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What cause a rich fuel mixture in a ford F-150 2009 with a flowmaster exhaust

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Vacuum Leak before converter -causes a lean
condition & O2 Sensor report & PCM adjusts
fuel trim to give you rich -when you don't actually
need it -except to compensate for unmetered air leak

The air leak could be intake ducting,pcv,exhaust system,
lots of places,intake leaks,evap system

You need to look at fuel trim on both banks- as well as O2
data- to figure where to go with the fix

Posted on Jan 23, 2013

  • mike Jan 24, 2013

    thanks for the info. a error code comes up with a cat conver error.

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SOURCE: run rough, stalls, exhaust smells

check your engie oil. smell it and make sure that there is no gas getting into your oil.

Posted on Aug 03, 2008

injectronic
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SOURCE: 1993 Hyundai Excel motor runs very rich fuel

sure he has an ecm installed .. its an injection based car.. probably air filter isn't that good .. also check if air intake pass is clear of any wastes

Posted on Jun 27, 2009

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SOURCE: My 1995 Ford F150 pickup with a 5.0 l, 2 wheel drive choking down

dunno about your 95 f150 but mine has now maf sensor it has the speed density set up so you would have to check the air charge sensor and the map (manifold absolute pressure sensor make sure one or both is not bad these to together work like a maf sensor. and of course cause the same symptoms. hope it helps

Posted on Mar 15, 2010

toneman2121
  • 775 Answers

SOURCE: Mazda B2600i

are there any fault codes present? i was looking at the fuel injection diagram on autozone.com and the only thing i can see that controls injector pulse width is the pcm. are all the injectors open for 15ms? you should also check fuel pressure. if you want to look at the diagram, go to autozone.com. register and enter you car. select repair guides, chassis electrical and the wiring diagrams

Posted on Mar 30, 2010

  • 12 Answers

SOURCE: rich fuel mixture at idle, smoke from exhaust,

change the O2 sensor/s and the mass airflow sensor

Posted on May 12, 2010

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I got my carburetor problem fixed but now it runs for a while then starts backfiring it'll shut off let's set for a couple seconds and start right back up can anybody tell me why


That sounds like a fuel/air mixture problem.

Just to confirm .. it is a carburettor, not fuel injection?

As a general rule of thumb (with carburettors..) if it backfires through the exhaust/muffler .. the fuel mixture is too rich.

If it backfires through the carb/air filter, the mixture is too weak.

It could also be a 'sticking' float in the carb.

When an engine is cold the fuel is rich .. lots of fuel .. that's how a choke works.. However, when the engine warms up a rich mixture causes problems. The car may splutter and stall, run sluggish or cut out.

Dec 25, 2015 | Cars & Trucks

1 Answer

P0172 fuel trim system rich bank 1


It can as far as a rich fuel mixture can cause the spark plugs to foul out. The actual problem could be a faulty injector or air flow problem.
The code only states the fuel level in the exhaust is too high.

Jul 15, 2014 | 2002 Ford Windstar Cargo

1 Answer

Getting to much fuel


Most common with fuel injected vehicles (non carburetor) is that the O2 sensor in the exhaust system is bad. This sends a signal to the computer to tell it how much fuel is coming through the exhaust to properly measure a fuel injectors duration of spray into the combustion chamber. When these go out, the computer will start over feeding the engine fuel causing a "rich" or "fuel rich" mixture and excess fuel consumption.

Jan 31, 2014 | Cars & Trucks

1 Answer

2002 ford escape red hot exhaust spudders and rpms drops to almost stall


Carol Ann,
Your catalytic converter is plugged up [restricted] This is causing the exhaust to get red hot and causing the reduction in power. You need to replace this part [$$$} The catalytic converter failed because you have been driving the car for months with the fuel mixture excessively rich.
You need to find and fix the cause of the rich mixture or your replacement catalytic converter will also fail in a few more months.

Dec 21, 2011 | 2002 Ford Escape

1 Answer

2002 pt cruiser code p0172


DTC P0172 - P0172 Fuel Trim System Rich Bank 1... this indicates that the fuel mixture is too rich, but you already know it is running rich.

A rich fuel mixture can be caused by a number of things First, I would suggest checking fuel pressure to make sure it is within normal specs If fuel pressure is too high due to a faulty pressure regulator for example, it will cause too much fuel to be entering the engine.

A leaking fuel injector can cause a rich fuel mixture, as can an injector that is stuck in the open position. When the engine is shut off, monitor fuel pressure with a fuel pressur gauge; it should remain steady.If fuel presure drops when the engine is off, then removing the fuel rail and injectors while still connected to the lines to visually check for a dripping injector may be informative.

