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Check Eng Light On, 5 codes.... Bank 1 & 2 too lean, Mass Air flow meter, both rear oxygen Senors. Idles rough, runs fine above 1500 rpm.
Idles too high, 1500 then drops down to 500 and has a surge in its low idle, then rpm may climb to 1500. I changes both rear oxygen sensors, mass air flow meter, spark plugs as the engine has 117,000 miles and they were the originals. Still the same problems.Grrr....
I will check the PVC hose and check for vacuum leaks. Any other ides?
Has anyone else run into this similar problem before?
Thanks
Found two vacuum leaks both in the 90 degree PVC hose system. 1) pass side engine to throttle body and the other on the back of the engine on the intake manifold. Found them with carb cleaner and the engine idling. ThanksFound two vacuum leaks both in the 90 degree PVC hose system.
1) pass side engine to throttle body and the other on the back of the engine on the intake manifold. Found them with carb cleaner and the engine idling.
Thanks
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P1137 is HO2S Bank 1 Sensor 2 Lean Or Low Voltage. Oxygen sensor is reading a "lean condition". This code probably is stored from the rough and low idling. So it sounds like you maybe having other issues causing this P1137 code to come up. For lean conditions read this: 1. Vacuum leaks - check for failed or loose vacuum lines, leaking intake gaskets, intake air tubes loose or any other source of un-metered air leaks (leaks after the Mass Air Flow Sensor) 2. Restricted fuel filter or bent/pinched fuel system lines 3. Incorrect input from other sensors, such as the Mass Air Flow Sensor/cam or crank sensors, which may not always drop a separate code 4. Engine misfire ? Yes I know this one may seem weird. You might think that if there is a misfire then you will have all that unburned fuel and it should read rich; right? Well the O2 sensors read only oxygen content in the exhaust, so if you have all that unburned fuel from incomplete combustion then, you guessed it, you also have all that unburned oxygen. High O2 content in exhaust equals a lean reading!
P0172 - Fuel Injection System Too Rich Bank 1
Symptoms- Engine Light ON (or Service Engine Soon Warning Light) - Excessive Fuel ConsumptionPossible 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 connecPossible solutionDirty air filter of faulty air flow sensor are common causes of the problem.
P0174 - Fuel Injection System Too Lean Bank 2
Symptoms- Engine Light ON (or Service Engine Soon Warning Light) - Excessive Fuel ConsumptionPossible 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 connectionPossible solutionDirty air filter of faulty air flow sensor are common causes of the problem.Bottom line possible defective Mass airflow sensor and or O2 sensor in cylinder bank number two.
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.
you may try your rotor button and distributor cap. and spark plug wires. try your map sensor also they tend to cause a lot of misfiring if they go bad.hope this helps.
I think I would try the easiest thing to fix and then see how much straightened out. The fuel tank vacuum will probably be a gas cap not on tight or defective or a gas vapor line has a hole in it. You may need a smoker to find that leak if the gascap is okay,
Bank 1 should have cylinders 1,2,3,4. Since 3 cylinders that are in the same bank are misfiring it must be lack of fuel or bad spark. The tester said that bank was lean. If the plugs were not firing it would be rich with unburned fuel. The tester also indicated the other fuel tank vacuum bleed problem.
You might try the power connector for the Bank 1 injectors or check the injector wiring for #2,3,and 4 to see if they are getting power.
Remember to clear the diagnostic meter to see if the trouble codes return. Would be interested in the outcome.
P0171 indicates a lean condition. The most common cause of this is a defective mass air flow sensor. Also check if any vacuum leaks.P0174 OBD-II Trouble Code
mass air flow sensor is not the problem, I had the exact same problem and have done much research on this. Check the PVC rubber hoses, especially the elbows for cracks. You probably noticed your gas mileage has been horrible too. Hope this helps
The lean running codes are related to the p-1000 code...
Running lean on bank 1 and bank 2 means your oxygen sensors sense too much oxygen in your exhaust flow. This means either your engine is getting unmetered air (air that the engine does not know is coming in, therefore does not send fuel to compensate for...) (air that your mass air flow sensor does not see). You could have either a bad mass air flow (MAF) sensor (in the intake piping after the filter; this sensor tells your engine how much air it's taking in, so it can send the right amount of fuel through the injectors to properly burn with the air available with as little emissions as possible), or you could also have a cracked/broken intake piping after this sensor which lets air in the intake that the sensor does not measure... A large vacuum leak could also let unmetered air in the engine.
Or... Another possibility here would be low fuel pressure (bad fuel pump, bad fuel pressure regulator, fuel leak), as not enough fuel for the air would also cause the same lean condition.
It could be that some oxygen sensors are bad...
These conditions are hard to pinpoint exactly unless you have a scanner that can read sensor data (MAF Flow, fuel pressure, oxygen sensor values)...
The first thing I'd do would be to check for cracks or damage in the intake piping... If there is none, then it might be a low fuel pressure issue, or sensor problems...
I think you will find the aftermarket Cat Conv. is the source of your problem, but without hooking up to the factory test equipment at my disposal at my Ford dealer this at best and educated guess based on 20 years of emission related work, I am a Ford certified master electronics technician
Found two vacuum leaks both in the 90 degree PVC hose system.
1) pass side engine to throttle body and the other on the back of the engine on the intake manifold. Found them with carb cleaner and the engine idling.
Thanks
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