Too much fuel consumption

[bxdimitris]

Good evening and greetings from Thessaloniki Greece, i own a BX 1.4 i kat KDY engine and i need daily 10 Euros unleaded for 60 kilometers, the price of unleaded is 1.50 Euros/liter. I already changed the fuel pipes the Monopoint, the main body of distributor, the Lamda sensor but again too much fuel.
What is the solution????

[Kaapelimies]

so where do you drive (city, highway, mountains) and how many liters/100km?

[jamescarruthers]

Unfortunately, we didn't get the monopoint fuel injection 1.4 in the UK so you're chances of getting help are, unfortunately, slim. I would say though that there must be a way of tuning the mixture with this system so maybe look in to that. For example, setting the idle CO mixture might be a good place to start, if such an option exists on your engine.

[Jaba]

That works out at about 11l/100k or 25mpg. So its quite high, depending on usage and driving style. The mixture is controlled by a lambda sensor so I dont think it is adjustable.
What about the air filter or the mixture enrichment for cold starting being stuck on. Does the engine start and run well if not a sick engine can use a lot more fuel.
Is the thermostat stuck open perhaps causing the running temperature to be low. Just a few thoughts which may or may not help.

[xantia_v6]

The Bosch Mono-Jetronic injection system http://what-when-how.com/automobile/thr ... utomobile/ is a very primitive system. It has no sensor for measuring the manifold pressure or air flow, relying on signals of engine RPM and throttle position for determining fuelling, with medium-term correction form the lambda sensor.

This makes the system very prone to over-fuelling, as any engine fault (or wear) which causes the throttle to be opened a little further will cause an increase in fuel consumption.

A fault will either be one that causes the correct fuel mixture to be burnt inefficiently, or one which is causing a rich mixture to be burned. Monitor the lambda voltage and see whether it is generally indicating rich or lean. This should allow a number of potential faults to be eliminated.

[Kaapelimies]

I would first check the brakes, especially that the parking brake lever in the front brake saddles moves free and frees the parking brake fully.

[Kitch]

Should be getting 34-36mpg or so from one of those. The SPFI version of the TU3 is pretty good on fuel normally.