Ferrari Mailing List: Re: 308 QV emissions failure and possible misfire

[Alexander Ishii (alexishii]

Title: Re: [Ferrari] 308 QV emissions failure and possible misfire

Hi Gary,

I’m going to order a new set of injectors tomorrow.  Figure that even if they are not the problem, if the current ones are suspect, than I won’t be confidently move on to other possibilities.

    Cheers,
    Alex


on 12/23/10 12:29 PM, Gary Reed at gary [at] garyreedsales.com wrote:

> After 26 years, your injectors are probably all shot.  The factory ones were steel and they corroded over time.
>  
> Replace all of them with upgraded Bosch "brass" injectors.
>  
> Gary
>  
> >  
> > ----- Original Message ----- 
> >  
> > From:  Alexander Ishii <mailto:alexishii [at] mindspring.com>  
> >  
> > To: Gary Reed <mailto:gary [at] garyreedsales.com>  
> >  
> > Cc: The FerrariList <mailto:ferrari [at] ferrarilist.com>  
> >  
> > Sent: Thursday, December 23, 2010 7:58  AM
> >  
> > Subject: [Ferrari] 308 QV emissions  failure and possible misfire
> >  
> >
> >
> > Hi All,
> >
> > So my 84 QV has been stubbornly failing  emissions (in NJ), and after some
> > repeated assertions by my usual mechanic  that "all seems to be well", I've
> > found myself having to try and figure out  the problem myself.
> >
> > At the moment, the car is not idling right in my  mind (despite what my
> > mechanic says).  For one, the idle speeds  "hunts" a bit; not enough to be
> > seen on the tach, but enough to be felt as  a slight change in the vibration
> > frequency of the engine.  Second,  every couple of seconds one gets a
> > just-audible muffled "pop" sound from  the engine, accompanied by a slight
> > puff of extra exhaust out of the tail  pipes (no sound out of the air intake
> > system).  Also, the car is  running sort of on the hot side (coolant temp
> > "idles" at 195).
> >
> > Plugs  and wires were changed not long ago, but other than that, nothing much
> > has  required much tinkering in many years.
> >
> > The "pop" has me thinking than  one-or-more of the cylinders is
> > intermittently misfiring and dumping some  un-burnt fuel into the exhaust
> > manifold (where it is igniting and  "popping").  Given the "every couple of
> > seconds" nature of the  problem, however, I have little doubt that all the
> > sparks will look fine  when I try the usual tests.  Anyone have any
> > suggestions for how I  might try and zero-in on the faulty system (short of
> > swapping-out every  part one-by-one until the issue goes away)?
> >
> > Also, it has also occurred  to me that the problem might be that the
> > injectors are not atomizing  properly, and leading to an complete burn (in
> > turn leading to exhaust  manifold ignition of the leftover fuel).  Has anyone
> > seen symptoms  like the above be remedied with replacement of the injectors?
> >
> > All  thoughts/opinions/experiences would be appreciatively  accepted.
> >
> >     Cheers,
> >      Alex
> >
> >
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