[urq] RE : suddenly lean - the saga continues

[Ado Sigal]

Before deciding if its the head itself, two more things should be 
checked. First remote possibility is the WUR diaphragm, which should 
hold vacuum and pressure (via tube on the top of WUR), and the other is 
to inspect the fuel metering valve. The complete assembly should be 
taken out and the state of the "O" rings (on the body and the plunger) 
should be established.

Ado

>
>Ingo Rautenberg wrote:
>  
>
>>L-A
>>
>>A few things in play, actually.  It can have deposits of varnish or  
>>other debris, and also (more likely) is the fuel pressure regulator  
>>attached to the metering head goes bad -- and not available  
>>separately (so I've heard).
>>
>>Oh, then there's those rubber pieces that can shrink.
>>
>>Mine was also solved by replacing the metering head....
>>
>>Ingo
>>
>>On Feb 16, 2007, at 9:39 AM, Louis-Alain Richard wrote:
>>
>>  
>>    
>>
>>>Jim,
>>>
>>>Just for the sake of knowledge, how can a metering head be bad? In my
>>>memory, it is a purely mechanical device, so what can go wrong ? What
>>>is rebuildable ?
>>>
>>>Louis-Alain
>>>
>>>
>>>-----Message d'origine-----
>>>
>>>Keith,
>>>
>>>I had something similar with my MB a year or so ago - didn't matter
>>>how long I spent getting the mixture and idle speed correct, once I
>>>revved the engine the mixture would be all over the place when it
>>>settled back down to tick over. With the help of a very friendly
>>>tester I managed to get it through the emmissons part of the MoT (set
>>>it, set it, don't touch it, test it quickly) but still couldn't get it
>>>to idle correctly. Gave in eventually and exchanged the metering head
>>>for a rebuilt one - it's perfect now.
>>>Regards,
>>>
>>>Jim Haseltine
>>>
>>>
>>>
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>>  
>>    
>>
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>Have an urq answer? ... Please help others by adding to the KB ... all contributions welcome!
>
>  
>