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Have it tested with a scan tool ,check engine sensor data parameters ! Possible dirty or bad mass air flow sensor ,O2sensor ,Coolant temp sensor, map sensor etc... Check for vacuum leaks , Plugged fuel injectors , dirty throttle plate , also check fuel pressure . Is your check engine light lit ?
Your car cold start valve puts more gas into the system keeping your engine running higher RPM. When you car warms up, the cold start valve will stop working and your car RPM will drop. What you could have is a vacuum hose disconnected which puts more air into your engine - therefore when you press on the gas pedal, your engine would shut off or you find lack of power and then shut off.
ok lets start with the codes they say your getting. P??? which 1's and how many. there are few o2 sensors, are they next to the Exhaust next to the converter? MASS AIR FLOW -MAF use this, for now i am guessing, until i see the correct codes your are getting. this could be the 1 you may have below, please read it........
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.
possible symptoms Engine Light ON (or Service Engine Soon Warning Light)
- Engine stall
- Engine running rough
- Excessive fuel consumption
- Excessive smoke
the code is generated when An excessively high voltage from the sensor is sent to Engine Control Module (ECM).
Fuel system too lean (too much air, not enough fuel) vacuum leaks being the most common, you might want to check for a bad airflow sensor, plugged fuel filter, clogged fuel injectors, low fuel pressure, exhaust leaks, a bad PCV valve, bad oxygen sensor, stuck open purge valve. mass air flow (MAF) sensor are fairly common too. Sometimes the mass air flow sensor just gets dirty and gives false air flow readings.
P0068 Symptoms - Engine Light ON (or Service Engine Soon Warning Light) - Lack/Loss of power - Engine rough idle Possible causes - Large vacuum leak - Leaking air duct system - Mass Air Flow (MAF) poor electrcial connection - Manifold Absolute Pressure (MAP) poor electrcial connection - Faulty Mass Air Flow (MAF) sensor - Faulty Manifold Absolute Pressure (MAP) sensor - TP sensor not seated properly. - Faulty Throttle Position (TP) sensor. - Dirty throttle body When is the code detected? The Powertrain Control Module (PCM) monitors operation rationality check by comparing sensed throttle position to mass air flow readings P0068 DODGE Description The Powertrain Control Module (PCM) monitors a vehicle operation rationality check by comparing Throttle Position (TP) to Mass Air Flow (MAF) readings. If, during a self-test, the comparison of the TP sensor and MAF sensor readings are not consistent with the calibrated load values, the test fails and a diagnostic trouble code is stored in continuous memory.
P0103 - Mass or volume air flow circuit high input.
Symptoms: Engine stalls, running rough, excessive fuel consumption, excessive smoke from the tail pipe, check engine light on.
Possible Causes: 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.
P0116 - Engine coolant temperature circuit range/performance.
Symptoms: Check engine light on.
Possible Causes: Low engine coolant level, ECT sensor harness open or shorted, ECT electrical circuit poor connection, faulty engine coolant temperature sensor (ECT), faulty engine coolant thermostat.
The code you mention, P0172 - Fuel Trim Malfunction - System Too Rich (Bank 1)
The engine is a 2.0 lit (4 cylinder). Have you checked to see if the vehicle's powertrain is still under warranty (to include fuel system problems)? If original owner & under 100,000 miles, it may very well be under the powertrain warranty. Check with your nearest Hyundai Dealership & ask the appropriate questions.
My experience with this particular Fuel Trim Malfunction:
1. Clogged engine air filter restricting proper intake air flow
2. Leaky fuel injectors
3. Fuel pressure too high
4. Faulty MAF (Mass Air Flow Meter/Sensor).
5. Faulty TPS (Throttle Position Sensor).
6. Faulty Intake Air Temperature Sensor (IAT)
7. Faulty Engine Coolant Temperature Sensor (ECT).
These causes are only offered as a place to start looking/diagnosing -- NOT intended to cause you to start throwing money after engine parts which may not be the cause -- have it properly diagnosed (probably under warranty).
Hello. I can assist you. Generally when a scan is done, the technician will clear out all of the codes and hope that the problem self corrects. I am glad you passed the state emissions test. Now let's get to the bottom of the hesitation. Generally all lincoln and ford cars that hesitate like yours have a problem with the "mass airflow sensor". Most likely you will need to replace it.
The Air Flow Sensor or Mass Airflow Sensor (MAF) is one of the components of an electronic fuel injection system and is found in many of modern vehicles. The Mass Air Flow sensor is usually installed inside the intake air duct between the air filter and the engine. The Mass Air Flow sensor is used to measure the amount of air entering the engine. This measurement is used by the engine computer or ECM to calculate proper amount of fuel injected into the cylinders in order to provide optimum combustion and low emissions. Problems with Mass Air Flow sensors are common. Bad or contaminated Mass Air Flow sensor can possibly cause a wide range of various vehicle driveability 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. The "check engine" or "service engine soon" light comes on when the engine computer detects some fault in one of the components of the emission control system.
Start with smaller problems and check the fuel pressure regulator, the mass air flow sensor for these vehicles is pretty pricy. Is the check engine light on? If so, head to your nearest auto zone and have them check for trouble codes. If the check engine light isn't on, its not likely your mass air flow sensor