Bank 1 and 2 running lean - Ranger-Forums - The Ultimate Ford Ranger Resource


4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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  #1  
Old 06-19-2008
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Bank 1 and 2 running lean

My check engine light came on about 2 weeks ago, but my car seemed to be running fine so I wasn't too worried about it then me and my friend got his obd scanner and it says banks 1 and 2 are running lean. So we changed my fuel filter, cleaned the maf off with some cleaner, cleared the codes, and checked all the intake lines. The next morning on my way the lights back on again and the idle is real low, especially when I'm in reverse. So does anyone have any ideas on what I should do know, is there any vacuum lines that could be the problem help my truck runs terrible and I drive a lot for work.
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Old 06-19-2008
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I'd guess a vacuum leak.

Try this first. Create a small vacuum leak. The rpms should go *UP* if you do that. If they do nothing but go down then I would suspect a leak somewhere else.

Otherwise.. could be the IAC. Have you cleaned it? Sometimes even cleaning them doesn't work. Gotta replace it.

Rich
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Old 06-19-2008
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I had a problem with the PCV elbow that connect the PCV tube to the throttle body on the right side near the front of the intake manifold. The rubber gets soft and cracks. My idle was low and slightly rough. It would even die if I let it idle long enough.

I used starter fluid to check for the vacuum leak there and it checked positive for a vacuum leak. The propane method did not work for some reason.

This seems to be a common failure for the 4.0 SOHC engine and a few other Ford engines. It can't hurt to check it out and you may find your problem. It is kind of under the top radiator hose.
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Old 12-09-2008
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4.0 SOHC Right and Left bank lean

I also had a check engine light and a code for Right and left bank running lean. I also had a sucking sound when the automatic trans was shifting to
2nd gear. The vacum hose elbow under the radiator hose on the right side had a crack in it. Ford wouldn't sell me just the elbow, so I had to pay $36 for the whole assembly. I wish I would have been a member sooner because it was making noise way before the check engine light came on. It had been into ford for other repairs at least twice and they never caught it.
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Old 12-15-2008
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Same thing happened to me but when the dealer told me $36 for the whole assembly, I went home and used a 6 inch piece of 5/8 inch heater hose and a 3 inch piece of smaller diameter vacum hose inside the heater hose so it wouldn't collapse and a hose clamp on each end to make sure it stayed put and no problems since. Thirty six dollars my butt. This is why Ford is in trouble.

Last edited by neo16001; 12-18-2008 at 01:42 PM. Reason: spelling
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Old 12-15-2008
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Quote:
Originally Posted by IN2 FX4 View Post
I had a problem with the PCV elbow that connect the PCV tube to the throttle body on the right side near the front of the intake manifold. The rubber gets soft and cracks. My idle was low and slightly rough. It would even die if I let it idle long enough.

I used starter fluid to check for the vacuum leak there and it checked positive for a vacuum leak. The propane method did not work for some reason.

This seems to be a common failure for the 4.0 SOHC engine and a few other Ford engines. It can't hurt to check it out and you may find your problem. It is kind of under the top radiator hose.
x2. I had the same problem as the OP, this solved it.
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Old 01-15-2009
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make it x3 the cold weather around my area does it, cuz its like 12 degrees F out side
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Old 01-16-2009
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X4

I just had the same codes: Banks 1 & 2 running lean. Idle was low. Popped the hood, Used starting fluid to find a small crack in the PCV valve hose right on top of the elbow. Got the $35 dollar part from Ford cuz the back hose was looking ratty too. ;(
Cleared the codes, runs great now.
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