Question about 1996 Ford F150 Regular Cab

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What sensors are involved when my gas is running lean and/or heavy?

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Maf, 02, computer, vacuum leaks,coolant and air temp sensors. Generally when nothing can be found wrong thru a professional diagnostic approach and the 02 has over 50,000 miles on it we recommend replacing the upstream 02 senor. But first one needs a diagnostic data scanner to make sure all the other sensors are within parameters.

Posted on Jul 10, 2010


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Why is my car messing up

Obviously its problem with your fuel to air mixture. It is building up unburnt fuel due to not enough oxygen. This lack of enough oxygen will cause the stalls and the build up of gas will cause the backfires. Heat affects the mixture ratio. A number of detector are involved in the exhaust system and any one of them could be failing. Throttle Position Sensors, MAP sensor, Oxygen sensors, catalytic converter, etc. You should be getting the check engine light coming on also. Any auto parts place can read you the code numbers for free. They will provide more specific information about failing parts.

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I have a 2003 Hyundai Tiburon, with a 2.7 odb2 scanner on it ... says it is bank 2 is running lean, but when you start it up it smells like it is running rich... Is it getting too much air or too much...

I'd trust the scanner and the exhaust sensor are giving you the correct information- running lean is too much oxygen in the exhaust. The mixture is too lean, whether from metered air (then the gas ratio is too little-check for fuel leaks if you smell gas around the engine. Check for cylinder misfires if you smell gas around the exhaust.), or from un-metered air.
The only two sensors that are for fuel requirements are the two front ones-on each bank of engine. The two rear sensors are for monitoring the efficiency of the catalytic converters.
Check the injectors on bank two. Possible that one of them is not letting in the required amount of fuel. Pull the spark plugs and read them. A good firing plug with the proper air/fuel mixture will have a brown or tan insulator and very little deposits on them or the electrodes. A misfiring plug may have black sooty deposits on it-you can spot it immediately. I don't know if the engine has run lean long enough, but a good firing plug in a lean mixture will have a blistered look to the insulator, like white or blanched. You may find a clue by reading the plugs.
Running lean in the worst case is a problem in the valve train, do a compression test if you haven't found the problem. Not a bad idea to clean the MAF sensor with maf cleaner, available just about anywhere.

Aug 16, 2013 | Cars & Trucks

1 Answer


Code F48 is for low freon in the ac, and code F49 is for the computer turning off the ac compressor because the pressure is too high or the engine temp is too high. So neither code would have a direct effect on the engine running.
You may have to get a mechanic involved that can watch the data stream coming into the computer and check the exhaust gas to see if it is too rich or too lean.

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88 chevy relay switches

How do you know it's actually started for gas?

Are you sure it's actually starved for gas, and not just a bad o2 sensor? Are you having issues with it running properly?

When is it running lean? WOT, idle, always? It's possible you have bad diaphrams and your secondaries aren't opening up, but hard to say without an actual description of the problem.

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Car will start but dies when pressing the gas pedal

It sounds like you have an issue with something in your air/fuel mixture electronics. This could be something in your throttle body, mas air flow sensor, or even an oxygen sensor. When your car is idling the air/fuel mixture is acceptable for the engine to run. When you press on the gas either too much gas is dumped in the engine or too little. If you look at your exhaust pipe you may notice a heavy built up of black soot. This would indicate that your vehicle is running extremely rich (too much gas), if your exhaust is very white then your vehicle is running lean (too little gas). The smell of the exhaust can also tell you something about how the engine is running. If it smells sweet it is running rich. I hope this helps and please don't forget to rate me.

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4 codes P0171,P0174,P2195,P2197

171 system too lean
174 system too lean
2195 - 02 ozygen sensor signal stuck lean Bank1 Sensor 1
2197- 02 ozygen sensor signal stuck lean Bank 2
Sensor 1
The 2 front 02 sensors are located on the front of
the exhaust manifold.
Should solve problem and increase gas mileage.

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Losing gas mileage, left bank running lean

There are 3 oxygen sensors on your van. Left bank would be the front left. Try replacing it and see if that helps but remember to reset the computer. Where I work the sensor costs a little over $100.00.

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