Hard start, cold start problem, rough idle...now IdleSwitch/MAF code

Derek Pulvino dbpulvino at hotmail.com
Mon Jul 3 13:21:32 EDT 2006

Well, I've erased the fault codes and will see what comes up again.  I also 
checked sjm's site, and it appears to be a fairly common occurrence for the 
solder joints at the idle switch and potentiometer to get sporadic as the 
car gets older.

As to the oil on the MAF, what's the mechanism?  Crankcase vent hose 
attaches on the "downwind" side of the MAF, with the only thing I can think 
of before the MAF being the air filter.

Derek P

>Your MAF codes could also be real if, as I remember, you have very high oil
>consumption. MAF may be contaminated beyond its ability to burn off by
>excessive vapor blow by injected ahead of the MAF.
> > From: "Derek Pulvino" <dbpulvino at hotmail.com>
> > Date: Sun, 02 Jul 2006 13:16:33 -0700
> > To: brfoster at gmail.com, b.benz at charter.net
> > Cc: 200q20v at audifans.com
> > Subject: Re: Hard start, cold start problem, rough idle...now Idle 
> > code
> >
> > Ok, so I ran the fault codes yesterday and got two that seem to make 
> > First was for the idle switch...second for the MAF sensor.
> >
> > The idle switch makes sense, but I do still wonder why it seems to only
> > effect the idling upon restarting a warm car and not when the car is 
> > cold...even after the cold started car has warmed up, and also why this
> > problem only creeps up when the weather is warm.  I checked the 
> > continuity of the switch after getting the code and it's fine...maybe 
> > to do the check on a warm car as that's when the problem arises.
> >
> > On the MAF, problems there do make seem cogent with the odd stumbling 
> > been getting, but I also wonder if an idle switch problem "confused" the
> > system into throwing this (MAF) code.
> >
> > Ran the output tests this morning...everthing cycles just as it's 
> > to, including the ISV.
> >
> > Any input of similar experiences from anybody?  Oh, and my car has 
> > to require more cranking on cold starts now.
> >
> > Derek P
> >

More information about the 200q20v mailing list