Bucking Bronco (was: HELLLLLP! Sudden odd symptom)

[Scalmanini Steve]

Thanks for the ideas, Gary and Doyt.  Plugs were
all identically blackened from running too rich
but the electrode tips were clean.  I displayed
the error codes today (thanks for the tip, Phil)
and got:  2324  Air Mass Sensor
          2341  O2 Sensor
          2322  Intake Air Temp Sensor

The O2 and intake-air-temp sensors tested OK
but the AMS may be the problem.  The wiring
to it tests OK and there's no added resistance
between pins 1 & 2 (per Bentley p. 24-160-3)
but with the ignition on I only got 0.21 V
between pins 1 & 3 (should be 1.2 - 1.5) so
that's where I'll pick up tomorrow.

Aren't AMS's reeeal expensive?

Imagining a lighter wallet,

Steve

--- Scalmanini Steve <sscalmanini at yahoo.com> wrote:

The fuel filter was replaced 6K miles ago in the
180K tuneup and since the engine ran at 3-4K rpm
when the problem first occurred Thursday I figure
it's something else.

Yesterday I replaced the O2 sensor, rotor & cap,
and checked the plug & coil wires.  Afterward it
ran better (idles smoothly, accelerates under load
OK if done slowly, doesn't die when I let off the
accelerator although drops sometimes to ~ 400 rpm)
but if I try to accelerate normally under load,
or any faster, whoa!  Immediately coughs, chokes,
misses, sputters, and then, after maybe 2 seconds,
starts bucking so hard that I don't dare let it
continue.

Today I plan to finally make a code display lamp
and read them for the first time (' never had to
before in the 8 years I've owned it) since the
check-engine lamp is on constantly now.  And
check the plugs (never heard of one dying, but
one dead cylinder might cause this).

Thanks for the suggestion,

Steve

------------------------------------------------------

Did you think of the fuel filter? Might be plugged.

Rich


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