Oil Pressure Light Won't give up...

[78BayDriver]

Ok, so I have alot of threads on here, and this is kind of odd. The Van is cold(motor), and no pressure light, van warms up, pressure light comes on... running 20w50 in the van. Light does not blink, it spazez out. Do I:

A: Go higher in weight oil?
B: Change oil pressure sender to new one of diff value?
C: Ignore the idiot light and pray my engine doesn't blow up?
She runs fine, no issues with power after warming up, just kinda bothers me. PO said that the light always blinked when he had it.

Michael
_________________
1987 Vanagon GL 2.1 Flat Stanley (present)
1991 Golf GTi Forest Green
1981 Vanagon L 1.6 Diesel
1978 BayWindow Bus
1974 Bus
1990 Jetta
1979 Dasher Wagon
1972 Beetle

[Bassyaks]

Mike, First don't run it any more than you have too until you figure out what's going on.

Check oil level
disconnect the lead to the Oil Pressure Sensor and run it around the block ( looking for grounding of lead) if not light
Replace the OPS
if it still lights up, you have no oil pressure. don't run it.
Possible worn oil pump
What's happening as the oil warms the viscosity lowers and the motor tolerances increase (main Bearings) and basically there is no restriction to raise the oil pressure.
Then the Motor Blows UP.

Good luck

[simd0ggie]

Get a gauge, or buy the gauge kit from Van-cafe. That will give you a heck of a lot more information to go on.

You have two OP switches, both can be disconnected and a jumper wire to ground used to test the functionality of the rest of the circuit. One of them is normally closed, the other normally open. Tencent has a great post on this.

http://www.thesamba.com/vw/forum/viewtopic.php?t=251094&postdays=0&postorder=asc&start=0

Scroll down and look for the long post by Tencentlife, after that you'll know as much as any VW engineer about how the dynamic OP system works and how to test it.
_________________
-Matt
'85 Westfalia w/EJ25, '14 Tiguan R-Line 4 Motion

"There are two possible outcomes: if the result confirms the hypothesis, then you've made a measurement. If the result is contrary to the hypothesis, then you've made a discovery.”

[78BayDriver]

Ok...so where is the high switch? I know where the low switch is...I think I solved my probllem... the high wire is not connected...


Michael
_________________
1987 Vanagon GL 2.1 Flat Stanley (present)
1991 Golf GTi Forest Green
1981 Vanagon L 1.6 Diesel
1978 BayWindow Bus
1974 Bus
1990 Jetta
1979 Dasher Wagon
1972 Beetle

[Orbitald]

"Some people have reported that Fram and other non-VW oil filters cause higher pressure drops because of restrictive flow. Try a VW "Autobahn" oil filter. "
http://www.vanagon.com/info/articles/oil-pressure-probs/index.htm

"The simple solution to this problem is to use Mann, Mahle or Autobahn brand oil filters."
http://www.van-cafe.com/home/van/page_15_9/oil_pressure_problems.html

Year ago I had the same problem and installing a quality filter fixed it.
_________________
'87 Syncro Westfakia, 1.9TD ADE (AAZish), 068 Injection Pump, K03 turbo, 2.5" exhaust, Mercedes nozzles, SAAB Blackstone charge-cooler w/ 800cfm fan, Micro-1000 EGT sensor pre-turbo, boost at about 13psi, 235/70/16 with stock gearing

[simd0ggie]

One switch under the water pump pulley (grey), and one between the pushrod tubes on the drivers side (brown). You'll have to take off the sheet metal shield under the pushrod tubes to get at that one. Here's the wiring until you get yourself a Bentley manual

_________________
-Matt
'85 Westfalia w/EJ25, '14 Tiguan R-Line 4 Motion

"There are two possible outcomes: if the result confirms the hypothesis, then you've made a measurement. If the result is contrary to the hypothesis, then you've made a discovery.”

[78BayDriver]

Ok read farther down that thread.. Found my HP switch, adn it works great... But now, after running it, the LP switch is making my light blink.... Go figure, maybe replace it and see where that takes me...

Thanks for the pic. It helps.. Got to love Volkswagon wire diagrams
_________________
1987 Vanagon GL 2.1 Flat Stanley (present)
1991 Golf GTi Forest Green
1981 Vanagon L 1.6 Diesel
1978 BayWindow Bus
1974 Bus
1990 Jetta
1979 Dasher Wagon
1972 Beetle

[dhaavers]

While you're down under looking at your LP sender, plug in a pressure tester ($10 - Harbor Freight) and get a real number after the engine's HOT.
Don't spend all your time trying to turn off the light saying you have low OP...because YOU MAY HAVE LOW OP.

What's your mileage? Another link for you & the rest of world:
http://volksweb.relitech.com/21rodbrg.htm

Upshot: HOT OP @ idle should be above 4psi or your engine is not long for this world.
Check your number & do something before you blow up another 2.1 PLUS lose almost $1000: what your engine core WAS worth.

Good luck...
_________________
86 White Wolfsburg Westy Weekender
"The WonderVan"
<EDITED TO PROTECT INNOCENT PIXELS>

[bassgruvn]

[tencentlife]

Do you have the part number of the Fram you used?
_________________
Shop for unique Vanagon accessories at the Vanistan shop:
https://intrepidoverland.com/vanistan/

Please don't PM here, I will not reply.

Experience is kryptonite to doctrine.

[78BayDriver]

I am using the bosch replacement filter from Autozone. That a good filter?
_________________
1987 Vanagon GL 2.1 Flat Stanley (present)
1991 Golf GTi Forest Green
1981 Vanagon L 1.6 Diesel
1978 BayWindow Bus
1974 Bus
1990 Jetta
1979 Dasher Wagon
1972 Beetle