Pelican Parts
Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help

Go Back   Pelican Parts Forums > Porsche Forums > Porsche 911 Technical Forum

LinkBack Thread Tools Rate Thread
Thread Post New Thread    Reply
Registered User
Join Date: Mar 2014
Location: orange county ca
Posts: 3
oil pressure sending unit help

hey guys,

my druck press gauge reading is stuck at 0-0.5 and I'm out of ideas, I suck at electrical troubleshooting, please help.

engine running at idle, wire on sensor gauge shows = 0
engine running at idle, wire not on sensor gauge shows = 5
engine running at idle, wire grounded on the engine gauge shows = 0

tested sender unit itself by placing red lead to the sender's prong and black lead to ground, started car and measured resistance in Ohms. I was told if I got fluctuating readings with changes in rpm, sender is good. if sender is bad it should read infinity. I got fluctuating readings, so I assume my sender is good.

battery reads 12.5v, so I assume my alternator is still good.

I thought maybe the female connector was too loose, so I ran a separate wire connecting the female connection to the sender's prong, started the car and still got a reading of 0.

suggestions anyone?

Old 03-24-2014, 11:09 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #1 (permalink)
Information Junky
island911's Avatar
Join Date: Mar 2001
Location: an island, upper left coast, USA
Posts: 57,304
If you take the green/red (iirc) wire off of the Oil Pressure Sensor (just right of the engine fan, 7mm nut) your dash-gauge should peg up to the top. That is, the gauge reads resistance to ground. -if that wire goes directly to ground, the gauge should read zero(ish) and if not connected it should read max.

ps, there's this Oil temp & pressure gauge / sender operation
Everyone you meet knows something you don't. - - - and a whole bunch of crap that is wrong.
Disclaimer: the above was 2 worth.
More information is available as my professional opinion, which is provided for an exorbitant fee.
Old 06-02-2014, 10:16 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #2 (permalink)
ROW '78 911 Targa
timmy2's Avatar
Join Date: Jul 2011
Location: Salem, OR
Posts: 9,050
The senders have a habit of breaking/ corroding at the threaded brass portion where the nut goes on to secure the terminal stud.
Try using a little bit of solder and a soldering gun on the end of the threaded brass (get it good and hot) and see if it works again.

Sent from my iPhone using Tapatalk
Euro 1978 SC Targa, SSI's, Dansk 2/1, Bitz kit EFI.
Need a New Wiring Harness? PM or e-mail me. Search for "harnesses" in the classifieds.
Old 06-02-2014, 10:42 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #3 (permalink)
Registered User
T77911S's Avatar
Join Date: Oct 2006
Location: MYR S.C.
Posts: 13,586
if the gauge reads 0 with the wire connected and 5 with it removed, the sender is bad, just buy a new one.

86 930 42kmiles [__] RUNNING:[__] NOT RUNNING: ____77 911S widebody: SOLD
88 BMW 325is 200K+ SOLD
05 BMW 330CI 130K:: [__] RUNNING: [__] NOT RUNNING:
08 VOLVO V70 190K:: [__] RUNNING: [__] NOT RUNNING:
Old 06-03-2014, 03:15 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #4 (permalink)

Thread Tools
Rate This Thread
Rate This Thread:


druck , gauge , oil , pressure

All times are GMT -8. The time now is 05:44 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2020 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page

DTO Garage Plus vBulletin Plugins by Drive Thru Online, Inc.