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

[Alexander Ishii (alexishii]

Hi Jim,

Thanks for the pointer, I'll pop over to Fchat this evening and drop Larry a
note.

    Cheers,
    Alex


on 12/23/10 11:37 AM, jimshadow [at] frontier.com at jimshadow [at] frontier.com
wrote:

> You need to contact Larry Fletcher.   He is "Fletch62" on FChat and his info
> is:
> 
> CIS Flowtech
> 251-929-3771
> 
> Larry is THE master of the CIS and a downright good guy!
> 
> Jim
> Sent from my iPhone
> 
> On Dec 23, 2010, at 11:00 AM, Alexander Ishii <alexishii [at] mindspring.com>
> wrote:
> 
>> 
>> 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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