2002 Mitsubishi Galant gets poor acceleration.

Hi Chris.

p0304 = Number 4 Cylinder Misfire Detected

Faulty spark plug 4
Clogged or faulty fuel injector 4
Faulty ignition coil 4
Fuel injector 4 harness is open or shorted
Fuel injector 4 circuit poor electrical connection
Ignition coil 4 harness is open or shorted
Ignition coil 4 circuit poor electrical connection
Insufficient cylinder 4 compression
Incorrect fuel pressure
Intake air leak

The P0304 code means that the cylinder 4 is misfiring or is randomly misfiring. Start by checking for intake leaks an if no leaks are found the next step is to replace the spark plugs on cylinder 4.


p0102 = Mass or Volume Air Flow Circuit Low Input

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

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.


p0154 = O2 Sensor Circuit No Activity Detected Sensor 1 Bank 2

Faulty Front Heated Oxygen Sensor Bank 2
Front Heated Oxygen Sensor Bank 2 harness is open or shorted
Front Heated Oxygen Sensor Bank 2 circuit poor electrical connection
Inappropriate fuel pressure
Faulty fuel injectors
Intake air leaks may be faulty
Exhaust gas leaks

Replacing the Front Heated Oxygen Sensor Bank 2 usually takes care of the problem.


p0113 = Intake Air Temperature Sensor Circuit High

Faulty Intake Air Temperature (IAT) sensor
Dirty air filter
Intake Air Temperature (IAT) sensor harness is open or shorted
Intake Air Temperature (IAT) sensor circuit poor electrical connection

The Intake Air Temperature (IAT) sensor is built into mass air flow sensor or in some vehicles mounted to the air filter duct housing. The sensor detects intake air temperature and transmits a signal to the Engine Control Module (ECM).The temperature sensing unit uses a thermistor which is sensitive to the change in temperature. Electrical resistance of the thermistor decreases in response to the temperature rise. The Intake Air Temperature signal is used as an input for various systems in the vehicle.



Hope this helps
FYT

http://www.autocodes.com/make/nissan

clean your air flow sensor

Sir, your question is not very clear, but I will still try to post a solution here. Engine missing could be due to any problem in fuel system, ignition system, engine or ECM as well.

LOW ENGINE IDLE SPEED (Poor idling):
-Throttle body (do the cleaning and idle speed learning)
-A /C signal circuit
-Fuel pump control circuit
-Fuel pump
-Intake system
-P C V valve (clogged or open) and hose

ROUGH IDLING:
-Cylinder Compression
-Ignition system (Igniters, spark plugs, wiring harness)
-Spark plug fouled, gap too wide or too short. (1.00-1.1 mm)
-Fuel injector circuit
-E C M power source circuit
-Fuel pump control circuit
-Fuel pump (required pressure 44 psi - 49 psi)
-Throttle body (cleaning)
-Intake system
-P C V valve and hose
-Air fuel ratio sensor
-Heated oxygen s ens or
-Mass air flow meter
-Idle hunting
-Throttle body
-Intake system
-P C V valve and hose
-Air fuel ratio sensor
-Mass air flow meter

HESITATION/ POOR ACCELERATION:
-Fuel pump control circuit
-Fuel pump
-Spark plug
-Ignition system
-Fuel injector circuit
-E C M power source circuit
-Mass air flow meter
-Throttle body (do cleaning)
-Intake system
-Valve timing
-Cylinder Compression

As you haven't stated if its petrol or diesel, I can only give you a general check list. 1. fuel pressure/delivery rate/fuel pressure regulator. 2. fuel filter. 3. intake manifold air control solenoid. 4. air intake system/vacuum system - leaks/blockage. 5.air filter. 6. exhaust system/catalytic converter. 7. engine compression. 8. ignition system. 9. injectors. 10. engine management system - connections. 11. crankshaft position sensor. 12. evaporative emission (EVAP) canister. 13. Mass air flow sensor (MAF). 14. Throttle position (TP) sensor. 15. Engine/clutch/breaks condition. 16. Engine control module (ECM). It seems a lot to check, but that is the list given from a data sheet. Knock yourself out and have fun.

Hello and welcome to FixYa!

It's common on Mitsubishi cars specially when the car ages. The problem will surely be on the MAF (mass air flow) sensor. The MAF controls the vacuum supply in the car and has connectivity on the air and fuel mixture.

If the MAF sensor is faulty, you'll have erratic idle. Sometimes will result to stalling too. The MAF sensor is located in the throttle body where the air intake tube is connected. Once replaced you'll be good.

Hope this helps and thank you for using FixYa!

First off, this sounds like a mass air flow sensor problem or an oxygen sensor problem. Other things to consider are fuel line leaks at connections. Your fuel pump might even be faulty. I would first start looking at the spark plugs to see if they are fouled and replace them if they are real bad. Most of the time the oxygen sensors or mass air flow sensor are messing up, improper gas and air mixtures cause rough acceleration and poor idling as well.

DO YOU HAVE A SERVICE ENGINE SOON LIGHT ON? IF SO YOU WILL NEED TO HAVE IT SCANNED TO READ ANY CODES. A MAF SENSOR CAN MAKE IT RUN LIKE THAT. YOU CAN TRY TO CLEAN IT WITH CARB. SPRAY.

in the inlet air pipe from the air filter to the manifold

PO170 is a fuel trim malufunction. On a V6 this applies to the rear cylinder head. Lots of possibilities as fu"el trim" refers to the volume air flow sensor, fuel injector, fuel pressure, engine coolant senor, air intake sensor, barometric pressure sensor, oxygen sensor, intake air leaks, or cracks in the exhaust manifold

Hi

Thanks for using FixYa. The BUICK Regal Mass Air Flow sensor is usually installed in the intake air duct between the air filter and the throttle body mounted on the intake manifold. Also check the throttle body for mass air flow sensors location.
On mass air flow sensors with a sense wire, this wire can become contaminated with dust particles. These particles can be removed with automotive solvents that are safe for the use on mass air flow sensors. Before replacing the mass air flow sensor check for air leaks in the connecting air ducts and intake manifold. These leaks can cause similar symptoms as a malfunctioning mass air flow sensor.

Bad or contaminated BUICK Regal Mass Air Flow sensor can possibly cause a wide range of various vehicle drivability problems such as stalling, especially when the engine is cold, misfiring, poor acceleration, etc. In addition, a problem with the Mass Air Flow sensor often causes the "check engine" or "service engine soon" light in the vehicle instrument panel to illuminate.

Please do accept the solution if the issue is resolved or else revert for further assistance.

Thanks
Rylee