Question about Mercury Grand Marquis

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I put new plugs in it now its stating that i have a vaccum leak or MAF Mass Air Flow sensor problems i took off the sensor and cleaned it with the MAF cleaner and still doing the same thing running rough and act like it want to shut of then its very poor on gas mileage now!

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Sometimes you can purchase a defective spark plug or the problem could be that you mixed up the firing order however this is unlikely but possible. I would pull out each plug to see if they are dirty or black replace the black or wet plug with a new one and recheck the firing order.

Posted on Oct 05, 2009

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Posted on Jan 02, 2017

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3 Answers

What is the meaning of Code P0102?


Code p0102 is for Mass Air Flow Sensor. What it is read this:-
A mass (air) flow sensor (MAF) is used to find out the mass flowrate of air entering a fuel-injected internal combustion engine.
The air mass information is necessary for the engine control unit (ECU) to balance and deliver the correct fuel mass to the engine. Air changes its density as it expands and contracts with temperature and pressure. In automotive applications, air density varies with the ambient temperature, altitude and the use of forced induction, which means that mass flow sensors are more appropriate than volumetric flow sensors for determining the quantity of intake air in each cylinder. (Seestoichiometry and ideal gas law.)

There are two common types of mass airflow sensors in use on automotive engines. These are the vane meter and the hot wire. Neither design employs technology that measures air mass directly. However, with additional sensors and inputs, an engine's ECU can determine the mass flowrate of intake air.
Both approaches are used almost exclusively on electronic fuel injection (EFI) engines. Both sensor designs output a 0.0-5.0 volt or a pulse-width modulation (PWM) signal that is proportional to the air mass flow rate, and both sensors have an intake air temperature (IAT) sensor incorporated into their housings for most post OBDII vehicles. Vehicles prior to 1996 could have MAF without an IAT. An example is 1994 Infiniti Q45.
When a MAF sensor is used in conjunction with an oxygen sensor, the engine's air/fuel ratio can be controlled very accurately. The MAF sensor provides the open-loop controller predicted air flow information (the measured air flow) to the ECU, and the oxygen sensor provides closed-loop feedback in order to make minor corrections to the predicted air mass.

HOW TO CLEAN- Follow this youtube link
https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&cad=rja&uact=8&ved=0CCoQtwIwAQ&url=http%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3D_TO7ZC5N-aA&ei=NoFHVfzDJ4HhgwTGuYCwAw&usg=AFQjCNGzC-DvHLC2ZmSpzMK1Uutl4VVg0A&sig2=DsKgMvmolf4ugVDz0ZXbxQ

May 04, 2015 | Chevrolet Impala Cars & Trucks

1 Answer

I just did a tune up on a 2000 mazda 626 with a V6. the parts changed were the plugs,ignition coil, plug wires, mass air flow censor, air filter, and fuel injector cleaner. the plugs were gapped at .32.i...


9 times out of 10 your problem is going to to be with the MAF Sensor. You changed it, was the old one bad? If not try putting the old one back in. If you bought an aftermarket MAF and didn't replace with an OEM MAF, that could also be your problem. Recheck to make sure it's seated correctly, check the wire connection.
Unless the stickers have been removed, you should have a vacuum line diagram under your hood.
Here are what you should check from top to bottom.
  • A clogged, stuck, or leaking fuel injector
  • Faulty fuel regulator
  • Dirty or faulty mass air flow sensor
  • Faulty coolant temperature sensor
  • Faulty thermostat
  • ECM needs reprogramming
  • Dirty or faulty oxygen sensor
  • Vacuum leak
  • Fuel delivery problem
  • Incorrect fuel pressure

Mar 22, 2017 | 2000 Mazda 626

1 Answer

2003 Grand Am Has P0102


It is not an ECM/PCM problem.
P0102 - Mass or Volume Air Flow Circuit Low Input
Possible causes- Faulty mass air flow sensor
- Dirty mass air flow sensor
- Dirty air filter
- Mass air flow sensor harness is open or shorted
- Mass air flow sensor electrical circuit poor connection
- Intake air leaks Tech notes Before replacing the mass air flow sensor, try replacing the air filter and cleaning the air flow sensor with low compress air or mass air flow sensor cleaner. Reset code and drive vehicle. If the code comes back, it may be necessary to replaced the mass air flow sensor

Sep 27, 2012 | 2003 Pontiac Grand Am

1 Answer

P0101


P0101: MAF or VAF A Circuit Range/Perf

- Dirty mass air flow sensor
- Dirty mass air filter
- Mass air flow sensor harness is open or shorted
- Mass air flow sensor electrical circuit poor connection
- Intake air leaks
- Faulty mass air flow sensor

Before replacing the mass air flow sensor, try replacing the air filter and cleaning the air flow sensor with low compress air or mass air flow sensor cleaner. Reset code and drive vehicle. If the code comes back, it may be necessary to replaced the mass air flow sensor.

