5 replies to this topic

[mykweb]

As the title says really

I had the common MPi running fan issue. This was solved by extanding the loom on the Plug and then fitting a new Temp sender. Sorted.

The other week there I fitted a Stage 3 head and my roller rockers. Fitted everything back up and started the car, and the fan started to run.

I have a spare temp sensor which I bought at the same time as my last one. So I fitted this one and connected the plug back up and started the car. The fan stayed off. All was fine untill around a week ago when the pesky fan stated coming on again.

Because its been bitter cold I have been running teh car with out the fuse and monitoring the temp gauge. so all is well

But wonder if anyone else keeps getting this issue. Surely the sensors can't just automatically go faulty on a regular basis.

I have checked all the wireing, and even stuck a volt meter on it to check for restance and also a battery on it to mreasure its getting a good signal from ECu to the plug end.

Also ran some electrical contact cleaner on both the ECU plug and the Temp sensor plug,

Anything else I can try before I buy another Temp sensor ?

Mike

[Sprocket]

Long shot

Replace the oil temp sensor. The Rover workshop manual does not show the oil temp sensor connected to the ECU, BUT, the MEMSJ2 ECU was originaly used on the Rover KV6 engine and had oil temp sensor wired to the ECU. The Rover workshop manual also mentions that if the oil temp is high the fan is activated. It mentions nothing of this on the Mini.

I have not had the chance to tear apart the MPi loom to find out if the oil temp sensor just feeds the oil temp gauge or whether it also feeds the ECU. I just do not know which is why I said it is a long shot,it might be an expensive long shot at that.

[mykweb]

cool man, I will give that a try. I know that my oil temp reads normal ish.

Starts off low on teh gauge and after driving for a bit it stablises out about 90.

But will try swapping and seeing if this helps.

Does the Rover Wiring diagram not show this by the way?

Mike

[mykweb]

Just checked the Mpi manual and the ECU does not have a feedback from the Oil Temp.

This does not mean that there is not one there. LOL as we all know rover are men of mystery .

Do you think the Inlet air temp might have anything to do with it. I am guessing no because it only really affects the fueling. ?

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Edited by mykweb, 24 December 2009 - 06:31 PM.

[nicksuth]

New Oil Temperature Sender is only around £20 delivered so probably worth a try?

Linky..

Just one question though, (if it is in the ECU circuit as the Rover KV6) - if you disconnect the Oil Temp Sensor with the ignition on and engine off should it not trigger the fan?

Edited by nicksuth, 27 December 2009 - 10:56 PM.

[mykweb]

New Oil Temperature Sender is only around £20 delivered so probably worth a try?

Linky...

Just one question though, (if it is in the ECU circuit as the Rover KV6) - if you disconnect the Oil Temp Sensor with the ignition on and engine off should it not trigger the fan?

YOu would think so. LOL

I decided to bare the cold yetserday and wrapped up in a few layers and went out to the garage to investigate.

I plugged in the ACR 4 reader and there was no faults found. I then tested the fan and all was ok.

Then started the car and the fan came on first time. I then removed the sensor plug and the sensor and cleaned the connections with some electrical cleaner spay, Refitted and then activated the alarm, deactivated and then started the car.... and now its running without the fan.

Done this a few times and the fan never cam on once... but it has done this before.

I let the car come up to temp and the fan activated then switched off. which is a good thing.

But still weird how it does this. I might try the oil temp sensor.

MIke