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

["Jeff Greenfield" <alfaguy@xxxxxxxxxx>]

Robert - 

The electronic fuel injectors are pretty reliable and seldom fail.

Did you do the test with a clean spark plug in number 4?

If the plug is fouled and not firing, then pulling the plug on the injector
is no different than pulling the plug wire.

Either, replace the plug(s) or at least move them around and see if the
problem moves with it. FWIW, I've seen fouled plugs that still don't work
after cleaning, so I usually just replace them.

Do this, and let us know the results ...

Jeff

-----Original Message-----
From: owner-alfa@domain.elided [mailto:owner-alfa@domain.elided] On Behalf Of
Robert Abatecola
Sent: Saturday, April 26, 2003 10:25 PM
To: alfa-digest@domain.elided
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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