4 replies to this topic

[Paps]

Hi. Looking for some advice please. I have a 1999 1.3i mini mpi and I keep having the smell of fuel coming into the cabin. I’ve given her a full service but this has not helped much.
Using a mot emission tester I can see that the emissions are very high on start up but as soon as the fans come on it’s like a switch is flicked and the emissions drop right down.

Any ideas what could cause over fuelling on star up? My guess is a engine management sensor or poor fuel injector management set up. I would be great full for any suggestions.

Thank you.

[Steve220]

From cold, they do run super rich. Once the car is hot and the fan not turning, are the emissions stoich at idle?

[Paps]

Hi. I checked the emissions when the car was warm without fans running and still no good. I changed the temperature sensor in the thermostat housing and swapped the air filter for a k&n insert. Both things helped reduce the fume smell but still high emissions unless I get the engine really hot and the fans kick in.

[Paps]

There was mention of a EMS sensor on the throttle body but all I could find was a Map sensor and air temp sensor.

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[sonscar]

I am no expert in MINI injection but based on my standalone EFI cars the temp sender tells the ECU to run off the main map as warmup is finished.It then uses a combination of rpm and manifold pressure to inject the correct amount of fuel.The lambda sensor fine tunes this.Without live data it could be any/all of these or exhaust leak,failing cat fuel pressure regulator fuel pump worn out engine and lastly anything else.You need to see the data the ECU is seeing and use some interpretation of the readings.Good hunting.Steve..