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

[clyde romero (clyderomerof4]

You could also have a bad thermostat that is not opening all the way




"IF YOU CAN MEET WITH TRIUMPH AND DISASTER AND TREAT THOSE TWO IMPOSTERS THE
SAME"

CLYDE

Capt. Clyde Romero Jr.
MANPAD SME 
Clyderomero [at] bellsouth.net
Mobile 678 641 9932

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-----Original Message-----
From: Alexander Ishii [mailto:alexishii [at] mindspring.com] 
Sent: Thursday, December 23, 2010 11:01 PM
To: Clyde
Cc: The FerrariList
Subject: Re: [Ferrari] 308 QV emissions failure and possible misfire


> If the runs hot 
> Back flush the radiator and push water from the back of the radiator
forward
> after spraying the front with 409

Hi Clyde,

Have done all that, as well as sorted through a bunch of other things in the
cooling system.

Car is still running hot (relative to what it has done historically), so I
am continuing to suspect that the engine itself must be throwing-off more
heat than it used to.

    -- Alex

> -----Original Message-----
> From: Alexander Ishii <alexishii [at] mindspring.com>
> Date: Thu, 23 Dec 2010 10:58:02
> To: Clyde<Clyderomerof4 [at] bellsouth.net>
> Cc: The FerrariList<ferrari [at] ferrarilist.com>
> 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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