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Old 06-30-2011, 07:06 PM   #1
t.bird
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SES light after maintenance.

Hi all, I am throwing codes p0171 and p0174 (bank 1 and 2 running lean) after doing some maintenance on my car. The SES light showed up 3 or 4 days after finishing, here is what I originally did:

control arm bushings
Oil/filter change
Tranny fluid
Diff fluid
fuel filter
belts/idlers
waterpump
upper/lower rad hoses
coolant tank
thermostat and housing
sensor(?) on lower rad hose

And here is what I have checked after I threw the codes:

gas cap tight
no splits in intake boot
cleaned MAF sensor again (did this less than a year ago)
cleaned oil cap (there was some gunk on the seal)
spark plugs are 8 months old

The car is running just fine and I can't tell any difference. I haven't driven it that much since I performed the list above...so maybe the light will still turn off itself if I fixed it?

If not, what else should I check? I assume it was something I did. Could something be wrong with the fuel filter? Would that cause the engine to run lean? I wouldn't think it would get air in the system if the pump is upstream of the filter...
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Old 06-30-2011, 07:09 PM   #2
deadpass
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Check your intake boot for holes? Is your MAF plugged in? Did you have to move/remove your intake for the expansion tank?
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Old 06-30-2011, 07:12 PM   #3
t.bird
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Originally Posted by deadpass View Post
Check your intake boot for holes? Is your MAF plugged in? Did you have to move/remove your intake for the expansion tank?
MAF is plugged in. I removed the airbox (up to the MAF) to do the tank. Then removed the MAF to clean and intake boot to check for holes upon getting the SES light, nothing.
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Old 06-30-2011, 07:24 PM   #4
djdonis
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Did you remove LOWER intake boot as well. The cracks usually form on the elbow leading to ICV. Besides THAT there are couple of other places for the air to enter the intake after the MAF: secondary air pump valve vacuum tubes, rubber caps in the back of the intake manifold, vacuum tube from intake manifold to vacuum canister (for exhaust flap thingy...).

I would suggest smoke machine test, but that's too much.
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Old 06-30-2011, 07:25 PM   #5
deadpass
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I'm gonna put my money on the hole in the lower intake boot. Removing the airbox and MAF might have been enough movement to cause a weak spot to tear or a very small hole to be come larger.
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Old 06-30-2011, 07:41 PM   #6
t.bird
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I thought people were mostly having problems with the UPPER boot. Oops, guess I should have realized.

'cause guess where I've got a couple rips!?

Thanks.
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Old 06-30-2011, 07:57 PM   #7
TerryH
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most lean conditions are unmetered air, such as vacuum leaks, intake leaks, etc.
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Old 06-30-2011, 09:18 PM   #8
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most lean conditions are unmetered air, such as vacuum leaks, intake leaks, etc.
or a fuel problem. did you install the fuel filter in the right direction/orientation?
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Old 06-30-2011, 09:19 PM   #9
flashmeow
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diregard..you have a m54b30 so there is no way you can mess up the orientation.

recommend smoke test to find vacuum leak. also recommend fuel pressure test to see if it is a fuel issue
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Old 06-30-2011, 09:23 PM   #10
t.bird
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Originally Posted by flashtwosix View Post
diregard..you have a m54b30 so there is no way you can mess up the orientation.

recommend smoke test to find vacuum leak. also recommend fuel pressure test to see if it is a fuel issue
Ha, I was wondering about that when I installed the filter. I had read a couple of times on here "Make sure you KNOW which way the filter should go back in!" Didn't make much sense to me, there's only one way!

I assume now the filter for other engines isn't as obvious.

Also, See above, I found rips in my lower boot.
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Old 06-30-2011, 09:59 PM   #11
bimminge46
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I'm gonna put my money on the hole in the lower intake boot. Removing the airbox and MAF might have been enough movement to cause a weak spot to tear or a very small hole to be come larger.
ya i'm thinking this also....
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