engine oil warning and another couple of questions

[WBray]

Hey guys,
Another thread by me with some more questions sorry!

Since I've bought the car I have always had the engine oil pressure showing high (5) all the time and intermittently had the engine oil warning light come on. I and like most people on here thought it was something to do with the oil pressure sender being knackered, I got around to changing it today, the old one was shagged but since changing it the oil warning light is still on and the pressure hasn't dropped. The car drives perfect so can't be the pressure causing it myself, my dad (who's and aircraft engineer) and his mate who done the work (who's both and aircraft engineer and a mechanic).
Could this be a fault in a relay somewhere in the system causing it to show the incorrect pressure and putting the warning light on?

Does anyone know what this is as noticed this today and never really noticed it before?

Annoyingly aswell I went to change the water temp sensor as that permanently shows the water is top end of the gauge but been sent a completely different part so couldn't change it but should be getting it replaced next week

 

[edh]

try swapping the 2 wires on the sender..

 

[WBray]

ORIGINAL: edh

try swapping the 2 wires on the sender..

Though the indication is always high, surely the warning light would be permanently on or off rather than intermittent? Or are we over thinking that?

 

[Eldavo]

Looks to me like some kind of lizard, possibly a salamander.

 

[944 man]

[]

 

[WBray]

ORIGINAL: edh

try swapping the 2 wires on the sender..

Been told this on another forum so going to give it ago, two people cant be wrong surely, hopefully?

ORIGINAL: Eldavo

Looks to me like some kind of lizard, possibly a salamander.

Lmao tit []

 

[944Turbo]

that looks like a turbo water pump sensor switch, oh and that is the rudimentary diagnostic plug you can make an LED flash codes

 

[edh]

it's the diag port. use to centre the isv on a turbo to set idle speed. no idea what else it will do

 

[944Turbo]

see here http://www.the944.com/idle86.htm cant find the article on led codes, seen one somewhere I think it is very basic though!

 

[944Turbo]

http://www.lindseyracing.com/mm5/merchant.mvc?Screen=CTGY&Store_Code=LR&Category_Code=BLINKCODE


except that is for a turbo so no use to you at all!

 

[BlackMagic]

Are you sure that it is the oil pressure switch that is tripping the light and not the oil level switch (in the sump). The oil level switches are notoriusly sensitive, often tripping when the sump is half full but the car is on a slope.

William

 

[robwright]

You have been sent the right part. The 944 has 2 x water temp senders both located next to each other on the cylinder head area. The blue top one is for the DME and controls mixture while the one with spade connectors on the top controls the dash gauge.

 

[bmnelsc]

IRRC the way the oil pressure light works is that when oil pressure drops below threshold the sensor creates the ground for the circuit and light comes on. You say intermittent - so I'd be looking at the wiring from the sensor - perhaps you are chaffed through somewhere allowing the circuit to ground and causing the light to come on.

 

[WBray]

Lol always useful having a plug for something you don't have fitted to the car.

I was pretty sure it was the pressure switch tripping especially as when we removed the previous one the internals were loose and it had some bodged connections on it, I think someone has attempted to sort the problem in the past and given up. Going to try switching the terminals around soon and see if that solves anything, if not then will have to see if I can get the wire checked for chaffing.
Is there any way in the mean time to check to see whether the oil pressure is low?

shouldn't be anything to do with the sump putting the oil light on as the oil level is good and it came on sporadically whether it was flat in my garage or, the slope of my drive or being driven :/


Rob the small fat one I have removed there, which one is that meant to be then mate? As i could only find that 944's had one temp sensor and when on the phone ordering the bit they said there was two different one but weren't sure if they were different between 2.5's and 2.7's. Since giving that small fat one a clean with a wire brush it seems to behave a little better on the gauge though desperately needs replacing as its corroded.

Going to be doing a 24k service at the end of the week as well and an engine flush so hopefully that might help.

Thanks for all you help guys really do appreciate it [] just hope I can get rid of these warning lights soon.

 

[944Turbo]

ORIGINAL: robwright

You have been sent the right part. The 944 has 2 x water temp senders both located next to each other on the cylinder head area. The blue top one is for the DME and controls mixture while the one with spade connectors on the top controls the dash gauge.

yes now you have pointed that out I realised the turbo pump switch has a single connection on top
Tony

 

[ChasR]

Regarding your temp gauge shooting to the top, on both of my 944s it would down to dirty gauge contacts. Cleaning them gave me a stable temperature reading.

 

[WBray]

ORIGINAL: ChasR

Regarding your temp gauge shooting to the top, on both of my 944s it would down to dirty gauge contacts. Cleaning them gave me a stable temperature reading.

This seems to be the sensor itself, removed it and there is some corrosion around the bottom ofthe thread and after a scrub with a wire brush it behaves a little more, but still shoots to the top eventually. Shall give everything a clean though to prevent anything like that happening later on

 

[ChasR]

Next time it hits the top, try knocking the gauge with the knuckle of your finger a few times (I am not kidding) That should rule out the gauge (in many a case the gauge will begin to behave itself).

 

[T3rra]

Normally the wires can't be put on the wrong way. One connection is bigger then the other. Could be touching ?

So what reading do u get with the dash lights on but the engine off?
What reading do u get with the engine running?

What oil type do u have? Weight will change the oil pressure silghtly.

What's the longest drive u been on? Dose the oil pressure drop then increase with the revs?

Where did u get the new sender from? I had a new sender play about, think it was from euro car parts or gsf and had one 4 Porsche shop which was 3 x price and lugs snapped putting the nut on by hand!

Iv got a newish/ used rad temp swicth on a rad Iv just removed from my S

 

[WBray]

ORIGINAL: T3rra

Normally the wires can't be put on the wrong way. One connection is bigger then the other. Could be touching ?

So what reading do u get with the dash lights on but the engine off?
What reading do u get with the engine running?

What oil type do u have? Weight will change the oil pressure silghtly.

What's the longest drive u been on? Dose the oil pressure drop then increase with the revs?

Where did u get the new sender from? I had a new sender play about, think it was from euro car parts or gsf and had one 4 Porsche shop which was 3 x price and lugs snapped putting the nut on by hand!

Iv got a newish/ used rad temp swicth on a rad Iv just removed from my S

The wires were bodged on as think someone has gone to change the part before and not bothered in the end, so they could be the wrong way around unfortunately :/

Not sure without checking the pressure without the engine on.
When running its permanently up on 5.

Not sure on the oil in it was only meant to have had a change in november but has had decent stuff put in, I have been given what didn't go in but again without checking I cant remember. Though I am going to do a engine flush, oil and filter change next/this week hopefully as part of a 24k service.

Longest drives have been driving it from Maidenhead where I bought it to west Cornwall and West Cornwall to Bristol and back. Stayed at its permanent 5 position (though did briefly drop to 4 for a couple of mins).

Got the sender for Jasmine Porschalink.