Po174
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Elder User
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From: NE Wisconsin
Po174
Got a code PO174(lean bank 2). Read some old posts, and intake o rings seem to be the popular conclusion. However, noone ever replied to say that they worked. Have not checked for a vacuum leak yet. Being one bank only, could this be more likely? If I do have to do the o rings how bad are they on a 2000 Mounty pushrod 4.0?
Another Quick question, where is the oil press sending unit on my engine? Need to replace it.
Another Quick question, where is the oil press sending unit on my engine? Need to replace it.
Cargo Master
Joined: Oct 2004
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From: Seneca, SC
not sure on the first questions, but for the oil press sending unit look in the heads somewhere. It should be in one of then, probably towards the back of the head. There's gonna be one large sensor for the coolent temperature, one for oil pressure. It'll have oil on it.
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A code P0174 may mean that one or more of the following has happened:
- The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filters (K&N, etc.) can cause the MAF to become dirty if the filter is over-oiled
- There could be a vacuum leak downstream of the MAF sensor.
Posting Guru
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From: Phoenix
Instead of guessing, pull you plugs and look at them. What color? Black is rich, white is leane, brown is A-OK.
Need to do this since the codes don't mean squat as to what the true problem is. If it lloks like one side is lean and the other is OK, it is 9/10 times a bad O2 (since from a controls perspective, the O2 is the only component input that the PCM will use to turn an entire bank lean or rich.
The other 1/10 times a lean on one side condition can be anything from bad injectors, blown head gasket, cracked head...or something to cause a localized leak on just one side.
Cleaning a MAF is always a good idea but if you only have lean on only one side, it's not caused by the MAF which would obviously affect both sides since it feeds the entire intake.
Need to do this since the codes don't mean squat as to what the true problem is. If it lloks like one side is lean and the other is OK, it is 9/10 times a bad O2 (since from a controls perspective, the O2 is the only component input that the PCM will use to turn an entire bank lean or rich.
The other 1/10 times a lean on one side condition can be anything from bad injectors, blown head gasket, cracked head...or something to cause a localized leak on just one side.
Cleaning a MAF is always a good idea but if you only have lean on only one side, it's not caused by the MAF which would obviously affect both sides since it feeds the entire intake.
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Elder User
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From: NE Wisconsin
Thanks for the ideas. Friday, I'll try pulling the plugs and waving some propane around. Easy and cheap. Waiting for a new hood release cable to come in. Seems like everything always goes at once.
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From: NE Wisconsin
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Posting Guru
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From: Phoenix
Oh my God! You are HIV positive!
Who knows what FTE does with all these codes.
So any real news about what you have found on your truck?
Who knows what FTE does with all these codes.
So any real news about what you have found on your truck?
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Elder User
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From: NE Wisconsin
The hood release cable came in today so I'll have that to put in tomarrow. What a pain, trying to stick a screwdriver in the latch just to open the hood. Both the classics never had this problem.
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From: NE Wisconsin
UPDATE
What a miserable thing to work on. Hate to see what the v8 looks like.
Spark plugs looked good, but I reset the codes and nothing came back. I wonder if it just acted up for a short while and not long enough to change color on the plugs. I waved propane around and didn't find a vacuum leak. I guess we'll wait till it does it again.
What a miserable thing to work on. Hate to see what the v8 looks like.
Spark plugs looked good, but I reset the codes and nothing came back. I wonder if it just acted up for a short while and not long enough to change color on the plugs. I waved propane around and didn't find a vacuum leak. I guess we'll wait till it does it again.
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From: Phoenix
If all you got was the left bank lean code, then it's not likely intake gaskets. There was some early 4.0 intake issues but by 1994, they upgraded the gaskets so your motor is not in the "clasical" realm for intake leaks - that was more for the over head cam motors.
When you get just one side lean or rich, they only control device that affects just one side is the O2 sensor. If there is a control device causing this code, it is the O2 - not MAF, intake air temp, coolant temp, throttle position or crank sensor - these all affect both sides of the motor. So keep that in mind.
If it does come back, then replace the O2 and if it comes back again, you have a head leak issue into one or more cylinders on that side. Could be air or coolant leak but something is making your mixture go lean.
When you get just one side lean or rich, they only control device that affects just one side is the O2 sensor. If there is a control device causing this code, it is the O2 - not MAF, intake air temp, coolant temp, throttle position or crank sensor - these all affect both sides of the motor. So keep that in mind.
If it does come back, then replace the O2 and if it comes back again, you have a head leak issue into one or more cylinders on that side. Could be air or coolant leak but something is making your mixture go lean.
Cargo Master
Joined: Aug 2003
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From: BC Canada
Mr Jharger,
Why discount the issue of gasket O rings, and suggest replacing O2 sensor first, and I quote,
(If it does come back, you have a head leak issue into one or more cylinders on that side. Could be air or coolant leak but something is making your mixture go lean).
Why not look for a leak first then to the more costly issue of changing sensors....
One of my pet peaves is the replacement artists that are so common, they fail to go back to basics and diagnose the problem first, they tend to go and *** -U-ME and we all know what the means.
There are tests to check the validity of O2 sensors without the cost of replacing and hoping you have the right offender.
All that being said, I enjoy your comments and take them with the little grain of salt the Dr allows,
Why discount the issue of gasket O rings, and suggest replacing O2 sensor first, and I quote,
(If it does come back, you have a head leak issue into one or more cylinders on that side. Could be air or coolant leak but something is making your mixture go lean).
Why not look for a leak first then to the more costly issue of changing sensors....
One of my pet peaves is the replacement artists that are so common, they fail to go back to basics and diagnose the problem first, they tend to go and *** -U-ME and we all know what the means.
There are tests to check the validity of O2 sensors without the cost of replacing and hoping you have the right offender.
All that being said, I enjoy your comments and take them with the little grain of salt the Dr allows,
Posting Guru
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From: Phoenix
He's got a pushrod motor, not the SOHC. These motors were relatively fixed by Ford by 2000. Sure the intake could leak but wouldn't be my first guess since only one bank is affected. Intake leak, unless very localized, would affect both banks.
And I'll stand by my comments that the one and only control input that the PCM uses to affect just a single bank A/F mixture is the O2 sensor.
If the poster has more info on his problem now, maybe we can procede on the fix.
And I'll stand by my comments that the one and only control input that the PCM uses to affect just a single bank A/F mixture is the O2 sensor.
If the poster has more info on his problem now, maybe we can procede on the fix.