Re: Bad Idling and Missing below 4200 RPM

["Dave Ewing" <rabbit16v@prodigy.net>]

Check throttle body adjustments (butterfly adjustments/idle switches
closed/carbon) and the idle stabilizer valve serviceability.  Should help
your problem. Did the shop set or check your air/fuel mixture?

Dave

> Hi all,
>
> I could use some suggestions.  Car in question is an '86 1.8 16v.  The
> problem is it is running rough at idle (idle speed raises and falls,
> missing), has an off idle stumble, and generally runs like crap (misses,
> slow acceleration) until about 4200 rpm.  It doesn't seem to matter if the
> engine's cold or warmed up.  Recent work (less than 500 miles ago)
includes
> new O2, new distributor, new rotor, new cap, new plugs, four new
injectors,
> timing belt and tensioner, and ignition control unit.  The car fires up no
> problem.  I checked the cam timing and the points line up.  I checked
> ignition timing and it's maybe a couple degrees advanced of 6'.  I thought
> it might be a vacuum leak (since the cam timing turned out to be okay),
but
> the injectors, hose connections at the throttle body and hose connection
at
> the air meter all appear okay (tested with spray lubricant).  Any ideas on
> what to check next?
>
> - Brad
> '86.5 Volkswagen Scirocco 16v
> '76 International Scout II
>
>
>
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