Here's a possibility I present to the assembled crowd. It is drawn from
my experience with gasohol-fed 164s. The in-tank fuel pump bushing
turns to jelly and flows into the pump inlet filter screen, plugging
it. When this happens, the pump being mounted in a basket with an air
port at the top, the gasoline level falls too low and the pump sucks
air, feeding this into the fuel supply lines to the engine. Not a
pretty thing. You may find (and others, too) that rough running may be
due to such a fuel supply to the pump cause. The "smoking gun" issue I
found with this was air in the fuel supply lines. The 164 system has a
check valve and it keeps the fuel supply lines at high pressure. When
significant air is present and you try to bleed the pressure away to
disconnect the line from the fuel rail (for instance), you get a LOT of
air blowing out of the line and carrying fuel mist with it. This is not
normal, and is readily identifiable.
Michael
From: George Graves <[email protected]>
Subject: [alfa] My GTV-6 has developed a "miss"
To: "<[email protected]>" <[email protected]>
Date: Friday, April 23, 2010, 11:45 AM
Has anyone here seen this before:
The car started to miss, under load at around 5 grand. At first, it was just
a
slight stumble under load. as long as I didn't push it, it ran fine. It has
been getting worse. Now it runs rough at low RPM and idle, smoothes out
between two and four grand, and starts to break-up again above that. I
checked
the ignition by using an ohm meter on the ignition coil and the DC resistance
is in the middle of the range called out by the shop manual. I tried pulling
each spark plug lead individually to see if the engine got worse or remained
the same. Each pulled wire made the car run worse, so it's not a bad plug or
something that could be attributed to any one cylinder. I checked the
distributor and the rotor and they seem fine. Any ideas?
George Graves
'86 GTV-6 3.0 'S'
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