 how to tell if the oil pressure switch is bad on a 3.2, I have check continuity of the wiring harness but no light |
|
|
|
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG.
This site is not affiliated with Porsche in any way. Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners. |
|
|
  |
| buck toenges |
 Feb 26 2020, 02:55 PM
Post
#1
|
|
Senior Member  Group: Members Posts: 553 Joined: 25-November 03 From: Fort wayne In Member No.: 1,388 Region Association: None 
 |
I think my oil pressure switch on my 3.2 that is located on the top back of engine next to the tranny is bad.
So I am finally hooking up the wiring to my 4 gauge cluster gauge. I have the oil pressure gauge, oil temp gauge, fuel tank, and voltmeter working. The only problem now is the oil pressure switch "idiot" light not working. When I check the continuity of the green/red stripe wire from the 914 harness to the 1988 911 engine harness it checks out great. When I pull the wire off the oil pressure switch on the top of the 911 engine and ground it, and turn on the ignition the oil light lights right up on the gauge cluster and then goes off when I remove the ground. When I plug the wire onto the oil pressure switch and turn on the ignition and start the car the light doesn't light up at all. How can you tell if the oil pressure switch is bad? Thanks, Buck |
   |
 
|
| jcd914 |
Feb 26 2020, 04:43 PM
Post
#2
|
|
Advanced Member Group: Members Posts: 2,081 Joined: 7-February 08 From: Sacramento, CA Member No.: 8,684 Region Association: Northern California |
The oil pressure switch is a "normally closed" switch, meaning with engine off the oil pressure switch should connect directly to ground.
If you hook an ohm meter to the terminal on the switch and test the circuit to ground (engine case) you should get zero ohms or very close to zero. When the engine is running and has oil pressure ( >7psi?) the switch will be open and no longer connect to ground. Jim |
|
|
|
| GregAmy |
Feb 26 2020, 09:33 PM
Post
#3
|
|
Advanced Member Group: Members Posts: 2,290 Joined: 22-February 13 From: Middletown CT Member No.: 15,565 Region Association: North East States
|
Turn the key on and pull off the wire and touch it to the block. The light should come on.
If it turns on that way then you have a bad switch. Edit: or maybe you've used so much Teflon tape on the threads that the switch can't ground? Is your idiot light wire attached to a VDO combo pressure gauge/idiot light sender? Is that sender properly grounded? |
|
|
|
|
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:
|
Lo-Fi Version | Time is now: 9th May 2024 - 09:45 AM |
Invision Power Board
v9.1.4 © 2024 IPS, Inc.