Question about 1995 Honda Accord

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Rich gas mixture from exhaust ,wires disconnected from o2 sensor

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  • yadayada
    yadayada May 11, 2010

    the O2 sensor wires is the answer.

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Yes, you will need to repair the wiring & correct the situation to provide the engine control computer with the proper signal to know how much fuel to release into the engine through the EFI system.

Unfortunately, too many times these wires are altered by way of resistors or just unplugging them in an effort to get more power & that results in more fuel coming through the exhaust. You are need to check the catalytic converter to see if its functioning, (with raw fuel fumes coming through it may be gone/removed/gutted) normally with the fuel system & exhaust correct, you shouldn't smell fuel coming out of the tailpipe. good luck

Posted on Feb 05, 2010

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Exhaust pipe is blowing out a mist of black smoke


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What is O2 light censur on my 1992 Isuzu trooper



Hi there,

An O2 sensor (also known a HEGO or HO2s) is an electrical 'probe' which is screwed into your exhaust pipe/s (you will see an electrical wire connecting into your exhaust pipe).

Each exhaust pipe will have an O2 sensors (sometines 2 per side - one mounted in front of the catalytic converter and one after the converter).

An HO2 sensor is responsible for heating up the exhaust gas (when starting vehicle from cold) to aid the computer in delivering the correctly Fuel/Air mixture. Once the engine reaches normal operating temperature, the heater section on the O2 sensor then turns off, providing normal exhaust gas measurement for appropriate fuel/air mixture.

An HO2 sensor is critical in the efficient running of an engine.

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Why do my car missfire


All possible causes
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3. clogged/leaky fuel injectors
4. Rich/Lean fuel mixture
5. Poor fuel pressure from fuel pump
6. Weak cylinder compression
7. Vaccum leak(s)
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Engine wont stay on when started unless you step on the gas,service engine soon " light comes on.Scanned it and you get code po172 system too rich.


Okay, lets start with you checking the fuel preasure regulator, this is a common problem with these the regulator leaks and the vac line connected to it starts sucking gas into the intake, this causing it to run rich and depending on how bad the leak is it will stall engine at idle, remove the vacuum hose from regulator and start engine then see if gas shoots out the vac connection on the regulator, if it does then replace regulator, hope this helps.583ec1c.jpg

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Broker wire to my O2 sensor


Try to trace the white wire that leads to the o2 sensor by unwrapping the harness that is in the vicinity of the o2 sensor. Try to fiind the wire that way. That's the way an electrical shop would do it. Resplice the wires together. You've done most of the hard work. Good luck to you. Tprev.gif next.gif --- Oxygen (O2) Sensor OPERATION All Fuel Systems Fig. 1: A standard oxygen (O2) sensor, as shown, is used in all fuel injection system covered in this manual 86734gb4.gif
Fig. 2: On non-turbocharged engines, the oxygen sensor (arrow) is mounted in the exhaust manifold 86734p07.jpg
The oxygen (O2) sensor is a device which produces an electrical voltage when exposed to the oxygen present in the exhaust gases. The sensor is mounted in the exhaust manifold or turbocharger outlet and is electrically heated internally for faster switching when the engine is running. When there is a large amount of oxygen present (lean mixture), the sensor produces a low voltage. When there is a lesser amount present (rich mixture) it produces a higher voltage. By monitoring the oxygen content and converting it to electrical voltage, the sensor acts as a rich-lean switch. The voltage is transmitted to the engine controller which changes the fuel injector's pulse width. The injector changes the mixture.

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What is a lawbda sensor on a 94 Audi 100 cs


All About Lambda Sensors The exhaust gas oxygen sensor (EGO or O2), or lambda sensor, is the key sensor in the engine fuel control feedback loop. The computer uses the O2 sensor’s input to balance the fuel mixture, leaning the mixture when the sensor reads rich and enriching the mixture when the sensor reads lean.
I pulled this off a web site for you, I didn't know what it was either till I saw your thing here. Hope this helps.

Apr 28, 2010 | 1994 Audi 100

2 Answers

Running rich


clean the MAF sensor with some carb cleaner... be carefull not to break the thing wires going across the opening... remove clean the EGR valve and replace them. check for vaccume leaks... best way is with carb cleaner... but be sure not to spray the exhaust and away from intake so it dosnt grab any of it and botch yr results. gl

Dec 21, 2009 | 1992 GMC Sierra

1 Answer

Rich fuel mixture at idle, smoke from exhaust,


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Oct 10, 2009 | 1991 Volkswagen Corrado

1 Answer

Check engine light was on. OBD II scan said both pre-Cat 02 sensors running lean. Also shows P0000 code which is a undefined code. S dash light comes every few days then transmission will stay stuck in 4th...


