94 explorer - 341-octane adjust service pin open
Sam
Adjust Service Pin Open.
Can anyone shed light on this one? Does this mean I have to replace
the knock sensors?
Thanks,
Sam Cederas
Raleigh, N.C.
k4...@juno.com
SASCHOCH
writes:
Sam:
The octane adjust service pin is located under the hood, passenger side, in a
wiring harness between the power distribution box and the blower motor. It is
a gray plastic plug apx. 3/8" x 1/2" that connects to a matching socket.
IIRC it retards the timing ~3 deg. so that you can use low octane gas without
damaging the engine. Some people remove the plug to eliminate pinging that
cannot be solved otherwise. Problem is... you lose some power and the gas
mileage is even worse.
HTH.
-Steve
Sam
>I don't think it has any knock sensor. There is a "octane shorting
>bar" gizmo that some people have removed to eliminate pinging.
>Perhaps that's what generated the 341 code.
Well as it turns out you are probably right. I spoke with the my
friend who sold me the vehicle and he told me they did indeed remove
the octane shorting block or whatever you call it. I am also getting
a egr trouble code which is now starting to come on more often. The
explorer is starting to sound like it is missing slightly or just more
sluggish on acceleration. My fathers 94 buick regal had engine light
coming on all the time and had similar perfomance problems and turned
out to be the egr and once replaced the vehicle ran great....no more
of the sluggish performance and surge light feeling during
acceleration and cutting off while coasting to a stop. GOing to
replace the egr valve today.
-Sam Cederas
Raleigh,N.C.
Sam
If I understand correctly...all it does is advance the timing a few
degrees. When this bar is connected...the advance in timing is always
as the bar is ALWAYS shorted.
So...I should be to connect the two wires to a switch or just connect
the two wires back together as the shorting bar was nothing more than
a fancy connector for the two wires and the short was always present.
I inspected mine and I do not have the shorting bar and all that is
left is the connector with two wires...one wire gray with red stripe
and the other wire is gray. The previous owner had a garage perform
the modification to remove the shorting bar and apparently all that is
left is the end of the wire harness.
Am I right on this one guys? Can I connect those two wires together
thus UNDOING the modification previously performed on my 94 Explorer?
Thanks,
Sam Cederas
Raleigh, N.C.
Jacob Suter
higher/dirtier emissions, and much lower fuel economy. Its a last ditch fix
in case you run into some serious trash gas or are troubleshooting
something - its *NOT* a fix for a problem.
Your EGR is probably getting loaded with soot from the crappy exhaust, as
may your cat converter. Both will give you serious performance problems.
Chances are he yanked the octane shorting bar to eliminate preignition
"ping", due to some other very simple to fix problem (lower intake gaskets
and/or lower intake manifold torque back-off usually, or just a carbon
buildup in the cylinders that could be removed with a combustion chamber
cleaner). Throwing higher octane fuel or yanking the block is a really
*BAD* way to cover up the problem.
JS
"Sam" <no...@nunya.com> wrote in message
news:77qfnugacsfibb8c1...@4ax.com...
SASCHOCH
I'll take a look at mine this afternoon and confirm as to whether or not it is
just a straight connector or not. I'll post back.
-Steve('94 EB 4x4)
In article <77qfnugacsfibb8c1...@4ax.com>, Sam <no...@nunya.com>
writes:
SASCHOCH
I pulled the plug and ohmmed it out. It's just a straight connection, no
hidden resistor or diode. 00.0 Ohms.
So, it sure looks to me like you CAN just wire nut the gray/redstripe wire and
the green wire together and have the same setup as original black connector
with gray plug.
Good luck,
-Steve ('94 EB 4x4)
In article <20020906092257...@mb-mg.aol.com>,
Sam
Hey thanks for your help. I appreciate it.
-Sam