There are several engine control system problems that can cause a rich fuel mixture; if you can obtain a scan tool that is capable of displaying live engine data you can check for these possible causes:

1) Low MAP reading; this can be due to a fault in the MAP sensor, MAP circuit, or as a result of low engine vacuum due to a restricted exhaust, jumped timing belt, or low compression on one or more cylinders caused by valve leakage or a leaking head gasket. Compression testing the engine may reveal internal mechanical problems of this type that would cause low engine vacuum. A low engine vacuum reading from the MAP makes the computer think the engine is under heavy load such as during acceleration, so it commands a rich fuel mixture in response. A vacuum leak can also result in a rich mixture for the same reason.

2) Low coolant temperature signal. This can be caused by a fault in the coolant temperature sensor circuit, faulty coolant temperature sensor, low engine coolant level, or a faulty thermostat that is allowing the engine to run too cold.

Keep us updated.

Oct 03, 2011 | 2002 Chrysler PT Cruiser

1 Answer

Exhaust pipe is blowing out a mist of black smoke


BLACK EXHAUST SMOKE IS A RICH FUEL MIXTURE.CAUSE BY WEAK SPARK IGNITION, FAULTY MAP SENSOR CHECK MAP SENSOR VACUUM HOSE AND ELECTRICAL CONNECTOR BECAUSE BAD MAP SENSOR WILL CAUSE RICH FUEL MIXTURE CHECK THE VACUUM LINE GOING TO FUEL PRESSURE REGULATOR, MAKE SURE FUEL PRESSURE REGULATOR GETTING VACUUM AT VACUUM LINE IF NOT LOOK FOR BROKEN OR DISCONNECTED VACUUM LINE TO FUEL PRESSURE REGULATOR, CHECK FUEL PRESSURE REGULATOR VACUUM LINE IF YOU SEE GASOLINE IN VACUUM DIAPHRAM TO FUEL PRESSURE REGULATOR REPLACE FUEL PRESSURE REGULATOR,CHECK THE EVAP CANISTER IF GAS SOAK IT WILL CAUSE RICH FUEL MIXTURE.

Aug 05, 2011 | 1995 Chevrolet Blazer

1 Answer

I have a code reader and the code is P0171 P0174 System too lean. what makes the system too lean?


P0171 - Fuel Injection System Too Lean Bank 1
Possible Causes:
- Intake air leaks
- Front Heated oxygen sensor may be faulty
- Injectors may be faulty
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Mass air flow sensor may be faulty
- Incorrect PCV hose connection

P0174 - Fuel Injection System Too Lean Bank 2
Possible Causes:
- Intake air leaks
- Front Heated oxygen sensor may be faulty
- Injectors may be faulty
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Mass air flow sensor may be faulty
- Incorrect PCV hose connection

What Causes These Codes: Fuel injection system does not operate properly. The amount of mixture ratio compensation is too large. (The mixture ratio is too rich.) The Powertrain Control Module (PCM) monitors the engine Air/Fuel mixture ratio, the actual mixture ratio can be brought closely to the theoretical mixture ratio based on the mixture ratio feedback signal from the heated oxygen sensors 1. The PCM calculates the necessary compensation to correct the offset between the actual and the theoretical ratios. In case the amount of the compensation value is extremely large (The actual mixture ratio is too lean.), the PCM judges the condition as the fuel injection system malfunction and light up the engine light. The codes is usually set when there is an intake leak after the air flow meter, before replacing any parts check for loose or broken hoses and intake gasket leak. On Ford some models dirty air filter, and dirty or faulty air flow sensor are the cause of the problem.

Jan 16, 2011 | 2000 Ford Explorer

1 Answer

I have a F-150 99 with a code of P1131... Is it that sensor off the exhaust manifold the problem?? I also heard you have to have a special tool for this?? It runs great maybe idles a little rough. Does...


The P1131 means that your upstream oxygen sensor (the one closest to the engine) is not switching rich to lean and back as frequently as it should. This could be due to a vacuum leak, a failing oxygen sensor, or a rich fuel mixture.
Rich mixture - Too much fuel, not enough air.
Lean mixture - Too much air not enough fuel.

Jun 29, 2017 | 1999 Ford F150 Regular Cab

1 Answer

Engine backfire on decelleration Timing Checked


if is doing it thru the carb then the fuel mixture is too lean, if is in the exhaust (also called after-fire) the fuel mixture too rich.

Sep 04, 2010 | 1966 Ford Mustang

1 Answer

Rotten egg smeel out of exhaust pipe


The “rotten egg smell” that you mentioned is usually caused by fuel mixture in the engine that is too rich. The catalytic converter may be faulty but before you replace it, the “too rich” fuel mixture needs to be corrected. When the mixture in the engine is to rich, the cat can become very hot, in return, producing this smell.

please rate and god bless.

Mar 21, 2009 | 2003 Chevrolet Cavalier

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