Code 44
Thread Starter
Instructor
Joined: Mar 2007
Posts: 162
Likes: 0
From: Mentor Ohio
Code 44
Removed LH Exhaust Manifold because I thought it had a crack in it. Turned out to be the A.I.R. Check Valve Hose to pump was split.
Cleaned up the old Exhaust Manifold and put it back on along with a new A.I.R. Check Valve and a different hose. Hose is from Catalytic Converter Repair Kit so it will take the heat.
Now it seems to throw a code once it gets up to about 184deg or so, it doesn’t immediately come on. Once it is warmed up and you shut it off and restart it, it takes a little while 5 or so minutes for it to throw a code.
Reading FSM it indicates either a problem with A.I.R. or leak in exhaust. It doesn’t say anything about an intermediate code. Strange that it has to run for a certain period of time or reach a certain temperature. Not sure how to check some of the troubleshooting points from FSM.
If it is leaking exhaust where manifold and pipe meet, it has to be a very small gap because you cannot hear any exhaust leak to feel anything either.
Anyone else run into a similar problem like this and has a fix?
Cleaned up the old Exhaust Manifold and put it back on along with a new A.I.R. Check Valve and a different hose. Hose is from Catalytic Converter Repair Kit so it will take the heat.
Now it seems to throw a code once it gets up to about 184deg or so, it doesn’t immediately come on. Once it is warmed up and you shut it off and restart it, it takes a little while 5 or so minutes for it to throw a code.
Reading FSM it indicates either a problem with A.I.R. or leak in exhaust. It doesn’t say anything about an intermediate code. Strange that it has to run for a certain period of time or reach a certain temperature. Not sure how to check some of the troubleshooting points from FSM.
If it is leaking exhaust where manifold and pipe meet, it has to be a very small gap because you cannot hear any exhaust leak to feel anything either.
Anyone else run into a similar problem like this and has a fix?
Burning Brakes
Joined: Feb 2009
Posts: 785
Likes: 3
From: Richmond Virginia
Code 44 indicates the ECM "thinks" the system is lean...could be vacuum leak or bad O2 sensor or AIR valve you replaced possibly bad. I think I'd check any wiring that may have been disturbed/moved when you had the manifold off.(that is wiring related to the O2 circuit)
Last edited by TWISTERUP; Jul 20, 2009 at 03:43 PM.
Safety Car
Joined: Oct 2008
Posts: 4,689
Likes: 4
From: Yucaipa CA
low fuel pressure can cause the code 44. had it happen on my firebird, that rubber line in the the fuel tank that connect to the fuel pump had a hairline crack in it. could only get like 6-8psi but this was on a TBI car. anyways thats what triggered my code 44
