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Discussion Starter · #1 ·
1993 Ford Escort LX (Manual) 1.9L X83,000+ miles (no clue what value X is).

I have pulled two 4 codes off of the memory test and the following is the results:

171 - fuel system at adaptive limits, oxygen sensor (HEGO) unable to switch
172 - Lack of HEGO switches, indicates lean
181 - fuel system at rich adaptive limit at part throttle, system lean
186 - injector pulse width higher than expected

I'm still just getting into mechanical stuff, but the first three codes sounds like I have a bad O2 sensor. Would you guys recommend I replace it? The fourth code may be from buildup of gunk and injector cleaner should fix that (again, just me guessing).

The issue: The problem is sporatic (sometimes as soon as I start driving it, sometimes after 45 minutes of driving, sometimes not at all -- but usually quite often). I will be going down the road, and all of a sudden, the car looses all of its power (it's go power, not electrical power), and the RPM gauge gets a bit weird (up and down a bit). Pressing on the gas does little more than violently shake the car (the harder I press it). If I get it up past 2,500rpm while its doing this, it kinda straightens out enough to accelerate (which is how I am able to keep driving when it does this).

Again, from what I read and understand, I need to do two things:
1) Replace the O2 sensor.
2) Start feeding the car fuel injector cleaner for a while

It has a new set of spark plugs, as well as new sparkplug wires. New air filter, new oil filter, new fuel filter, etc. I WILL say that for a brief moment while I was running the codes, I heard snapping sounds that sounded like the sparks were jumping, but it only happened once, and briefly, and the car didn't seem to care. Don't know what that was about.

Anyway, any ideas would be great!
 

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I heard snapping sounds that sounded like the sparks were jumping, but it only happened once, and briefly
Do that at night and you'll see where that spark came from.

O2 sensor life is 80k to 140K. I make it a point to replace them as
I soon as a get another Escort. I had 5 counting the Tracer. But I'm
not sure that's your problem.

What kind of mpg are you getting?

My Tracer did this and actually had a small partical resting on the wires
of the MAF sensor. I used tweezers to remove it. Most guys
here would probably say I was crazy to try it as these wire are EXTREMLEY
delicate. If you break them you'll spend $40 bucks at the
Junk Yard or big bucks at the dealer. I just couldn't get the partical to spray off.
 

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Discussion Starter · #3 ·
Yeah I may get another wire set. The MAF seems to be ok but I'll give it another look as well; Though I would expect it to have MAF related codes if it were operating incorrectly.
 

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I'd start out by replacing the 02 sensor and reset the ECU. It may clear all the codes. Sometimes one problem will cause multiple codes.
 

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FordMan59 said:
I'd start out by replacing the 02 sensor and reset the ECU. It may clear all the codes. Sometimes one problem will cause multiple codes.
^+1

I also think all of your codes might be just the O2 sensor.
 

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Discussion Starter · #6 ·
Ok, I replaced the O2 sensor and now it's running butter smooth! I'll let it run for a few days, and retest the memory codes. If those are good, then I'll do one last run test; but I've been driving it all day today with 0 problems.

For future reference though, what weird tool can you get to make getting to the sensor easier? I had maby a 1/2" of space to tighten/loosen the sensor and it took forever to get it off and back on :p
 

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They make an 02 sensor socket, but I always just use a 22 MM box end wrench. If you want to go ahead and reset the codes all you have to do is remove a battery cable for a few seconds and and put it back on.
 

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essial said:
For future reference though, what weird tool can you get to make getting to the sensor easier? I had maby a 1/2" of space to tighten/loosen the sensor and it took forever to get it off and back on :p


Cheap enough at Harbor Freight or just use Autozone loaner tools.
 

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Wondering if this is my problem too. I saw the little Fuse for the HEGO under the dash of my 95 manual so outta curiousity I unplugged it (at wits end with the 500 RPM idle). It's either this or I'm pulling the plugs to see if they need regapped after 1 year not checking them. The HEGO is easier than taking out the spark plug behind the alternator.
 
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