i bought an s2 about 6 months ago been doing it up over winter never really run right woz told fuel metering unit woz dodgy when i went to turn mixture screw the tamer proof screw wouldnt come out so got new metering unit one off ebay payed 100 for it the lad said the car woz runing perfect so took his word for it so put the new metering unit on and now car wont start loosened 12 mil nut on top metering unit and theres no fuel cuming out when turning engine over there is fuel going in to it and cuming out and when i push flap down on metering unit then fuel comes out any body got any ideas i can try before i take it to a garage

 

hook up the injector pipes mate they 12mm's you were on about then turn it over and get someone to gently push the flap down it should start and once it does should run fine

 

wot do you mean hook up the injector pipes mate there all on mate

 

they are in the inlet and bolted to the metering head? if so turn it over and push the flap gently mate should fuel up to the injectors

 

i have done mate now ive took oil cap off and stinks ov fuel think engine is flooded from me pushing flap down on metering unit

 

A simple way of describing it would be to say...

When there is no air entering the engine there is no demand for fuel ie) the metering flap (which measures air) will be fully 'up' and not allow any fuel to the injectors. Cranking the engine (as long as there are NO air leaks ANYWHERE) will pull the flap down, thus allowing fuel to be injected.

The more air that enters the engine the more the flap is pushed/pulled down and the more fuel is injected.

This is one of the reasons a slightly weak starter motor upsets an rst more than a car with efi, the starter motor cannot turn the engine over fast enough for the metering flap to be pulled down.

Take all you plugs out, turn the engine over (with them out), clean up your plugs and make sure you have a strong spark.

Check all electrical connections to the metering unit and unplug your cold start injector (for the time being).

Then, after the plugs are back in crank the engine whilst some one pushes the flap down by a FEW mm's NO more or you will flood the engine again.


ie) your metering unit sounds like its doing its job, and your problem probably lies else where,

Rob,

 

Nice bit of info there Rob, didnt even cross my mind about the starter. Another thing to add to my list before the engine goes back in!

 

No worries mate, the starters usually fail when their hot (mine did), they spend their lives under a turbo and above a down pipe so they do get a little toasty!

Rob,