Re: Fouled plug, injector problem - exhaust manifold crack?

["Daegrigg (Don)" <daegrigg@xxxxxxxxxxx>]

Robert,

Generally, it takes fuel, compression, and spark for your engine to go.
Seems that you have the first two so you might trouble shoot the spark
issue.  Connect a grounded spare plug to the #4 wire to see if you have
spark.  Basic triage but it's a start.


Don

----- Original Message -----
From: Robert Abatecola <robert@domain.elided>
To: <alfa-digest@domain.elided>
Sent: Saturday, April 26, 2003 10:24 PM
Subject: Fouled plug, injector problem - exhaust manifold crack?


> My Spider has not been running too well lately.  Idle is rough and
> there's noticeably less power than normal during acceleration.
> There's a hint of misfire (I think) at all RPM.
>
> During trouble shooting I discovered that the exhaust manifold is
> cracked at #4.  I also found that #4 plug is black and wet.
> Compression is about 165, 160, 160, 150.  If I disconnect the plug to
> the #4 injector while the engine is idling, the engine continues to
> run as if I had not pulled the plug.  All other injector plugs cause
> a drastic change in idle when pulled.
>
> I'm not sure what my next step should be.  The exhaust manifold
> clearly has to be replaced.  But other indications tell me that the
> #4 injector might be bad.
>
> Can the cracked manifold cause the plug fouling and apparent injector
> problem?  How can I confirm if the injector really is bad?
>
> Thanks!
> --
>
>   -Robert Abatecola, San Jose, CA
>    1985 GTV6
>    1987 Spider Quadrifoglio
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