes look at this thread
yes, it all helps... by the way, i was mistaking the 14pin connector with the 10pin connections below the fuse and relay panel... where is the 14 piin connector? is that the ribbon connector under the hooded console on the dash ?
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Old 01-26-2018, 05:54 PM
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Originally Posted by Crumpler
I had other issues giving me problems. Just suggesting that hopefully it's the sender giving you the wrong numbers on the cluster gauge.
Sender, until proven otherwise seems to hold true. Chronicled in this "low pressure, high pucker" thread;

https://rennlist.com/forums/928-foru...essure-s3.html
that was a good read . so did it turn out to be the sender? was it hard to pull the sender.. doesnt look like a lot of room in there.
where is the 14pin connector?
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Old 01-26-2018, 06:01 PM
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The 14 pin is the front engine harness to the fender well near the jump start post the harness that has the oil sending unit wires inside.....SO WHERE WERE YOU TAPPING ???
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