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 > 911 / 930 Turbo & Super Charging Forum


Reply
 
LinkBack Thread Tools Rate Thread
Author
Thread Post New Thread    Reply
Registered User
 
Join Date: Dec 2004
Posts: 189
Garage
Question Druck Pressure Guage not working

I have a Druck Pressure gauge causing me problems on my '76 911. It was working fine and then started going above 5 as soon as I turned the key on. Last winter I sent the gauge to North Hollywood Speedo and they sent it back saying that there was no problem with the gauge. I just took the gauge to my mechanic for install and it is doing the same "top" out above 5.

So, my mechanic says it's the gauge and NHS says it's fine. Any ideas out there?

Thank you,
Dan

Old 05-04-2018, 09:46 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #1 (permalink)
Registered User
 
Jeff NJ's Avatar
 
Join Date: Nov 2013
Location: NW NJ
Posts: 1,229
I believe NHS. I would bet the pressure sensor on the motor is bad, or a bad connection. Most likely a bad connection between the sensor and gauge. Have you tested that?
__________________
1988 930 Venetian Blue
Old 05-04-2018, 10:59 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #2 (permalink)
Registered User
 
Join Date: Dec 2004
Posts: 189
Garage
Jeff, evidently when power wire is connected to the gauge with no other connections, the gauge needle moves above 5. (I need to pull the gauge to verify, but that is what my mechanic has told me.) If this is true, what does this mean?
Old 05-04-2018, 11:08 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #3 (permalink)
Mighty Meatlocker Turbo
 
Rawknees'Turbo's Avatar
 
Join Date: Apr 2016
Location: North TexASS
Posts: 13,552
When the gauge pegs with the key on (top of its range) that means you have an open circuit (broken electrical path from the sender).

First, unhook the wire from the sender and test for continuity through the sender and ground (with a multimeter) - no continuity means sender is bad (open circuit within it).

You can also then ground the removed sender signal wire to verify the gauge is working or that you do not have a short to ground somewhere else between the sender and the gauge - grounded sender wire will peg the gauge a zero. If you remove the wire from the sender and do not ground the wire end, and the gauge does not go to the top of the range, you have a short to ground in the wire someplace between the wire end and the gauge.
Old 05-04-2018, 11:19 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #4 (permalink)
Registered User
 
Jeff NJ's Avatar
 
Join Date: Nov 2013
Location: NW NJ
Posts: 1,229
Here is a good thread that describes your exact issue and how he solved it. For him it was the sending unit.

Oil Pressure Sending Unit Replacement
__________________
1988 930 Venetian Blue
Old 05-04-2018, 11:21 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #5 (permalink)
Registered User
 
Join Date: Dec 2004
Posts: 189
Garage
Thanks, guys. I'll proceed with your advice. Much appreciated.
Old 05-04-2018, 01:41 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #6 (permalink)
 
Registered User
 
mark houghton's Avatar
 
Join Date: Jul 2008
Location: Central Washington State
Posts: 3,873
You need to change mechanics. He didn't even bother to consider that the sender might be the culprit. And re-installing said gauge....well now, that takes about 30 seconds at $150/hour....do the math.
Sorry, I'm out of line here. Not everyone is a DIY sort of person. It's just me....I don't have a "mechanic" and never will, mostly because I'm capable and otherwise don't trust anyone but me. I guess that makes me a narcissist.
__________________
Mark H. 1987 930, GP White, Wevo shifter, Borla exhaust, stock everything else. The result of a massive Pelicanite good will fire recovery effort. Truely an open book, ready for the slippery slopes to modification.
Old 05-04-2018, 06:28 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #7 (permalink)
Old car guy.....
 
Hot Euro's Avatar
 
Join Date: Mar 2014
Location: Lubbock, Texas
Posts: 723
Garage
^^^^ No, a realist

__________________
Steve
1981 SC Steel Widebody, DP Lid, 930/51 to 3.2l, K27 7006 Turbo, DOD, P&P Twin Plug heads, Twinfire Ignition, Ruf Intercooler, Powerhaus headers, Zork, CIS Euro FD, 009 injectors, 044 pump, BLwur, 930 4 sp LSD, Mocal 44 w/fan, LM2, Brembo, Retroair, Euromeisters
2003 BMW Z4 Daily Driver & Autocross car.
Old 05-05-2018, 03:39 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #8 (permalink)
Reply

Thread Tools
Rate This Thread
Rate This Thread:

 


All times are GMT -8. The time now is 06:50 AM.


 
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.