Feb 09, 2012 | 1999 Pontiac Grand Prix

4 Answers

P0101 code for check engine light.. possible solutions???


Diagnostic Test Code (DTC) P0101 has a generic description of "Mass or volume air flow circuit range/performance problem". This can be caused by several things including:
> Dirty air filter
> Air leak in air intake system
> Contaminated, deterriorated or damaged Mass Air Flow Sensor
> Poor electrical connections at the Engine Control Module, the Mass Air Flow (MAF) sensor or the Throttle Position Sensor (TPS)
> Faulty MAF or TPS

You should check your air filter and air intake system visually and correct any obvious defects/leaks first.

If a visual inspection does not turn up the cause, then you will need a scan tool capable of reading sensor data to verify the function of the MAF and TPS. You will also need proper electrical diagnostic equipment to verify the integrity of the circuits and continue with diagnosis.

Sep 11, 2011 | 2005 Kia Rio

2 Answers

I took my car to have it checked at Autozone. The results were OEM Number to Cross: P0102. What is wrong with my car?


P0102 refers to the MAF (Mass Air Flow) sensor. It may be dirty, faulty, or have a bad connection. Possible remedies are:

  • Verify that the Mass Air Flow Sensor wiring is connected properly and that there are no broken / frayed wires.
  • Inspect for any air leaks near the MAF sensor.
  • Take the MAF out and clean it using a spray cleaner such as brake cleaner or electrical contact cleaner. Be gentle with the sensor.
  • Check the voltage of the MAF sensor (refer to a repair manual for vehicle specific information)
  • Replace the MAF sensor.

Jul 31, 2011 | 2001 Hyundai Santa Fe

1 Answer

Ijust spent 300. on a complete fuel system clean...carbon blast . my town & country ,01 still hesitates at initial acceleration. Just like it was doing prior to the work. so now what?


do you have an engine light?1) check your spark plugs first. when is the last time you had a tune-up? it could be the ignition/timing. might need a new distributor cap/spark plugs/plug wiring. 2) check your intake and look for any vaccum leaks and check your engine light if you do, if you do and its a mass air flow input low, then you need a new maf sensor. 3) if you have a clean fuel system, then that is eliminated as a problem.

Jun 09, 2011 | 2001 Chrysler Town & Country

1 Answer

I have a 1995 Volvo 850 wich suddenly stalls mostly when comming to a stop bu can also stall while driving. I have had 3 mass air flow sensors instaled in 1.5 years. The first one seemed to do the trick...


I would check the vacumm lines and intake manifold. any vacuum leak will set a maf code. I done alot of maf codes and not replaced one yet. not saying they don't go bad, they do. also you can remove the maf and clean it, use brake clean, and also clean the throttle body, aspecially behind the plate, use a brush if you have to. this does work alot of times and makes some cars run as if it had a major tune up. Let me know

Nov 17, 2010 | 1995 Volvo 850

2 Answers

What doe the code mean p0171 for 2004 mercedes c230 and my check engin light is on? Can some one HELP me please


either a vaccum leak, or a dirty mass air flow (maf) sensor. the sensor you can clean with crc maf cleaner spray at your local auto parts store. as for the vacuum leak, i heard there is a recall for m271 engines to replace two faulty vaccum lines. one line goes to the s/c, and i believe the other one is right next to it. check if your car needs this recall and go from there.

Dec 12, 2009 | 2004 Mercedes-Benz C-Class

2 Answers

Lincoln navigator 98 I have a code p0171 bank1


P0171 - System Too Lean (Bank 1) indicates a bad reading from an O2 sensor or bad MAF sensor.
CausesA code P0171 may mean that one or more of the following has happened:
  • The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filters may cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry.
  • There could be a vacuum leak downstream of the MAF sensor.
Possible SolutionsPossible solutions include:
  • In the vast majority of cases, simply cleaning the MAF sensor does the trick. Consult your service manual for it's location if you need help. I find it's best to take it off and spray it with electronics cleaner or brake cleaner. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling
  • Inspect all vacuum and PCV hoses, replace if necessary
  • Check for a dirty fuel filter and proper fuel pressure

Nov 03, 2009 | Lincoln Navigator Cars & Trucks

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