Question about 1990 Ford F350

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1999 Ford E250 van Rough running

My code anylizer says
PO171 = System too lean (Bank 1)
PO302 = Cylinder 2 misfire detected
PO304 = Cylinder 4 misfire detected
PO308 = Cylinder 8 Misfire detected

What can I try

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  • Anonymous Mar 12, 2014

    The service engine soon late has been for about 1month then a few days ago when I left work the car was running like always I had to stop fast and every since then the car runs very rough and even rougher when take off. and if stopped to long it feels like the car is bubbling. Stop at o"reilys to have codes done and the codes are cylinder 6 misfire detected but gives no possible cause available and the other code that comes up is Trouble code P0410 and No possible cause available. so I am trying to find out what the problem is so I can decide if I fix the car or not. Thank you

  • Anonymous Mar 15, 2014

    misfire cylinder 8

  • Anonymous Mar 21, 2014

    It is having a misfire in the number 8 cylinder, and I would like to change the number 8 cylinder however I am unsure of how I would do so myself.

  • Anonymous Mar 21, 2014

    I am wanting to change my number 8 cylinder due to the misfire issue, however I am unsure of how to do this can anyone help me with this.

  • Anonymous Mar 23, 2014

    misfire codes PO300,PO301,PO302,PO304,PO316 its a 2.0 spi sohc engine

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I would like to know what these codes mean


P0171 System Too Lean (Bank 1)
P0174 System Too Lean (Bank 2)
P0301 Cylinder #1 Misfire Detected
P0302 Cylinder #2 Misfire Detected
P0304 Cylinder #4 Misfire Detected
P0306 Cylinder #6 Misfire Detected

Mar 12, 2014 | 1999 Ford Explorer

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Ford f150 2003 po171 always lean bank 1. replaced bank 1 o2 sensor smoked intake. replaced egr valve. still code po171 short term trim 0123 but long term trim is up bank 1 30 anb bank 2 is 27. idle is a...


Code Po171 indicates a lean condition on cylinder bank #1 of the engine. This is the drivers side of the engine. I would suggest replacing both front oxygen sensors as a pair to start. An oxygen sensor has a life span of about 5 years and yours are now 9 years old if they are original. When they get older they are slow to respond to changes in the oxygen content of the exhaust and can trigger a code Po171. If you continue to have the same code set after the replacement of both oxygen sensors then it is time to find out why your engine is running lean. Some of the most common causes are an ignition misfire and a vacuum leak. I have also seen Fords EGR flow sensor (known by Ford as Delta Pressure Feedback sensor) to cause problems like that as well. A good mechanic with a scan tool can usually spot a problem like that in a few minutes.

Mar 01, 2011 | Ford F-150 Cars & Trucks

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Generic code PO171 system 2 lean bank 1 generic


This can be caused by a faulty mass air flow sensor

Jul 06, 2010 | 1999 Ford Taurus

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2003 Ford Ranger 4x4 extended cab- diagnostics checked and got these codes- P0171, P0174, P0300, P0316. Can you tell me what they mean?


P0171------ system too lean bank#1
Po174------ system too lean bank#2
For these 2 codes, try cleaning the maf sensor (mass air flow), that is mounted in the big black hose that goes from the air filter housing to the throttle plate, if it is dirty, that will cause those 02 sensors to send a signal to the computor to lean the air fuel mixture. If cleaning it doesn't work, the sensors will probably need changing.
P0300---- Random/multiple cylinder misfire
P0316---- Cylinder misfire at start up---- first 100 revolutions.
On those 2 codes, you have to do some testing to find out why there is a misfire.
Possible causes:
dirty/malfunctioning injectors
weak coil pack
fowling spark plugs/wires
Low fuel pressure

May 11, 2010 | 2003 Ford Ranger Regular Cab

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I have a 2001 Ford Taurus that shows PO302 and PO171. Can anyboby help me with these codes as my car is running very badly? It is hesitating and running very rough, I would like to solve this problem very...


P0302: Cylinder #2 misfire.
P0171: System too lean, (bank 1)
The first may be a bad spark plug or the wiring to it. If it has been some time since the engine has had a tuneup, change all spark plugs and plug wiring. Check the air cleaner and replace if dirty. If it runs much better, recheck the codes again. If the car has 100k miles or over, it wouldn't hurt to replace the O2 sensors as they do wear out (even though the codes don't show that at this time). Replace the fuel filter as well. Running some injector cleaner through in the fuel will help too. If still having problems, check the system fuel pressure as the pump may be on the verge of failing. Again, the codes don't show this as a problem yet. Good luck.

Apr 12, 2010 | 2001 Ford Taurus

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Why is my 1997 expedition showing a misfire on number 2 cylinder OBD code PO302. Also I am getting code readings PO174 andPO171 system to lean on Bank 1and 2


PO302 is being a misfire, could mean the plug is bad or the coil is bad for that cylinder. Which can give you the misfire reading and the system to lean codes. Check the #2 coil for firing.

Jan 28, 2010 | 1997 Ford Expedition

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Runs Rough, Overheats, Transmission - sometimes auto does not shift correctly - have to use manual


have you changed the spark plugs? also any OBD code after fixing the above?

Jan 15, 2018 | 2001 Volkswagen Passat

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Lack of fuel when accelerating


This might help. It looks like you O2 sencor had gone bad or the signal has and causing multiple mis fire. according to your codes. 
PO171 System too Lean (Bank 1

PO174 System too Lean (Bank 2)

PO300 Random/Multiple Cylinder Misfire Detected

Causes of PO300
Fuel injectors, related wiring, sensors and computer issues
Running out of gas, or poor fuel quality
Evaporative emissions system (EVAP) concerns: fuel vapors leaking into engine
Incorrect Fuel Pressure
EGR system concerns

I'ld start with chaning the O2 sensors first but sheck for bad wire connection. Hope this helps and good luck

Apr 08, 2009 | 2004 Ford F150

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