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[luv_my_mv6]

hi all, was very bored so decided to have a flick through the plenum removal post in the maintanance section, and got the urge to take mine off and clean the breathers, luckily, the cops have done a great job and they were all spotless and clear, even the butterflies still looked shiney, then rummaged around the back and found my temp sensor for the dash board (still connected) but obviously not working, would this cause any engine issues other than not telling me how hot the engine is, I checked the rad hoses, and one side stayed cold until the engine got quite warm, so thermostat seems to stay shut till its hot. Remarkably easy to remove the plenum - only thing I couldnt do was get the throttle cable off the ball joint thing, I seem to have a different set-up to the one in the guide - thankfully though, as the breathers were clear I just turned the plenum over  

[STMO123]

I stand to be corrected here, but wouldn't the ECU get the engine temp, which it uses to control various functions, from the sender? :-/

[Kevin Wood]

ECU has a separate sender next to the gauge one. Gause sender has a single wire, the ECU one has 2.

Kevin

[STMO123]

ECU has a separate sender next to the gauge one. Gause sender has a single wire, the ECU one has 2.

Kevin

There you go, I stand corrected

[luv_my_mv6]

Yep, I have one single wire that connected to a typical looking temp sender, then a green multi plug in a sender just to the right of it, everything seems ok temp wise, except I dont see it on my dash   sometimes if its really hot under there, like after being stuck in traffic it goes up a little bit, but when I start driving again, it drops back down to the minimum, I think im correct to blame the single temp sensor and not the thermostat, fans seem to work ok too, they come on slow as you'd expect, cant say i've heard em going fast yet though.

[luv_my_mv6]

BTW - off topic, but noticed you live in Wakey STMO123 - My parents live there, as I did till I moved to the big stink   I do miss it up there  

[Kevin Wood]

Interesting that the gauge does move when the engine gets hot. Could be a lazy gauge or it could indeed be overcooling. What does the gauge read when the fans cut in?

If it's mid to high '90's I'd say the gauge is behaving and you may have a thermostat issue, although I'd expect it to be flowing during warm-up then.

Kevin

[luv_my_mv6]

the needle is at the lowest point (on the pin) pretty much all of the time, the fans come on regardles of the dash guage and only for a min or 2 when i'd expect the engine to be baking, I was sat in a traffic jam for a good 3 or 4 hours a couple of Sundays ago down at brighton, and fans came on consistantly for a few mins every now and again, guage crept upto about 85 (min is 80 on mine) but the engine was in reallity closer to the top 90's. Suppose its not gonna do any harm to swap the sensor for a new one, it looks easy enough to get out and pop a new one in.
 When you say overcooling, could that be caused by this contraption that the plod have installed, like an extra water pump jollopy, been told alot of ex plods have this in and that its fairly easy to take out and blank up?

[luv_my_mv6]

Interesting that the gauge does move when the engine gets hot. Could be a lazy gauge or it could indeed be overcooling. What does the gauge read when the fans cut in?

If it's mid to high '90's I'd say the gauge is behaving and you may have a thermostat issue, although I'd expect it to be flowing during warm-up then.

Kevin

 Just out of interest, can a lazy guage be fixed?

[STMO123]

BTW - off topic, but noticed you live in Wakey STMO123 - My parents live there, as I did till I moved to the big stink   I do miss it up there  

I live in Kettlethorpe, anywhere near?

[luv_my_mv6]

BTW - off topic, but noticed you live in Wakey STMO123 - My parents live there, as I did till I moved to the big stink   I do miss it up there  

I live in Kettlethorpe, anywhere near?

My mum comes from Hall Green originally, but they live in Lupset now (chav land) your out in the good bit of Wakey, lovely country out there  

[Kevin Wood]

the needle is at the lowest point (on the pin) pretty much all of the time...

OK. Sounds like the gauge then. My reasoning is that there are 3 devices sensitive to temperature - the thermostat, the gauge and the fan switches. It's unlikely that more than one of them is bad, so if the car is normally indicating cool it COULD be the thermostat. However, in traffic the thermostat is out of the equation and the temperature is controlled by the fan switches. If the thermostat was bad and the gauge good, I would expect the gauge to be reading certainly above centre with the fans running.

It's worth a try to change the sender. Likelihood is, it's either that or the dash assuming the connections are sound.

Kevin

[luv_my_mv6]

Cheers Kevin, gonna go and take my dash out and have a poke around the back, if that fails to fix it, i've got the sender to pick up tomorrow, so i'll let you know what it was - or wasnt  

[Marks DTM Calib]

The ideal would be to have the engine temp read via the ECU and the dash using tech 2....

[luv_my_mv6]

All fixed, removed dashboard and everything seemed to be well, whipped my plenum off again, swapped the temp sender for a new one (my god was the old one stuck in) and everything is good, temp now reading just over 90 degrees after a normal drive  
 Well chuffed, thanks everyone