fuel consumption AND cold start AND rough idle

[mk1mark at gmail.com (Mark F.)]

On 4/26/05, Mark Malowicki <yurple@hotmail.com> wrote:
> 
>   My '83 Scirocco 1.8L has been having a few problems lately.  It started
> with hard starting when cold.  I checked the cold start valve, thermo time
> switch, and aux air reulator, and they all appear to be working fine.
> 
>   Then, I started having an intermittent rough idle problem, where it would
> drop down a few hundred rpm, then recover, then drop, recover, etc.  It runs
> fine otherwise, it's only idle that's rough.
> 
>   AND THEN, I noticed my fuel mileage dropped way down -- from ~33mpg, to
> 23mpg.  I rechecked the cold start valve to make sure it's not leaking when
> warm, and it doesn't appear to be.  I pulled the plugs to see if one of the
> injectors is stuck open, but all four look the same -- electrode itself is
> light milk-chocolately, with black soot on the rest of the plug.


Check for vacuum leaks...

HTH,

Mark.
75
80 S
90 Audi Coupe Quattro - 10vt