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Rich fuel 02 sensor - 1998 Ford Explorer

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Which one? Does the code say rich? Something a lot of people don't know,is that a poorly burning engine(,say plugs are dirty or wiring is leaking spark), will cause the O2 sensor to read a LEAN mixture because of the volume of uncombusted air,and the sensor will call for more gas,which actually makes the engine even less efficient. So make sure the engine is tuned up well,the air cleaner filter is clean,and so on. THEN replace the designated O2 sensor if problem persists. don-ohio (:^)

Posted on Jan 06, 2013

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1996 cherekee 4lt cold starting idles good warms up idles rough. exhaust fums stink. fueling up spark plugs .speedo289000klm'can any one help


is the problem only on a cold engine, hot or both?
is the hot engine reaching and holding 180F or more as it must?>
its running rich
and that is misfire.
lots of causes for rich. the tests are easy in shop with tools.
  1. a full tuneup.
  2. fuel pressure to high we, use a gauge. (FPR bad?)
  3. leaking injectors.
  4. ECT failure, scan it and must read 180f, hot, if at 180f hot.?
  5. this takes 5 min work on any scan tool (real)
  6. map hose clogged. or leaking. the Map sensor must not be blocked in any way to the plenum vacuum. or it will lie and it will run real bad.
  7. on a hot engine, the 02 sensors can fail, or is good and the exhaust cracks in the header do that. on mine it did 3 times.
cracks in the exh header, there must not he any leaks in that header (or bad gaskets)
or the 02 lies. , goes to 0volts and then engine runs rich as a piggy. (my scan tool shows this is seconds, 02 flat-lined at 0v.
all cars, with 02 do that. with that issue.
02 means oxygen sensor, the front one, not the rear one.

Dec 11, 2016 | 1996 Jeep Cherokee

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Why am I getting P0191, P2198 & P2196 error codes on my 2005 FORD FREESTAR 3.9L?


first change gaz filter...
Replace fps(fuel pressure sensor)

Sep 01, 2014 | 2005 Ford Freestar

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1999 volvo s70 rich black smoke runs bad


Black smoke indicates a rich or too much fuel condition. First thing to check is the fuel pressure regulator on the injector fuel rail. Pluu the vacuum hose off and look for signs of fuel in the vacuum hose. They will rupture the diaphragm and suck fuel in to the intake. Can also be caused by a faulty 02 sensor, bad MAF sensor or bad coolant temp sensor. If the check engine light is on check codes and post the codes.

Jun 12, 2014 | 1998 Volvo S70

1 Answer

Fouls plugs after 50-55mph


its rich, (which engine, there are more than 1) ?????
and is not in closed loop mode (ECU) fix that first.
so diagnose rich.
EFI engines. no country stated, as others have carbs way newer,.
1: too high fuel pressure, (gage it) alldata.com has spec. and steps.
2: injector(s) leak. same tool above finds this, ask.
3: ECT reads low temp all time time, (thermostat bad, or missing?)
4: IAT reads too low. (TBI engines, with MAP sensors)
5: 02 sensors bad. (if all else is good and o2 reads wrong its bad)
6: exhaust leaks near, 02, causing o2 to read lean, forcing max rich.
7: did you run the ECU scan codes? the Check engine flashing light using the diagnostic jumper , yet?

mostly those. there are tests for each. ASE ways and means.

if your swift has a heated 02 sensor, it can even hold closed loop
at idle..... sure can, and if so , i check that first.
then closed loop at 2500 rpm , in neutral. (how is complex)
on these old dogs. suz, the worst ,no scan tools. are sold over the counter. so I must use a scope.
i watch the 02 sensors output. and make sure engine goes to closed
loop, if not i fix that. first.
there are ways to do this, (by me forcing lean or rich using other tricks of the trade. ask. I do so , to see if i can wake up the o2 sensor.
this is all covered in ASE courses...... this magic./

id be all over, fuel pressures, REAL not guessing or squirting checks bs.
id be all over exhaust leaks near the O2.
and first a new 02. most cars, its like long ago ,dead and you
look and the tip is , GONE! 1992 oxy sensors are useless.




Jan 21, 2014 | 1992 Suzuki Swift

1 Answer

My 02' Nissan altima stalls when its cold. But


It is probably the "cold start" cycle. A Temperature sensor will send a signal to the computer in order to make the fuel charge rich and change the timing. This will last less than 3 minutes on many cars.

The process is similar to the old "choke" system adding a timing change to the rich fuel mix. Many cars have 2 Temperature sensors and for those you want to change the one that does NOT work the dash gauge or light. The sensor you want is dedicated to providing temperature info to the computer.

Please rate my info.

Jan 03, 2013 | Cars & Trucks

1 Answer

97 wrangler 2.5 running rich


rich,101
this is a MAP , speed density EFI fueling system,,,,
not misfiring.
in no order,
  1. map reads, low all the time cause rich, (low means low vacuum that is real) the ECU sees that and adds huge fueling.
  2. fuel pressure way too high bad PFR.
  3. injector leaking i do an injector leakdown test, or balance test, like the book shows. (and has 3 causes)
  4. front 02 sensors struck lean , forced ECU to go RICH. Any exhaust (its air sucking in) leaks, cause the 02 to go nuts or stick at 0v all the time. and RICH will happen. unplug it , get better?
we use simple tools to find this.
is vacuum at 19 inches HG at idle.? hot? sealevel #s/
???? clean the map yet?

Sep 08, 2012 | 1997 Jeep Wrangler

1 Answer

2003 300m runs rich new 02 sensors and cat converters cam sensor ?


What is the code ?
Have you checked the fuel pressure regulator ? Is the air filter and intake hose clear ? Is the engine warming up ?

Aug 03, 2012 | Chrysler 300M Cars & Trucks

2 Answers

Mustang gt code po175 how to fix it


P0175 : That means your car is running rich in Bank2.

Could be your 02 sensor or your MAF sensor.

Dec 24, 2010 | 1996 Ford Mustang

1 Answer

Have code p1132 - HO2S11 switches sensor indicates rich. What does this mean?


Rich is referring to your Air/Fuel ratio. Lean is too much air not enough fuel, Stoic is perfect balance between the two, Rich is too much fuel not enough air. Means more than likely you have an 02 sensor that is out.

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