The pre cat sensors running lean does not mean they need to be replaced. They are are detecting a symptom. You need to know why.

If you are using a basic scantool (code only) you need to look up the P0000 code.
I thought this an odd code. I looked it up in my Autotap unit and it does not exist. The lowest # P (powertrain) code I have listed is P0016.

A regular scan tool, won't scan transmission or body codes, mu Auto tap doesn't either. You need a Tech 2 from the dealer for transmission codes.

First some history. The first O2 sensor was introduced in 1976 on a Volvo. California vehicles got them next in 1980, then federal emission laws made O2 sensors virtually mandatory on all cars and light trucks built since 1981. And now that OBD-II regulations are here (1996 and newer vehicles), most vehicles now have multiple O2 sensors, some as many as four!
The O2 sensor is mounted in the exhaust manifold to monitor how much unburned oxygen is in the exhaust. The signal from the O2 sensor tells the computer if the fuel mixture is burning rich (less oxygen) or lean (more oxygen).
A lot of factors affect the richness or leanness of the fuel mixture, including air temperature, engine coolant temperature, barometric pressure, throttle position, air flow and engine load. Other sensors monitor these factors too, but the O2 sensor is the master monitor for what's happening with the fuel mixture. Problems with the O2 sensor can throw the whole system out of whack.
The computer uses the oxygen sensor's input to fine tune the fuel mixture for the best balance of power, economy and emissions. The engineering term for this type of operation is "closed loop" because the computer is using the O2 sensor's input to adjust the fuel mixture. The result is a constant flip-flop back and forth from rich to lean which helps the catalytic converter operate at its best and keeps the average fuel mixture in proper balance to minimize emissions. It's a complicated setup but it works.
If no signal is received from the O2 sensor, like when a cold engine is first started (more on that in a minute) or the 02 sensor fails, the computer orders a steady, rich fuel mixture. This is referred to as "open loop" operation because no input is used from the O2 sensor to fine tune the fuel mixture. If the engine fails to go into closed loop when the O2 sensor reaches operating temperature, or drops out of closed loop because the O2 sensor's signal is lost, the engine will run too rich causing an increase in fuel consumption and emissions. As you might have guessed, that will set a code and turn on your check engine light.
How does it work? The O2 sensor produces a voltage once it gets hot. The sensor compares how much oxygen is in the exhaust to the oxygen in outside air. The greater the difference, the higher the voltage reading.
If you ever replace an O2 sensor (and if you're a DIY'er this is something you will do eventually), its important to remember that the O2 sensor needs to "breath" outside air to work. So don't put any grease on the sensor because it could block this air flow.
An oxygen sensor will typically generate up to about 0.9 volts when the fuel mixture is rich and there is little unburned oxygen left in the exhaust. When the mixture is lean, the sensor's output voltage will drop down to about 0.1 volts. When the air/fuel mixture is balanced or at the equilibrium point of about 14.7 to 1, the sensor will read around 0.45 volts.
When the computer reads a rich signal from the O2 sensor it leans the fuel mixture to reduce the sensor's reading. When the O2 sensor reading goes lean the computer reverses again making the fuel mixture go rich. This constant flip-flopping back and forth of the fuel mixture occurs anywhere from 2 to 7 times a second at 2500 rpm on OBDII vehicles, depending on what type of fuel injection system they have.
The oxygen sensor must be hot (about 600 degrees or higher) before it will start to generate a voltage signal. Many oxygen sensors have a small heating element inside to help them reach operating temperature more quickly.
Ok – that was a lot of info on what they do and how they work. The next thing to know is that trouble codes relating to O2 sensors are very common. But you really need investigate further before replacing an O2 sensor just because you got that trouble code. Armed with the information above on how often the O2 sensor "flips" back and forth and AutoTap or another scantool that allows you to monitor O2 sensor voltage, you can be certain whether the O2 sensor itself is really the problem. These sensors can be pricey, so don't just replace them the first time you see that trouble code!

The O2 sensors are expensive, diagnose what really is going on.

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injectors ,when dirty, tend not to spray as well,so it might be that......try some fuel injector cleaner. Also if you have a bad o2 sensor .The o2 sensor tells the computer how to mix the air and gas mixture

Jan 21, 2009 | 1992 Toyota Camry V6

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