2.1 stock engine high pressure switch

[maco70]

Hello everyone,
For several years, the switch wire to the high oil pressure on my 2.1 engine was connected directly to the ground, because the buzzer and light would activate when the warm engine's revolutions dropped below 2200 rpm.

A mechanic with some initiative recently reconnected the switch (and replaced it with a new one).
Another mechanic, this one a reputable one, confirmed that the cylinder compression and engine oil pressure are fine.
However, the reconnected high oil pressure switch is causing problems, because the oil light and buzzer frequently activate when the engine is warm, typically when exiting the highway and I want to lower the revs. Below 2200 rpm, the buzzer and light activate.
I have to shift into neutral and blip the accelerator to stop the activation of the light and buzzer. I have good reason to believe that the low-pressure switch is OK.
I'm aware that my engine may be nearing the end of its life, even though I maintain it very well.
Would it be appropriate to disconnect the wire connecting the switch (brown wire in the photo, originally yellow) and ground it to eliminate the activation of the light and buzzer at highway exits (when the oil and engine are hot)?

I could ground the wire at the distributor base :

Martin
_________________
Martin from Montréal

1986 Vanagon GL full camper westfalia
(brown/tan interior)

[MarkWard]

Did they note the pressure spec of the switch? It’s usually engraved into the switch. There is a lower pressure switch that is recommended. I don’t recall the pressure differences in switches.

[maco70]

Do you mean the one at the left front of the engine, close to the thermostat, or an another high pressure switch?
_________________
Martin from Montréal

1986 Vanagon GL full camper westfalia
(brown/tan interior)

[dhaavers]

[RawUmber]

[hardway]

The correct high pressure oil switch is 068 919 081A or C. The plastic is grey. The calibration is .75-1.05 Bar. This is engraved on the switch. The switch in your photo is grey.

In my experience measuring the oil pressure without a long test drive is of limited value. On one of my own fleet the buzzer went off a lot. My wife drives that one. I had to permanently install an accurate dash mounted oil pressure gauge to prove that the buzzer was accurate.

If the buzzer is accurate then the oil pressure is not fine. Defeating the warning system is not a solution. I have seen a lot of vans with that wire grounded.

[Wildthings]

If a previous owner had grounded the wire to the high pressure switch out, then that indicates that the problem may have been there for a long time by now. I know that the electronics for the high pressure warning light can and do go bad, but lack knowledge on troubleshooting them.

I would probably start with trying another switch, maybe one from the dealer. The original switch is a normally open switch that closes at a nominal 13 psi (0.9 bar), with an acceptable range of 11-15 PSI (0.75-1.05 bar)