LS3 MAF sensor woes
LS3 MAF sensor woes L76 from Pontiac G8 in 2008 Cadillac CTS
im using the LS3 MAF sensor (card style) and repinned correctly.
the engine will start and run briefly (very rough) then stall.
It will start and run all day with the MAF unplugged and stay running
when I plug the sensor in and read IAT and MAF on the scan tool.
if I turn engine off then restart it will run briefly (very rough again)
then I have to disconnect the battery and MAF sensor to get it to run again.
note: I have crankshaft sensor relearn error code also. Does this have anything
do do with my issue.
any thoughts on this
im using the LS3 MAF sensor (card style) and repinned correctly.
the engine will start and run briefly (very rough) then stall.
It will start and run all day with the MAF unplugged and stay running
when I plug the sensor in and read IAT and MAF on the scan tool.
if I turn engine off then restart it will run briefly (very rough again)
then I have to disconnect the battery and MAF sensor to get it to run again.
note: I have crankshaft sensor relearn error code also. Does this have anything
do do with my issue.
any thoughts on this
On The Tree
Joined: Jan 2018
Posts: 154
Likes: 17
From: Placitas, NM
Is the sensor installed horizontally or vertical?
I was trying to find a way to get 10lbs of 4" intake tubing into a 5 lb space, ended up with the MAF vertical, it started and kept stalling. Moved the MAF tube so it was horizontal and it ran perfect.
I was trying to find a way to get 10lbs of 4" intake tubing into a 5 lb space, ended up with the MAF vertical, it started and kept stalling. Moved the MAF tube so it was horizontal and it ran perfect.
This is the only thing I could think of, so I asked the G8 guys if they tune for the LS3 MAF and the G8 forum is so slow I just re-pinned back to stock and got a G8 MAF from a junkyard and it runs perfect. Thanks for all the replies.
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On The Tree
Joined: Dec 2013
Posts: 126
Likes: 1
Update on this.
I had the intake manifold gasket replaced and they said they found some messed up vacuum lines back there, which they fixed. They broke the oil pressure sensor [or it broke, or it was broken] and it was replaced. The O2 sensor was then replaced. After that the car was running right but then started throwing a code for "catalytic converter efficiency too low" [or something to that effect]. Probably from it running rich. No loss of power, though. Just the code That was fixed with a bottle of cataclean.
Thanks for all the responses and help.
Best,
fastertransam
I had the intake manifold gasket replaced and they said they found some messed up vacuum lines back there, which they fixed. They broke the oil pressure sensor [or it broke, or it was broken] and it was replaced. The O2 sensor was then replaced. After that the car was running right but then started throwing a code for "catalytic converter efficiency too low" [or something to that effect]. Probably from it running rich. No loss of power, though. Just the code That was fixed with a bottle of cataclean.
Thanks for all the responses and help.
Best,
fastertransam
Update on this.
I had the intake manifold gasket replaced and they said they found some messed up vacuum lines back there, which they fixed. They broke the oil pressure sensor [or it broke, or it was broken] and it was replaced. The O2 sensor was then replaced. After that the car was running right but then started throwing a code for "catalytic converter efficiency too low" [or something to that effect]. Probably from it running rich. No loss of power, though. Just the code That was fixed with a bottle of cataclean.
Thanks for all the responses and help.
Best,
fastertransam
I had the intake manifold gasket replaced and they said they found some messed up vacuum lines back there, which they fixed. They broke the oil pressure sensor [or it broke, or it was broken] and it was replaced. The O2 sensor was then replaced. After that the car was running right but then started throwing a code for "catalytic converter efficiency too low" [or something to that effect]. Probably from it running rich. No loss of power, though. Just the code That was fixed with a bottle of cataclean.
Thanks for all the responses and help.
Best,
fastertransam
