'Orrible smell from my B3 90 20v.

[SwallownAmazon]

Just back from a very enjoyable "no pressure" trip around the countryside of the Pas de Calais which we normally only see from the rally car while competing.

The old girl performed faultlessly apart from one thing and that was the smell from the exhaust. It smells as though it is running rich although overall fuel consumption just trundling around was 35 mpg, perhaps a little bit higher than I might have expected but not bad for a 2309 engine. Several of our fellow travellers on the holiday commented about the fumes after following us and it was noticeable that some tried to get by or just dropped back.

I have noticed that the temperature gauge rarely goes above the division between 50 and 90 degrees even though the temperature at the top of the rad when the engine is hot is around 86 degrees. This was measured with an accurate temperature probe I used to use for work measuring the temperatures of paper mill drying cylinders.

A couple of things come to mind but I would seek advice as I am a bit of a bear of simple brain in such matters:

• Does the same sensor operate the water temperature gauge and send signals to the ECU or are there two? If it is the same sensor could a low "reading" cause the ECU to call for more fuel? Are these sensors still available?
• Could a faulty lambda probe cause over-fueling?

Injection system is the Hitachi version if that makes any difference.