A real toughy...
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A real toughy...
I have a 2001 Sport trac, with 4.0L. Couple weeks ago i replaced all 3 oxy sensors. Well recently (this week), my CEL came on. So i took it in and they scanned it, and it said bank 1 and 2 lean. So i took them off and took them back in, and they said that octane booster, and premium unleaded does that. Problem is, i have never put either one of those in the engine since it was new. The guy said something else in the engine could be causing the o2 sensors to go out. What could it be? A vacuum leak is pretty much out of the question since all the o2 sensors went out.
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I would check the MAF... since you are getting the Bank1 & 2 lean at the same time and you have new O2 sensors... I would look there. If it is mis-reporting the airflow, it could lean the mixture too much and cause those codes to come up.
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From: Phoenix
You did disconnect the battery for 10 minutes right? This clears the correction factors out. It might still think you have a "rich" condition and it really is running lean. What codes doid you get to prompt the O2 change to begin with?
Also, if it truely is lean, the plugs will be white. Could be a vacuum leak.
Also, if it truely is lean, the plugs will be white. Could be a vacuum leak.
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I have an oil covered air filter, that might be coating the MAF. How do i clean it up? Will check plugs tomorrow to see whats up.
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From: Phoenix
Cleaning MAF is always a good idea. I do not subscribe to the idea that a K & N style oil coated air cleaner accelerates a dirty MAF - at least not by any short term means. I have had such an aircleaner for 3 years now on my truck and in that time I have not had to clean the MAF sensor once. I probably should though just to be safe - but I have not had any drivability problems. Your 2001 should be similar to the older ones - here is where you can find out how. http://draco.acs.uci.edu/explorer/
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The K&N website says they do not believe their filter oil causes any rpoblems with sensors - http://www.knfilters.com/massair.htm
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Ok since the scanner keep saying that bank 1 and bank 2 are lean, im gonna get more deteailed with it. Im decided im gonna go ahead and use a mulit-meter to check the MAF. I just need to know what the values are and what the procedure is to check the sensor.
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From: Phoenix
I'm not sure what resistance values might be applicable to test one. The MAF gets 5 V from the PCM and returns from a little more than 0 V to a little less than 5. For some reason Ford doesn't allow up to 5 though some aftermarket MAF units do. So you can test it while the car is running and watch the voltage go up when you open up the throttle. But there is no way of knowing if any specific voltage readings are correct for a given RPM.
It's actually faster to just remove the damn thing and clean it. If you don't have the security type Torx sockets, break off the little tab in the middle of the screw heads and use a regular Torx. Go to this web site and see how - look under "engine pinging". This is a little older models wise but the concept is the same. http://draco.acs.uci.edu/explorer/
So I agree that a bad MAF will run the car too lean and throw the codes you are getting. You might even have signs of pinging and white plugs instead of brown ones that will also point to a true lean condition. Sometimes the O2 sensors actually work.
It's actually faster to just remove the damn thing and clean it. If you don't have the security type Torx sockets, break off the little tab in the middle of the screw heads and use a regular Torx. Go to this web site and see how - look under "engine pinging". This is a little older models wise but the concept is the same. http://draco.acs.uci.edu/explorer/
So I agree that a bad MAF will run the car too lean and throw the codes you are getting. You might even have signs of pinging and white plugs instead of brown ones that will also point to a true lean condition. Sometimes the O2 sensors actually work.