GTD blue temp sensor

[LoneWolf]

My dash light keeps flashing up and ive tracked it to the blue temp sensor, but what i want to know, is what does it actually do? and would it have any effect on the fuel consumption, or am i just being paranoid?

 Cheers,
             Matt

[MikkiJayne]

The blue temp sensor is the one for the engine management although how much management you'd have on a GTD I'm not sure? Maybe something electronic to help cold starts?

It will affect fuel consumption because whatever it is that wants to know the engine temperature will default to thinking it's cold and put more fuel in to compensate.

The blue temp sender is the single most unreliable automotive component that VW have ever invented (and yes I'm including Corrado electrics in that statement!). They are cheap and easily replaced  

Mikki x

[rubadubdub]

Am i missing something as i didnt think GTDs had a blue temp sender? Arent they on petrol (gas) engines supplying temp to the ECU, which GTDs dont have? on petrol cars it will definately have an effect as disconnected or faulty it sends the car into limp home mode and makes it run really badly, as i found with my old polo.

So far as i know the only senders are two black ones for temp guage and glow plugs. Theres a low coolant temp sensor in the expansion bottle which will flash if it goes dry so maybe look there.

[LoneWolf]

Im just guessing its a temp sensor, and its blue.  ive had a couple goi on my polo GT and my old golf, so i know how easy they are to replace, but my fuel consumption has gone through the roof :?   could this be due to a sensor somewhere?
 
 i know the GTD doesnt have an ECU, but surely theres a reason its gone like this?

[Vincent Waldon]

I guess the question is:  which dash light is flashing ??

On the earlier cars (pre-1990) at least in North America the temp senders tended to be solid brass... however, the oil pressure sensor was blue.

Is it your oil pressure light that's flashing ??  Was the sensor on the side of the head all by itself ?  The coolant temp senders are almost always part of a coolant flange.

Neither one is likely to cause a dramatic drop in fuel consumption (unless you really do have low oil pressure  :shock: )... many other factors:  sudden shift in timing if the belt jumps, dragging emergency brake, underinflated tires, and the most common:  a fuel leak at the IP pump you haven't noticed yet.

[LoneWolf]

the sensor book in work says its something to do with the inlet heater?

[rubadubdub]

did you get anywhere with this?