couple engine codes
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Lead Driver
Joined: Sep 2010
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Alright working on my mothers 00 EB expedition with the 5.4.
I read the codes last weekend and it had P0171 and P0174 it also had a very bad idle to it, I cleaned the maf and switched it with one I knew worked, no change. I tracked down to a very badly leaking pcv elbow on back of the intake. Well today I replaced the elbow, it definitely calmed down some. I rechecked the codes and found several more. P0136 p0156 p1131 p1151 p0171 and p0174. I googled them all and they seem to be mostly o2 sensors and the bank 1/2 lean. Im hopping they won't come back. It also had a p0304 which I know is hole 4 misfire and could be the jump that were still feeling.
But in case the codes come back (just disconnected the battery to clear codes) what else can I look at that would cause all these codes? I'll have her drive it some to see what codes come back and put them up here when/if they all come back.
I read the codes last weekend and it had P0171 and P0174 it also had a very bad idle to it, I cleaned the maf and switched it with one I knew worked, no change. I tracked down to a very badly leaking pcv elbow on back of the intake. Well today I replaced the elbow, it definitely calmed down some. I rechecked the codes and found several more. P0136 p0156 p1131 p1151 p0171 and p0174. I googled them all and they seem to be mostly o2 sensors and the bank 1/2 lean. Im hopping they won't come back. It also had a p0304 which I know is hole 4 misfire and could be the jump that were still feeling.
But in case the codes come back (just disconnected the battery to clear codes) what else can I look at that would cause all these codes? I'll have her drive it some to see what codes come back and put them up here when/if they all come back.
Logistics Pro
Joined: Jan 2001
Posts: 3,740
Likes: 37
From: Central NYS
The vacuum leak caused the 171/174 codes, which prolly also caused the misfire and the 136/156 codes as it threw the downstream HO2S out of calibration limits, and also caused the upstream HO2S to stick lean becasue the vacuum leak caused it to actually run............LEAN.
I think your good to go.
I think your good to go.
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rogerranger2122
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