Taurus Car Club of America : Ford Taurus Forum banner

1 - 7 of 7 Posts

·
Registered
Joined
·
3 Posts
Discussion Starter · #1 · (Edited)
OK here is what's going on,

Car has been great for years on end, Still runs & shifts great untill it acts up.
(randomly)

First notice it will shift up and down at will & search for gears, Converter locks in and out & motor runs bad with very little power.

First thoughts was speed sensor or trans issue so I checked for codes.
with exception on the O2 sensor I am getting codes for every sensor in the car.
Also coil & P/N switch.

Replaced the air intake & coolant sensors then coil. cleared codes ran it 2 days and it all came back. (including codes for the new sensors that were replaced)

Some one mentioned the input sensor could be to blame as if the pcm didn't know what the motor was doing or how fast/slow it was running it would mess everything else up. (just replaced that too)

Cleared codes and I'm back to square one.

Removed and cleaned every ground I could find under the hood and the strap to engine, Also ran another ground from engine to battery. (results are the same) Alternator tested and ok, battery load tested and ok.

Odd codes I get are
no power or low voltage to pin #5 at pcm (which was the input speed sensor & just replaced)

other odd codes, intermittent (something or other) with P/N switch
and open circuit at P/N switch ... (changed it & results are the same)

& Alt. overcharging.. (had it tested 3 times now and checks out ok)

New cable ends and cleaned the terminals

Any ideas?
are there any known wiring issues with this year?

Any & all help would be greatly appreciated ..................
Thanks in advance.................... Sinc. Joe


want to ad,
This will only happen after the engine is at FOT (full operating temp)
Makes a little bit of sense as I'll guess it's when it comes out of "open loop"
&
the speedometer works at all speeds and the ABS light is not on................ Thanks again
 

·
Premium Member
Joined
·
1,090 Posts
Sounds like a transmission range sensor (a.k.a.: P/N Switch) to me. Also, you could have fried the speed sensor or bent the harness pins when testing it at the PCM. (I did it and had to carefully fix it myself.)
 

·
Registered
Joined
·
3 Posts
Discussion Starter · #3 ·
hi

Thanks for the fast reply,
P/N switch changed (new)

Same results,

It's driving me nuts
When it acts up you can smell raw fuel too

Also removed the pcm checked all connections and pins everything looked fine.
(no bent or burnt pins)
 

·
Registered
Joined
·
5 Posts
Since you said you didn't receive codes for O2 sensors, you probably didn't touch those. Disconnect your O2 sensors. An internal short in one of them can cause all sorts of havoc.
 

·
Registered
Joined
·
3 Posts
Discussion Starter · #6 ·
Thanks for all the quick replies,

loudsho92 cpu? aka pcm ? or do we have another control unit in these cars?
 
1 - 7 of 7 Posts
Top