Can't stop throwing lean codes
12-10-2010, 08:22 AM
#1
5th Gear Member
Thread Starter
Join Date: Aug 2006
Location: Central NJ
Posts: 2,158
Can't stop throwing lean codes
I've been get 1131 and 1151 lean codes bank 1 and 2 for a good amount of time now. Replace All gaskets from intake manifold and up. The classic aluminum crossover leak was happening on my intake manifold I sealed it with gasket sealer and it worked. Right now it must have a very tiny leak because a small amount of coolant leaked from it over time maybe 8oz in 2 months. I don't think a leak in the cooling system would cause any type of vacuum leaks or non metered air coming in. Any input?
12-10-2010, 06:10 PM
#2
TECH SAVANT
Join Date: Dec 2006
Location: Saint Augustine, FL
Posts: 10,938
You may have already seen this (what the shop manual says about P1130)--work the "possible causes" list from the top down, focus on things that would affect both banks...
12-15-2010, 10:26 AM
#4
Resident Ford Troll
Join Date: Jul 2006
Location: Delaware
Posts: 6,716
I wonder why its not throwing a p0171 and p0174 as well...
I would check all the vacuum lines, especially the one that runs straight to the back side of the intake elbow, they corrode and break apart very easily. IF you just touch them they leave black crap all over your fingers. Also check all the little red and green hard plastic lines and the rubber nipples. Did you try idling the engine and spray some carb cleaner around the intake manifold/elbow area to listen to increases in RPM?
I would check all the vacuum lines, especially the one that runs straight to the back side of the intake elbow, they corrode and break apart very easily. IF you just touch them they leave black crap all over your fingers. Also check all the little red and green hard plastic lines and the rubber nipples. Did you try idling the engine and spray some carb cleaner around the intake manifold/elbow area to listen to increases in RPM?
12-16-2010, 10:55 AM
#5
1st Gear Member
Join Date: Dec 2009
Location: OK
Posts: 83
my car has an EGR delete, so those red and green hoses are not connected to anything, but they ARE capped and sealed well. I've sprayed carb cleaner around the ends of them and there is no leak there. I haven't checked the ones off the back of the plenum yet tho. also my PCV valve had a little oil leaking around there so that's where I thought a leak could be coming from so i replaced it but it didn't help. i can clearly hear a hissing when its under a small load, but at idle and full throttle (any rpm) you can hear it go away.
12-20-2010, 02:25 PM
#10
1st Gear Member
Join Date: Dec 2009
Location: OK
Posts: 83
does anybody have advice as to why i would be hearing a hissing which sounds like a vacuum leak only at mid load or so? it clearly goes away under full throttle and no throttle, but in that mid point there's clearly a leak.
