406 2litre idle prob

[Glass]

ok my pug idles around 500 to 800 by the needle rising n dropping slowly while idle ..drops to almost stalling at times during stopping ..then ever so slowly creeps bk .. its worse when say the radio and blowers running basically more electrical load the rev needle drops like a stone after say reving engine to 2000 rpm to almost stalling before kicking bk in to life even if idling
swopped parts with working ones
MAP
TPS
ICV
coolent sensor
no air leaks

been told its running rich tho and to replace the lambda sensor?? which i looked at today was black n that so cleaned it n put it bk but still this idle prob...could it be this sensor ?

[teamster1975]

Welcome mate!
If you say it gets worse when there's more electrical load have you checked the voltage from the alternator?
Have a look through this post for good measure although it sounds as though you've covered most of it.

[FlySpeck]

you dont mention if you have changed the maf, but my golf vr6 used to do that hunty idle thing, and the maf was faulty. Swapped it for a new one (second hand new) and it was perfect, even put the old one back on to see, and the hunting was back.

[Glass]

checked current from the alternator across the battery terminals and got

idle with no load 14.28 to 14.40 keeps changing roughly between these 2 figures but raises slighlty at 2000 rpm

with full load of electrics between 12.19 and 12.33 at idle...but up to round 14.15 to 14.20 at 2000 rpm

thanks for your help and advice in this matter