emmissions update .Help...................................

[Mike Brewer]

Had a friend around today to try and sort out my problems.We cleaned idle screw and butterfly.Cleaned mixture screw on air mass sensor.Not really gummed up.Checked throttle control sensor ok.Changed coollant temparture sensor.Cars runs ok for a while then looes its idle.Cant adjust mixture.to lower emmissions tesed with a gunson i dont think there was aproblem with the old sensor cleaned plugs.Could do with new leads .i just cant understand why its stalling .Cars pulls through the gears no problems it just wont idle.put in some more injection cleaner.If i cant get it to idle .Iwill have to take it to TVR car parts .can you think of any thing else.i know it could be ecu related but as i said it pulls like a train through the rev range it just idle and emmissions.Sorry it a bit long winded .just becoming frustrated.Thanks for your help Mike 350i s2

[CarbonWedge]

Have you checked for any air leaks - I had one where the plenum joins the trumpet base, which caused similar problems. Good luck getting it sorted.

[Mike Brewer]

Yes we have looked for leaks .No joy 'The car has a rising rate fuel regulator wondererd if its not working at idle.Oh well i iam not giving up.Thank for your reply.....Mike

[adam quantrill]

With the rising rate regulator you need to make sure it's not got excessive fuel pressure at idle, and also the vacuum pipe to the regulator works OK.

[Mike Brewer]

Thanks Adam.Thats what my mate said maybe some thing to do with the problem at idle.Cheers Mike.

[Wedg1e]

Yeah, I'd be looking at the idle fuel pressure if you have one of those things fitted.

[Mike Brewer]

Thanks all how do i check for problems at idle.The car also has a uprated kent cam shaft fitted.Just read a good site about morgan plus 8 cars .The carseems to be surging. i am just not good with spanners .My mate thinks i should take the car to dulford auto motive tvr car parts.Thanks Mike

[Wedg1e]

You need a fuel pressure gauge. Hang on while I ransack the 'net...

This one should do it:

http://cgi.ebay.co.uk/50mm-Pressure-Gauge-Base-Ent...

You just need a 1/4" BSP female pipe tail (Machine Mart probably keep them... this sort of thing: http://cgi.ebay.co.uk/Female-Hose-Adaptor-1-4-BSP-... and a short length of small-bore fuel hose like the injectors use. Screw the hose tail to the gauge, connect the hose with a Jubilee clip then disconnect the hose that feeds the cold start injector, from the fuel rail and connect your test gauge instead (with a Jubilee clip, you don't want a petrol shower).
Turn the ignition on and poke your hand into the airflow meter to move the flap. This'll start the fuel pump and the gauge will show you the fuel rail pressure which should be of the order of 2.5 Bar (on the inner scale) - or about 37psi on the outer scale.

It's a start

Edited for typoos

Edited by Wedg1e on Sunday 5th June 23:19

[Mike Brewer]

Thanks for your help ian .Mike