Am I being fobbed off????

[nelly1]

Took my Tuscan in for its 30k service t'other day (won't say where). On the way there, noticed the fans were not cutting in (in monstrous traffic, it has to be said) even when coolant temps were in the 100's

Never mind, thinks I, the place of service is the right way to be going.

The service seems to go ok, but the fan problem apparently requires a new coolant temp. sensor, which won't be available 'till next week sometime.

What puzzles me is......the temp. on the dash was reading ok, but the 'faulty' ECU sensor was only reading into the high 60's, then stopping, hence the fans not coming in

How many temp. sensors has the SP6 engine got then?
Surely there's only one sensor feeding the ECU, which in turn tells the dash what to display, along with all the other data?

I work with engine management systems day in, day out (albeit for a different company), but why would anyone go to the unnecessary expense, etc, of fitting two sensors to monitor the same thing?

If any light could be shed for me........

If there are two sensors, forgive my ignorance, but I've been 'delayed' by companies who are only too willing to 'push non-standard things to the back of the queue' too many times before!
Maybe they just haven't looked at the problem yet

Call me old fashioned, but once (or more!) bitten.....

>> Edited by nelly1 on Saturday 14th May 09:13

[Spud Gun]

There are two temp sensors fitted on the speed six engine, one for the dash and one for the ecu. Tvr tried to use just one but it just didn't work. The sensor that is used for the dash display is capable of picking up a pocket of steam passing it, hence the brief 120 degree warnings that sometimes pop up.

hope that makes you feel better

[nelly1]

Cheers for that.
Felt a bit embarassed having to ask, but I wasn't getting much joy asking the servicer ("we'll phone you back"........), and felt like I was just being delayed.

[Mr Freefall]

Also it could be an air lock, just happened to mine. I heard also that there is a wait for the sensors right now. I had to wait a week too.Id rather the car was off the road.

You can unplug the sensor at the back of the block (under the air filter) this will permantly put 1 fan on when the engine is running. Good little trick if the fans do not come on for some reason, as driving the car does not cool the engine down enough from 120c, and you will have to wait 2 hours for the engine to cool down from 120c to drive it. Must have some allen keys in your tool kit for this tho'

Mr F

[nelly1]

Thanks Mr F.
When (!) I get it back, I think I'll fit a little dash-mounted switch which disconnects that sensor and hence overrides the fan.
It's got to be better than watching the temp. rise and rise......

[basil brush]

It's not just a TVR thing. My old Porsche 944 had 2 coolant sensors.

[Spud Gun]

i've got a feeling that diconnecting the sensor will not only put on a fan, but may also put it into 'coldstart' mode and run too rich, it does on the cerb's

[nelly1]

Spud Gun said:

i've got a feeling that diconnecting the sensor will not only put on a fan, but may also put it into 'coldstart' mode and run too rich, it does on the cerb's

Interesting.....

I'll ask those (seemingly) in the know when (!) I get the car back.