Oil and temp lamp lighting!

[borgeb]

Hi to all you R4 experts!
I have an issue with my R4 1108, both oil lamp and temp lamp is coming on after some km of drive, first blinking then solid.
Oil is on top, there is no sign of overheating.
No water dissapears, no majonnese on oil cap.
I have checked all electrical connections and wires from oil level sensor and temp sensor and cant find any errors, like earth failjure.

Come on guys, what could this be?
Car is behaving like normal, but it is stressful to have this light flashing..

 

[malcolm]

You can get the coolant light without overheating - it comes on first but only just.

Check the coolant wire isn't shorting on the exhaust manifold. That would turn the light on.

 

[jjad]

Does the light go off if you turn the cabin heating on?

Is the timing retarded?

 

[borgeb]

Does the light go off if you turn the cabin heating on?

Is the timing retarded?

Will check this!

 

[borgeb]

You can get the coolant light without overheating - it comes on first but only just.

Check the coolant wire isn't shorting on the exhaust manifold. That would turn the light on.

Cant find any shorting. And both oil and coolant light is coming on together.

 

[laxeian]

If you have checked under bonnet wiring and all ok and both lights are coming on together would indicate from a fault finding perspective it would be a fault where the wiring/lights would have common feeds, ignition switch, cluster, fuse box, where an intermittent positive short to shared feed is illuminating both lights faults, intermittent faults are not easy,be lucky!

 

[688D7/12]

Check oil pressure switch or cable connection. Oil pressure lamp switch on temperature lamp too!

 

[borgeb]

Check oil pressure switch or cable connection. Oil pressure lamp switch on temperature lamp too!

Is it really oil pressure switch? I thaught it was only oil level switch! Anyway, when I disconnect this cable both lights will go out.

 

[André4Renaults]

The two warning lights (temperature and oil pressure) are wired so that, in the event of the oil pressure dropping BOTH lights come on. This is why when the ignition's switched on, again BOTH lights illuminate. You can check they're working properly by disconnecting the feed to the oil pressure sender unit & confirming BOTH light are dull when the ignition's on but the engine's not running.

What oil is in the sump & when last was it changed? It ought to be a decent 20/40, 20/50 or 10/40 GTX Magnetec. If the oil's too thin it will result in a low pressure warning after a few miles, when the oil's warmed up.

 

[borgeb]

The two warning lights (temperature and oil pressure) are wired so that, in the event of the oil pressure dropping BOTH lights come on. This is why when the ignition's switched on, again BOTH lights illuminate. You can check they're working properly by disconnecting the feed to the oil pressure sender unit & confirming BOTH light are dull when the ignition's on but the engine's not running.

What oil is in the sump & when last was it changed? It ought to be a decent 20/40, 20/50 or 10/40 GTX Magnetec. If the oil's too thin it will result in a low pressure warning after a few miles, when the oil's warmed up.

Thanks! Will change oil!