General Technical Questions and Answers last answered over 1 year ago.
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At the weekend I replaced the HT leads and the air filter on my '86 'velle 1.9. Though whilst I was there I took a look at the idle jet as it's been running rich and using a lot of fuel.
Since then when the choke comes off it just won't idle. I don't understand the Pierburg carb with all it auto choke gubbins.
I rechecked the HT lead firing order but runs perfectly on choke. It will start but after few mins stops. Artifically idling using the pedal it runs very lumpy at low revs. using the main jet at higher revs seems to run normally.
I checked all tubes and pipe connection which all seemd fine.
Saying that I have shortened some of the rubber connectors to the vaccum advance and a couple of thin plastic pipes that connected the summer/winter air cleaner flap and another that goes from the back of the carb to the air cleaner. i imagines this is to do with emission control and ecomony rather than complete shut down of the idle?
I considered removing idle shut off wires to see if it still ran then. Would that help?
If it's the cut off solenoid the easy way to diagnose is to disconnect the wire with the ignition on - if it clicks it is probably ok, if that isn't it cleaning and blowing through the whole carb and each jet with an air line should sort it out (fingers crossed - I had just that with my Weber carb one last night and needed the AA to tow me the last 100 yards home but seems fine after cleaning).
Why does the not quite finished job before last always conspire with the not quite started job after next to make what you should be doing now harder?
right checked all the hoses againa and the idle cut off.
id idles on choke and did uidel off choke stop and restarted again so theought i'd take it for a run. got the the end of the road it with a few pops out the exhaust it cuts out again.
Would it have anything to do with the idel stbiliser unit or the hall generator?
Could try the old trick, if it might have a blocked jet.
Rev it through the range of interest, and clamp your hand over the carb as its moving into the range that gives trouble. equires removing air filters etc. But this, done properly will nearly always clear a blockage in a fixed jet carb and takes 5 minutes or less. Repeat a few times trying to catch it just right, remove cup of hand just before it stalls and repeat.
but seems fine after cleaning).
