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[lesask]

my mech changed what i believed to be the temp gauge, the gauge still does not work, 2.6 v6 engine. he did not take off the plenum but instead went deep behind the engine block and gained purchase in this area by removing the washer wiper motor and a few other bits, he did change something, perhaps he changed the wrong sensor or is there 2 because a very clever chap on this says the sensor lives between the v under the plenum thing and showed my a picture?, i really dont know whats been changed. anyway got a new mot on it today but with some advises but thats ok. i really must sort this temp gauge now. thanks all.

[Marks DTM Calib]

There are two temp sensors, one is a two pin device which provides a signal to the ECU and the other a single wire device for the temp gauge.

Its rare for the sensor to fail, usual cause is the wire coming off, does the temp gauge rise when stationary?

[lesask]

sir, no, totally dead, i wonder if he has changed the sensor that feeds the brains box, it did look like a 2 pin thing, he did not take the top bit off the engine, i might take this plenum off and have a look myself, my mech went deep behind the engine block, the gauge did work fine, took a drive out and when i next looked totally zero and nothing since, i bet he accidentally changed the wrong sensor, im worried to take off this plenum, any guide lines for me to follow or just unbolt and unclip  everything i see. thanks

[tunnie]

sir, no, totally dead, i wonder if he has changed the sensor that feeds the brains box, it did look like a 2 pin thing, he did not take the top bit off the engine, i might take this plenum off and have a look myself, my mech went deep behind the engine block, the gauge did work fine, took a drive out and when i next looked totally zero and nothing since, i bet he accidentally changed the wrong sensor, im worried to take off this plenum, any guide lines for me to follow or just unbolt and unclip  everything i see. thanks

Sounds like that little brass connector has fallen off the sensor feed, which as posted before lives on top of the coolant bridge 

[lesask]

ok and this bridge lives under the plenum, if easyish to remove i take it that it be quite clear what to change, will the car shop know what this brass thing is, do you think

[RobG]

ok and this bridge lives under the plenum, if easyish to remove i take it that it be quite clear what to change, will the car shop know what this brass thing is, do you think

Odds on that the connector has come adrift probably caused by a ham-fisted "mechanic"

[tigers_gonads]

Anybody in london that can have a look here ?

[tunnie]

Anybody in london that can have a look here ?

I would, but have zero tools. All back in Northamptonshire 

[tunnie]

ok and this bridge lives under the plenum, if easyish to remove i take it that it be quite clear what to change, will the car shop know what this brass thing is, do you think

Don't take it back to the bloody idiot mechanic you did before 

[lesask]

lol, thanks for your advice. ive checked out how to take the plenum off, basically i dont trust myself but i reckon the people on here are right and that i need the sensor changed on the bridge, i think he changed the ecu feed sensor, well at least thats done, lol. but actually my man is a good mech in general, i bet he has made a mistake. these things happen.

[RobG]

lol, thanks for your advice. ive checked out how to take the plenum off, basically i dont trust myself but i reckon the people on here are right and that i need the sensor changed on the bridge, i think he changed the ecu feed sensor, well at least thats done, lol. but actually my man is a good mech in general, i bet he has made a mistake. these things happen.

Might just be the connector come adrift

[tunnie]

lol, thanks for your advice. ive checked out how to take the plenum off, basically i dont trust myself but i reckon the people on here are right and that i need the sensor changed on the bridge, i think he changed the ecu feed sensor, well at least thats done, lol. but actually my man is a good mech in general, i bet he has made a mistake. these things happen.

Its just the dash (the brass one) to be honest, if he did not remove the plenum I highly doubt he replaced anything.

You probably don't need sensor replacing, just small spade connector being plugged back on. As it worked, then stopped. Indicted its all fine, it just slipped off 

[Murph]

My money is on a loose wire - just as has been said.

What area of london are you in?

[albitz]

After removing the plenum and inlet manifold you will see something very similar to this



The coolant bridge is at the rear of the engine (near the top of this pic. and the sensor for the gauge is the little brass part in the middle of the bridge,between the two large bolts which bolt the bridge to the heads. Sounds like your mechanic has replaced the one which sends info to the ECU (as already mentioned) which is the one at the rear of the coolant bridge to the right of the gauge sensor.Connector just slides back onto the top of the sensor.
Hope that helps.

[RobG]

Pretty much the same as this one then Albs Keep up
http://www.omegaowners.com/forum/index.php?topic=107373.0