blue temp sender what does it control

[richard s]

what does the blue temp sender control
as the other day i was driving along a dual carriageway at 70-80 and it seemed a bit flat when accelerating from these speeds also when going at constant speed the exhaust note seemed to dip every now and again as if slight misfire anyone know if this is down to temp sender
if not what else could this be cheers
(1990 8v gti 2.0 agg bottom end)

[petercrab]

I think it just controls the water temperature level on the dash and nothing else.

[Dougie_91 8v GTi]

Might be due to a hole in the exhaust, I've changed the middle two sections of mine when I bought it recently, but still have a slightly louder exhaust note (more bass/deeper), popping and slight drop/dip of the revs if you rev the engine before it settles at around 850rpm.  I will replace the rear section of the exhaust as I think this is the cause of most of the issues, and the slight flatness as you described.

Then after that I will check if I have; or will change to the 'blue' temperature sender as per the tuning guide on this site for the DIGIFANT engine. Then have the car checked over when the cambelt, fan belt etc and the clutch cable are replaced in the next week or so.  Quoted around £280-300 for all the work, plus the exhaust.

[takethefifth]

The blue temp sender gives the water temp to the ecu which it then uses to calculate richness of fuel mixture. The black one is the dash sender. If its knackered it can give all sorts of symptoms, bad starting, bad idling, boggy running to mention 3.