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2006mercurygrand marquis4.6l enggs air doc how to#
2006mercurygrand marquis4.6l enggs air doc code#

If you have one or more fuel injectors that have gone bad that can certainly cause the air/fuel mixture to go bad. If it has gone bad, you may get these codes as it throws off your Grand Marquis’s vacuum level. The EGR system is designed to recycle exhaust gasses for cleaner emissions. If it’s still not working, you may need to get a new one. Another way they can stop working properly is if they get dirty from fuel vapor.Įither way, the mover here is to clean it with a MAF sensor cleaner. It’ll let unfiltered air in and it can quickly get the MAF sensor dirty enough that it will no longer work properly. This typically happens when the air filter has a bad seal. The number one culprit when it comes to the MAF sensor going bad is dirty air. It will have a wiring harness plugged into it. It’ll be located between the air filter and the throttle body. If it has gone bad, the air fuel mixture will be off and the P0174 and/or P0171 codes will show. The mass air flow sensor calculates the volume of air entering the engine. But, as you rev the engine, the fuel trim should dip down to around 0 (give or take a few points). Fuel trim at idle will be greatly affected by a vacuum leak. But, the leak can be anywhere.Ī good scan tool can help you determine if there is a vacuum leak as well. If the engine is letting in unmetered air, the intake manifold leaking is a very high likelihood.

2006mercurygrand marquis4.6l enggs air doc how to#

Here’s a great YouTube video on how to go about finding one.

Take a look around and see if you can find the vacuum leak.

2006mercurygrand marquis4.6l enggs air doc code#

With most vehicles, the most common cause for the P0174 or P0171 code to show is a vacuum leak. Vacuum leaks (particularly at the intake manifold) and the MAF sensor are the most common culprits. Here are the most common causes of P0171 + P0174.

Idle Issues– With the air/fuel mixture altered, the vehicle can idle erratically as the computer compensates to keep the engine running.

It should resolve when you get the air/fuel mixture issue fixed. If you have this code along with P0171 and P0174, ignore the P0300.

Misfire– If the air fuel mixture has gotten too far from factory specs, this can cause the vehicle to misfire or run rough.

Fuel Mileage- may or may not suffer depending on how much the air fuel mixture has changed.

Here are the typical symptoms that something is wrong when your Grand Marquis has codes P0174 and P0171. For most people the first sign that anything is wrong at all is the service engine soon light coming on. There aren’t always drivability issues associated with these codes. Symptoms: P0171 + P0174 Mercury Grand Marquis It can be other things as well, but the intake manifold gasket is a great place to start. When these codes both appear at the same time, it is more often than not the intake manifold gasket that is the cause of the problem. The engine then makes adjustments to compensate and throws these codes, which trigger the service engine soon light. They are both thrown when the oxygen sensors detect that there is not enough oxygen in the exhaust.

P0171 and P0174 occur when the air/fuel mixture on the vehicle gets too lean. It could be getting too much air (think vacuum leak, EGR problem, or mass airflow sensor) or it is not getting enough fuel (bad injectors, weak fuel pump, dirty fuel filter, bad fuel pressure regulator). There are a few reasons that a vehicle will get a lean condition. Lean Condition Meaning: The engine is bringing in too much air to the amount of fuel present.On inline engines, this code is not available, since there is only one “bank” of cylinders. P0174- Fuel Trim System Lean → Bank 2: P0174 indicates that the side of the engine with the first cylinder (Bank 2) is running lean.P0171– Fuel Trim System Lean → Bank 1: P0171 indicates that the side of the engine with the first cylinder (Bank 1) is running lean.

Definitionīoth of these codes are generic, which means they have the same meaning (Grand Marquis or not). When they appear together, it indicates that the entire engine is running lean. By themselves, these are some of the most common OBD2 codes. P0171 and P0174 both indicate that there is a lean condition present in your Mercury Grand Marquis.