code P0304 and P0175?
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code P0304 and P0175?
I just bought my explorer few days ago from some guy. The engine was running fine all the way back (100 miles) back to home. When i drive it today the engine light comes on. I went to check at AutoZone and i got code P0304( misfiring #4) and P0175( too rich bank#2). What could be the problem? Simple spark wires and plugs would do the trick?
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I did change all six plug. Then i disconnect the batteries and restart again, the lights went off!! But it lights up again after a week drive. What should i check next? Someone advise me to clean up the MAF sensor that might help. It is true?
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Joined: Apr 2003
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From: Wyoming
Cleaning the MAF might help with the PO175 code problem. Are you getting the same codes as before? When cleaning the MAF, use a spray product labeled especially for that rather than carb cleaner.
Other than the check engine light coming on, is the engine running better with new plugs? You'd notice if one cylinder wasn't firing. How did the old spark plugs look?
Other than the check engine light coming on, is the engine running better with new plugs? You'd notice if one cylinder wasn't firing. How did the old spark plugs look?
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Joined: Oct 2006
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Chances are they two codes are directly related. By that, if you have a leaky injector in cylinder number 4, you would get both codes as it would be a miss-fire as well as being too rich in the bank.
If your plugs and wires are in fact good, then you will need to do some work on finding out why you are getting excess fuel into the #4 cylinder. If ti was a vacuum leak it would be a lean bank, since it is rich, vacuum is not the issue.
Don't recall off hand how hard it is to pull an injector. If it is not too bad, pull number 4 and swap it with another one that is easy to get to. Clear the codes and wait for it to trip again. Get the codes read. If it is still number four then you have an issue with the cylinder itself. If it moved to where you put the original #4 injector then it is a defective injector.
If your plugs and wires are in fact good, then you will need to do some work on finding out why you are getting excess fuel into the #4 cylinder. If ti was a vacuum leak it would be a lean bank, since it is rich, vacuum is not the issue.
Don't recall off hand how hard it is to pull an injector. If it is not too bad, pull number 4 and swap it with another one that is easy to get to. Clear the codes and wait for it to trip again. Get the codes read. If it is still number four then you have an issue with the cylinder itself. If it moved to where you put the original #4 injector then it is a defective injector.
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I've seen many misfire codes due to ignition problems, but never once seen it accompanied with a RICH code.
The ONLY time I've ever seen RICH codes was either MAF related, or a stuck injector.
Unplug all six injectors and measure the resistance of each one... they should all be close to one another... if #4 has a drastically different reading, then it is for sure bad. If readings are all the same, then borrow a noid light and make sure #4 injector isn't grounded ALL THE TIME. If it's not, then you'll have to either replace it and hope, or swap it around and see if the misfire moves with it.
Good luck.
The ONLY time I've ever seen RICH codes was either MAF related, or a stuck injector.
Unplug all six injectors and measure the resistance of each one... they should all be close to one another... if #4 has a drastically different reading, then it is for sure bad. If readings are all the same, then borrow a noid light and make sure #4 injector isn't grounded ALL THE TIME. If it's not, then you'll have to either replace it and hope, or swap it around and see if the misfire moves with it.
Good luck.
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