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[Marks DTM Calib]

It could just be the oil pressure switch being faulty so Kevin's suggestion of plumbing in a gauge seems a good one

Low probability but, hope springs eternal!

But yes, a gauge would be a wide move

[Martin_1962]

...
Ah, is this a "no sump" engine?

It has a sump, just no sump drain plug. 

You turn the car upside down to drain the oil out

[Andy B]

Sounds like it may need shorter change intervals.

I guess also that its an oil suck setup which tend to resul in sludge in the sump more (sadly).

I dont like the sound of the flickering lamp, they normaly come on at the 12-15psi mark where as the oil pressure even when hot should be 30+.

Removal of the sump was one of the first things done when the light started flickering, and the sump itself was clear of all sludge.
(just loads of condensation/mayo on the walls)
Only problem was something like Hermatite blue had been put on with a shovel and the excess inside the sump had fallen down & been picked up by the pump.

Removing this lot made a huge difference - the cam chain has a hydraulic tensioner so even though it's still a bit noisy - it's loads better that it was.

[Andy B]

It could just be the oil pressure switch being faulty ....

New switch fitted ....... which COULD still be faulty  :-/

[Andy B]

...
Ah, is this a "no sump" engine?

It has a sump, just no sump drain plug. 

You turn the car upside down to drain the oil out

Tried that, but lost the washer water too! 

[Kevin Wood]

If this has happened before then clearly the oil pressure is marginal. If the switch has been changed it's unlikely to be that. :-/

I think I'd be looking to check the pressure relief valve next. If it's had all that sealant in the pickup it's not unlikely that some has ended up jammed in the relief valve.

[Andy B]

If this has happened before then clearly the oil pressure is marginal. If the switch has been changed it's unlikely to be that. :-/

I think I'd be looking to check the pressure relief valve next. If it's had all that sealant in the pickup it's not unlikely that some has ended up jammed in the relief valve.

Good idea. 

[aaronjb]

It could just be the oil pressure switch being faulty ....

New switch fitted ....... which COULD still be faulty  :-/

Do you know what pressure the switch activates at? On the MR2 it comes on at 3.8psi, which is frighteningly low (as many people say on that forum, it's really not an oil pressure warning lamp, it's a "Please visit the dealer for a new engine" lamp!) - I'd be worried if it was flickering and that's it's activation point.. if it were higher (say, 10psi or so) I might not worry so much.

[Marks DTM Calib]

Sounds like you have a few thinsg to check then Andy.

Given the pics you posted, I would not be overly surprised if some bearing wear had occured and hence the oil pressure issues.

[Andy B]

...
Do you know what pressure the switch activates at? ....

No. I'll see if I can find out. 

[Andy B]

...

Given the pics you posted, I would not be overly surprised if some bearing wear had occured and hence the oil pressure issues.

Mmmm  That's what I'm frightened of. 

Goes to show how much better a well serviced car is compared with one that isn't. 

Maybe an oil change with hypoid 90 & sell the bugger 

[Kevin Wood]

...
Do you know what pressure the switch activates at? ....

No. I'll see if I can find out. 

If this one is OEM spec. it suggests not a lot.  :-/

http://seekpart24.com/hella/oil-pressure-switch-6zl008280061?c=100478&at=13106

Switch Pressure [bar]: 0,15-0,35

[henryd]

Autodata suggests that oil pressure should be 2.0-2.5 bar at 750-950 rpm

HTH

[Marks DTM Calib]

...
Do you know what pressure the switch activates at? ....

No. I'll see if I can find out. 

If this one is OEM spec. it suggests not a lot.  :-/

http://seekpart24.com/hella/oil-pressure-switch-6zl008280061?c=100478&at=13106

Switch Pressure [bar]: 0,15-0,35

Kin ell, thats bugger all of bugger all!

I thought the Vx one was low at 0.5 Bar

[aaronjb]

...
Do you know what pressure the switch activates at? ....

No. I'll see if I can find out. 

If this one is OEM spec. it suggests not a lot.  :-/

http://seekpart24.com/hella/oil-pressure-switch-6zl008280061?c=100478&at=13106

Switch Pressure [bar]: 0,15-0,35

Kin ell, thats bugger all of bugger all!

I thought the Vx one was low at 0.5 Bar

Yeah, much like the Toyota one it's not a "warning: there's something amiss" light it's now a "congratulations, you're boned!" light  :-/

Granted if it's only flickering at idle it's probably not doing too much damage - as long as the pressure is healthy off idle. But what cars come fitted with oil pressure gauges these days?