Question about 1999 Ford Explorer

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I have an explorer that has been diagnose and i have been replacing all the components it is telling me. but i still have a rich burning of fuel at the tail pipe. What else can i check? As well my vehicle can do the run test KOER

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Codes do not tell you to replace anything.
They are usually sensors out of range, for a reason. You don't replace them,as you have found out.

You use the codes to enter a flow chart or diagnostic chart, to start a process to find the cause of the issues you are having. Gets expensive and frustrating doing it your way.
You need system knowledge and apply logic to solve these things.

Posted on Aug 27, 2010

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Disconnect the fuel pressure regulator valve and check pressure, they have been known to leak internally

Posted on Aug 27, 2010


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What does running rich mean? and is it an expensive fix?

The motor runs on a mixture of fuel and air. If the mixture is wrong it's not running at maximum efficiency and in some cases can be bad for the engine. When there's too much fuel in the mix it's called running rich, too little fuel/or too much air then it's called running lean. There are a few reasons why an engine will be providing a wrong mix so it's best to get it professionally diagnosed, that's cheaper in the long run than a new motor. Most likely to be something simple like a dirty air filter but could be broken injectors or faulty ECU.

Jan 02, 2016 | 1999 Ford Explorer

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Failed emission test, codeP2177,P2187,P2188 & P2195 what are these code

What make , model , an year vehicle ? These codes can mean different thing's for different make vehicles

Oct 08, 2015 | Cars & Trucks

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My 1988 jeep cherokee is blowing black smoke but not to heavy and a very rich fuel smell

Black exhaust smoke means the engine is burning too much fuel. The first think you should check is your air-filter and other intake components like sensors, fuel injectors and the fuel-pressure regulator. Other reasons could be a clogged fuel return line. Black smoke is usually the easiest issue to diagnose and fix, but burning unnecessary fuel will definitely affect your fuel economy, so don't think of avoiding this one to save money, it won't work.
Any smoke coming from your car's exhaust pipe is a sign that your car is in distress. Pay attention to what it needs to ensure more miles for your vehicle.

Apr 12, 2014 | 1993 Ford F150 SuperCab

1 Answer

Rich fuel 02 sensor

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 (:^)

Jan 05, 2013 | 1998 Ford Explorer

1 Answer

1999 Ford Truck Explorer 2WD 4.0L SOHC 6cyl is detecting rich or lean air fuel ratio what could it be

try spray cleaning your air mass sensor. be careful and use very little spray. you can damage the air mass sensor with too much spray. the air mass senser tells the computer if your air filter needs to be replaced. it is located between the air filter and the air throttle body.

Dec 03, 2012 | 1999 Ford Explorer

1 Answer

Black smoke coming from the engine

black smoke indicates that the car is running too rich and is not able to burn all the fuel that has entered the will need to have the 02 sensors checked for proper operation.also the sensors that tell the pcm what the engine temp is,what throttle position is could even be a bad fuel pressure regulator causing an increase in pressure.the check engine light must be on as it should have detected this.have it put on a scan tool to see what codes and then a direction of diagnoises can be performed.

May 05, 2011 | 1998 Ford Explorer

1 Answer

My catalyic converter is cherry red

The catalytic converter is the hotest component on a vehicle during operation. I have seen them hot enouigh to glow at night but that was after some hard runs/racing. However, if the vehicle is driven regularly it should not get hot enough to glow. Possible cause would be running to rich "they are designed to burn off excessive fuel"
Please vote if this helps

Aug 20, 2010 | 1997 Ford Explorer AWD

1 Answer

Burning too much gas

You could have a few things going on here. I'll assume that the "check engine" lamp is on as it is running extremely rich which can be due to a leaking fuel pressure regulator, bad oxygen sensor[s], stuck fuel injector, plugged air filter system, worn ignition components, or restricted exhaust...just to name to most common items that go bad. I would start by having the service codes read and then begining testing and diagnosing based on that information

Jun 01, 2010 | 1999 Chevrolet Blazer

2 Answers

I did change the top oxigen sensor because was the light service soon the light desapared after 5 days the light came again now what is the problem?

The same problem you had in the first place. Did you go to ottozone? they tell everybody the oxygen sensor is bad. First you need the trouble code, then the repair shop will know what components to check. Find a qualified repair shop and let them check it out and recommend repairs. Stay away from any chain stores.

Feb 12, 2010 | 1999 Chevrolet Cavalier

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