Air bled screw

[clanman]

On the MPI throtle body theres a small allen screw whitch is the air bled screw apparently, wot I need to know is wot direction you turn it to make the car run richer and leaner. I took the car for its second MOT and the chap tested it for me even though its exempt and its ronning well rich dont know if its because of the new filter and exhaust but it needs sortin.

Thanks for any info in advance.

[Geehawk]

If its running too rich then I doubt it would have anything to do with that screw as presumably the filter would allow more air in anyway.

I would have thought its more likely to be a fuelling issue. Faulty temp sender perhaps.

[BigAndy]

On a modern engine like the K series I doubt that any mechanical controls would ever have been adjusted, the ECU will do it all. I think Geehawks right, the usual cause of cars running too rich is faulty ecu temp sender, which fools the ecu in to thinking the engine is permanently cold and hence its effectively running on choke

[evolotion]

ecu temp sensor(the 2 wire temp sensor on teh water outlet from the front of the engine) or lambda sensor. the "k" runs closed loop idle, so even if you manually poured petrol into the manifold the lambda would dial out enough fuel from the injectors to compensate. within reason ofcource :lol: .

temp sensor can be checked wiht a cup of boiling water cup of icy water and a multimeter, lambda can be tested with a multimeter on teh car. temp sensor is fairly self explanitory , 1 signal wire, 1 earth. lambda has two heater wires (white IIRC) one signal wire and one earth wire , which is which i cant remember but try both ways :lol: with the engine idling and up to temp the lambda signal should flutcuate between ~0v and ~0.8v about every second or so. teh temp sensor, the resistance reading shoudl jsut change proportional to the temp, cant remember the exact values offhand.

[evolotion]

could also be the IAT, but unlikely. this is the we thermistor bubble that potrudes into the throttle body. or something as basic as a blocked fuel return line from the regulator, but the lambda shoudl cope with this at idle, id have thought.

[evolotion]

and finally dont forget no cat = higher emissions. my mini got tested accordign to the standards of its build (1982) and it sailed them, by a factor of ten or so. that was a boggo standard 1.6k on mems with an open filter and RC40.