Since my wifes 1985 escort was motted ,it has been sick. I suspect they have
damaged the carb mixture screw as the co analyser readout  is extremely low
.   The engine revs go up and down every second and screwing in the mixture
screw (VV carb) makes it worse . Haynes says screwing the mixture screw
weakens but is hunting cause by a rich mixture?.The plugs are getting sooty
also. I have put in a new cb and checked timing. ?
thanks for any light on cause of hunting

Steve

Steve Tames wrote:
> Since my wifes 1985 escort was motted ,it has been sick. I suspect they have
> damaged the carb mixture screw as the co analyser readout  is extremely low
> .   The engine revs go up and down every second and screwing in the mixture
> screw (VV carb) makes it worse . Haynes says screwing the mixture screw
> weakens but is hunting cause by a rich mixture?.The plugs are getting sooty
> also. I have put in a new cb and checked timing. ?
> thanks for any light on cause of hunting
> 
> Steve
> 
> 
I don't know the VV carb, but sooty plugs plus hunting suggests wrong 
float level.  Is the needle valve clean, free to move, without crud on 
the seating?  Is the float set wrong or sticking?  Is the air filter 
dirty or clogged - or wet. Is the mixture screw cross-threaded?

Start by assuming that the mechanic tried to correct a mixture error for 
the exhaust test and mucked something up. Go through the manual and see 
what he might have changed.

Jim

In article <g4g7m2$h5c$1@south.jnrs.ja.net>, Steve Tames says...
> Since my wifes 1985 escort was motted ,it has been sick. I suspect they have
> damaged the carb mixture screw as the co analyser readout  is extremely low
> .   The engine revs go up and down every second and screwing in the mixture
> screw (VV carb) makes it worse . Haynes says screwing the mixture screw
> weakens but is hunting cause by a rich mixture?.The plugs are getting sooty
> also. I have put in a new cb and checked timing. ?
> thanks for any light on cause of hunting
> 
Check the diaphragms - they're notorious for splitting.


-- 
Conor

I only please one person per day. Today is not your day. Tomorrow isn't 
looking good either. - Scott Adams

If that was me I'd have it back to the garage and ask the guy to "unmeddle" 
it!!!!
"Conor"  wrote in message 
news:6d1sg9Fe5asU1@mid.individual.net...
> In article <g4g7m2$h5c$1@south.jnrs.ja.net>, Steve Tames says...
>> Since my wifes 1985 escort was motted ,it has been sick. I suspect they 
>> have
>> damaged the carb mixture screw as the co analyser readout  is extremely 
>> low
>> .   The engine revs go up and down every second and screwing in the 
>> mixture
>> screw (VV carb) makes it worse . Haynes says screwing the mixture screw
>> weakens but is hunting cause by a rich mixture?.The plugs are getting 
>> sooty
>> also. I have put in a new cb and checked timing. ?
>> thanks for any light on cause of hunting
>>
> Check the diaphragms - they're notorious for splitting.
>
>
> -- 
> Conor
>
> I only please one person per day. Today is not your day. Tomorrow isn't
> looking good either. - Scott Adams