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[Debs.]

Temp sensor behind bumper on the blink

  Erm......is not the intake-air temperature sensor located in the area around the MAF?.....I thought the under-bumper one was just for the display?.....I might be wrong, though.

Having recently suffered faulty crank-sensor woes, I also noted that the various symptoms (no/low/oddly-high/hunting idle) were considerably worse on cold mornings; might this perhaps, be warning of a failing crank sensor?

[feeutfo]

No indeed, engine temp is taken from the spade connector to brass coolant sensor on the coolant bridge under plenum. These can corrode /fall off.

But check for minor air leaks, such as loose icv to plenum, breather pipes ect.

[Kevin Wood]

Intake air temperature is indeed a separate sensor near the MAF on pre-DBW V6s. On DBW V6s, it's built into the MAF sensor itself.

[GaryBC]

The indicated outside temp display on the dash seems ok - does the engine management computer take a feed from there too?

Where is it? If it's easy to get at I can re-seat the connector.

No.

Not a lot of point fiddling with it then! But it begs the next (obvious?) question of, "so where does the engine controller get it's temp feeds from - specifically the engine temp (as opposed to ambient)?" The way I figure it it is this feed that is probably causing the problem as the high and erratic idle suggests it thinks it is still stone cold. (Although I know that nothing on a Miggy is ever as simple as that!!)

[GaryBC]

No indeed, engine temp is taken from the spade connector to brass coolant sensor on the coolant bridge under plenum. These can corrode /fall off.

But check for minor air leaks, such as loose icv to plenum, breather pipes ect.

The second point sounds like my best initial bet. If the connector came adrift the problem wouldn't have corrected itself. (Mind you - thinking about it - neither would an air leak spontaneously fix itself either!) Could a failed (or failing) temp sensor be the cause of my problem?

[Debs.]

I believe I remember seeing an engine fault code for 'coolant temperature voltage high/low'
Have you "paperclipped" for any codes?

http://www.omegaowners.com/forum/index.php?topic=90524.0

[05omegav6]

The indicated outside temp display on the dash seems ok - does the engine management computer take a feed from there too?

Where is it? If it's easy to get at I can re-seat the connector.

No.

New thing learnt