Ford Explorer: 94 Explorer w/ ecc codes 176 AND 177. Advise??

Nathan, what were you thinking when you wrote:
: My 94 Explorer w/117,000 miles has been running very poorly lately.
: The symptoms only occur after driving on the highway for a while
: (about 50 to 100 miles). It loses power and runs really rough like
: its misfireing and blows carbon out the exaust. I checked the stored
: codes and got a 176 (HEGO Sensor indicates system lean [RH]) and a 177
: (HEGO Sensor indicates system rich [LH]).

Nathan:

Start here http://www.glue.umd.edu/~singletn/web/pages/fuelpr.html

for more help in diagnosing your problem. Note that my engine
stored a different code for the HEGO rich condition. My Explorer
was also a '92 so maybe the codes changed by '94. I can't remember
when they changed the engine computer software but I was thinking
it wasn't until '95.

Good luck,

jeff

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I'd be interested in what you find out. Mine does the same thing.

When I take a cross country trip, several hundred miles out it starts
sputtering for a few minutes and then recovers. One one trip from
Raleigh NC to Chicago, it did this the whole way. The codes are the
same as what you reported. I replaced the O2 and MAF sensors, but a
year later on another trip, the same thing happened. Mechanics cant
find any problems.

The car runs fine during normal daily driving to/from work/errands.

I basically dont go on any long trips with it anymore.

Sorry I cant help, but you're not the only one with the problem if
thats any consolation. My theory runs something toward fuel injectors
icing up or otherwise not injecting but I 'm just showing my ignorance
here. The problem goes away when the car sits for awhile, then
reoccurs after a few hundred miles.

dickm

On 2 Dec 2003 20:54:38 -0800, net (Nathan) wrote:
 

That sound like exactly the same problem. Me and my wife decided it
is just a home body truck cause it doesn't like long trips. I too had
the mass airflow sensor replaced a couple years back and it did not
help. The problem seems to be getting worse. In fact, I drove it
during thanksgiving break for 450 miles each way and it did it the
entire way at 13 mpg. I don't think its an injector issue because it
is blowing carbon out the exaust which tells me its is trying to burn
too much fuel. (ie not a clogged injector). I ordered a fuel pressure
regulator. I will post to this thread if this does or does not solve
the problem.

singletn <umd.edu> wrote in message news:<bqknon$pd5$wam.umd.edu>... 
Thanks for the link. It will be helpful when I replace my FPR. As
far as the codes go, there are two O2 sensors with different codes for
each one. The RH for lean and rich are 172 and 173 respectively. The
codes changed in '95 when ford started using the ECC-V computer.

Oh, I forgot that the fuel milage dropped down to around 13, just like
yours.

I didnt think it was the fuel pressure because my codes were from the
same side, RH I think... i'd read the codes after a long trip and all
I'd see RH lean, RH rich, RH lean, RH rich, RH lean... well, you get
the idea.

I never noticed any carbon/exhaust smoke out the back of mine. Of
course, I never really looked. I was too worried about getting home.

Dick

On 4 Dec 2003 16:45:54 -0800, net (Nathan) wrote: