944 S Oil pressure gauge. - Rennlist - Porsche Discussion Forums

Notices

944 S Oil pressure gauge.

Reply

Old 08-19-2012, 07:39 AM
  #1
mike.gamble
Addict
Rennlist Member
Thread Starter
 
mike.gamble's Avatar
 
Join Date: Jul 2012
Location: Cornwall, S.W. England.
Posts: 68
Default 944 S Oil pressure gauge.

I've got a problem with my oil pressure gauge and it's something I'd like to get sorted out asap as I'd prefer to know if there were any oil pressure problems occurring whilst driving!

When I turn the ignition on, I get a full scale deflection with the needle to just above the 5 on the gauge and it then says there with no fluctuations, regardless of what the car is doing. When I turn the ignition off the needle usually drops down but, sometimes I have to tap the dash to get the needle to drop down.

I have tested the switch and everything seems fine so I'm guessing that it is a dash/gauge problem, especially due to the occasional tap needed to get the needle to drop. Is this a common fault and if so, how easy/time consuming to fix myself?
mike.gamble is offline  
Reply With Quote
Old 08-19-2012, 08:01 AM
  #2
dillon410021
Addict
Rennlist Member
 
dillon410021's Avatar
 
Join Date: Dec 2007
Location: LaPorte, IN 46350
Posts: 3,817
Default

I believe the gauge itself is bad. I had a temp gauge that would stick and you had to tap the glass. if the gauge is bouncing bad or not working at all, it could be the oil pressure sending unit
dillon410021 is offline  
Reply With Quote
Old 08-19-2012, 10:04 AM
  #3
mike.gamble
Addict
Rennlist Member
Thread Starter
 
mike.gamble's Avatar
 
Join Date: Jul 2012
Location: Cornwall, S.W. England.
Posts: 68
Default

I'd thought of that so I'd disconnected the wires from the switch and it still did it. Surely it's got to be the gauge?
mike.gamble is offline  
Reply With Quote
Old 08-19-2012, 02:02 PM
  #4
doabarrelroll
User
 
doabarrelroll's Avatar
 
Join Date: Oct 2009
Location: San Jose, CA
Posts: 640
Default

It's very possible that if you touched the oil pressure sender unit, you may have crossed the wires. When you do that, it makes the oil pressure gauge peg to 5 bar +.
doabarrelroll is offline  
Reply With Quote
Old 08-19-2012, 02:59 PM
  #5
gtroth
Addict
Rennlist Member
 
gtroth's Avatar
 
Join Date: Nov 2003
Location: CT
Posts: 1,143
Default

It would be good to measure the sensor's output voltage with a dvm.
Anyone know what that should measure for say 5 and 3 bar?
gtroth is offline  
Reply With Quote
Old 08-19-2012, 06:02 PM
  #6
mike.gamble
Addict
Rennlist Member
Thread Starter
 
mike.gamble's Avatar
 
Join Date: Jul 2012
Location: Cornwall, S.W. England.
Posts: 68
Default

What I may do then is change the wires over and see if that makes any difference but, having to knock the dash........
mike.gamble is offline  
Reply With Quote
Old 09-03-2012, 11:58 AM
  #7
Sam Minnitti
User
 
Sam Minnitti's Avatar
 
Join Date: May 2012
Location: Westchester, NY
Posts: 49
Default

Do you need to disconnect the battery before switching the wires?
Sam Minnitti is offline  
Reply With Quote
Old 09-03-2012, 01:21 PM
  #8
Techno Duck
Super User
 
Techno Duck's Avatar
 
Join Date: Jun 2003
Location: San Diego, CA
Posts: 9,923
Default

Nope, you can even do it with the car running if your brave enough .
Techno Duck is offline  
Reply With Quote
Old 09-03-2012, 03:12 PM
  #9
gtroth
Addict
Rennlist Member
 
gtroth's Avatar
 
Join Date: Nov 2003
Location: CT
Posts: 1,143
Default

You don't have to guess. You might have to clean it some to see it, but he oil pressure sender is stamped (WK & G), and the wires are color coded (BL & BL/WT):

gtroth is offline  
Reply With Quote
Old 09-03-2012, 09:54 PM
  #10
Sam Minnitti
User
 
Sam Minnitti's Avatar
 
Join Date: May 2012
Location: Westchester, NY
Posts: 49
Default

Very helpful, thank you
Sam Minnitti is offline  
Reply With Quote
 

Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
rick brooklyn
911 Forum
2
06-11-2017 02:04 PM
yoramw
944 Turbo and Turbo-S Forum
2
06-01-2016 11:54 PM
FredR
928 Forum
14
12-16-2015 02:00 PM
SQLGuy
928 Forum
32
10-30-2010 10:45 PM
rnln
911 Forum
12
12-19-2008 09:55 PM


Thread Tools
Search this Thread
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump


All times are GMT -3. The time now is 04:29 AM.


Copyright ę 1998 - 2017 Rennlist.com
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: