Lambda fuel trim

[griffer500]

Hi, I having a problem with my Griffith 500, it’s running with too much fuel.
With Rover Gauge connected I have no error in relation to the lambda sensors but my Lambda fuel trim is not okay. Any idea what is wrong here?



Kind regards, Jan-Erik

[blitzracing]

Check the long term trim- this should move slowly until the short term cycles around the center point. If you have any doubt disconnect / reconnect the ECU to reset it after a run, on a hot engine. Then start the car and look at the long term- it will start at zero, and should slowly move over about 2.5 mins at idle, so dont rev the engine, and see where the long term trim settles. Anything less than 100% should allow the short term trim to cycle correctly, although the lower the long term trim the better.

[griffer500]

Thanks Mark,

I allready use your cable and Rover gauge software.
I will use your information on http://www.g33.co.uk/pages/technical-fuel-injectio... as a guideline!.

[griffer500]

The car is still running with a high fuel consumption. The sensor for fuel temperature and coolant temperature are the same. Is it possible that the connectors are mixed up?

Picture of the connector on the fuel rail.

The connector on the coolant sensor is brown.
According Rover gauge the car is running on a right temperature, maybe it uses another sensor?

[blitzracing]

They will be the same on a cold engine, but will change as the engine coolant warms and under bonnet temperatures change and heat the fuel rail.