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[Julian James]

Hi

MOT booked today, and still overfuelling I think.  So (after ripping off air intake, plenum, breathers, cleaning MAF etc the other day)  I think it may be the Coolant Temperature Sensor.  i.e. it's running rich because it thinks it's always cold...?  After reading posts and thinking back, it sometimes doesn't start straight up again when hot after long drive (which confirms this for me)

I read on here that there are actually 2 sensors for the 2.0 - one for ECU, one for temp guage on dash. Is this the same on the V6?

I also had a wierd thing going on with my guage...  Sometimes the light would be on, and the temp would flick around, eg from bottom to top!!  then come down again after 2 seconds.
I have recently changed coolant.
It hasn't done this yesterday or the day before.
Could it be poop in coolant that didn't get flushed properly that is cycling round and giving dodgey reading when stuck?  Or more simply a broken sensor?
(If of course there are indeed 2 seperate sensors on the 2.5 L)

Thanks in advance.  Looking to get it sorted as soon as poss today and then put it in for MOT later.  (At least I would then have ruled out some stuff before the emissions test)

Thanks all

[Andy B]

....
I read on here that there are actually 2 sensors for the 2.0 - one for ECU, one for temp guage on dash. Is this the same on the V6?

 ......

Yes. The sensor for the gauge has just one connector (similar to a drawing pin head) and the other for the ECU has a proper 2 wire plug to it. To test the gauge, ground/earth the wire (blue IIRC) & your gauge should read HOT. 

[Julian James]

thanks andy.

I assume this is also located in the same place?  (I spied the ECU sensor the other day I think when intake bridge was off.)

[Andy B]

thanks andy.

I assume this is also located in the same place?  (I spied the ECU sensor the other day I think when intake bridge was off.)

That's right, they're next to each other on the coolant bridge. 

[Julian James]

Thanks again mate.

Had a quick look.  Found the guage sensor was disconnected and lying on the coolant bridge.  If bypassed gives a hot reading, then I guess it was shorting out intermittently and hence going up and down.  Managed to squeeze my hand down there and put it back.
Read fine on ignition, will see how it goes when car warms up on way to motor factors and test the sensor when I have the plenum off the replace the ECU sensor! 

Legend