Hi Guys/Girls,
I just replaced the spark plugs in my girl friends 2002 jeep liberty 3.7L Auto. When I pulled the old plugs I was surprised to see that they were white as could be (lean) and ate away to about .070 thousands. Factory specs are .040 thousands so they were pretty ate up telling me that she might be getting some detonation due to the lean conditions. The car has about 67000 on it and she bought it off some guy so idk if they were ever done at 30k like they were supposed to be. Anyways I put NGK iridium's in it so she wouldn't have to worry about them again and replaced the external fuel filter, let her put a few miles on it and pulled them out again to check them. There white like the old plugs (lean) and it is now throwing a P0161 Code which is O2 sensor heater circuit malfunction, Bank 2 sensor 2, so right side after the cat. I guess I am just going to change that sensor and hope that is why its running lean. I also added some Lucus fuel injector cleaner to the fuel tank so we will see what that does. Anyone else got any other ideas why it could be running lean?
I'm worried if its detonating with the iridium plugs that the plugs wont be the first thing ate up. More like a hole through the piston!
Any input is appreciated!
Thanks in advance, Tom
I just replaced the spark plugs in my girl friends 2002 jeep liberty 3.7L Auto. When I pulled the old plugs I was surprised to see that they were white as could be (lean) and ate away to about .070 thousands. Factory specs are .040 thousands so they were pretty ate up telling me that she might be getting some detonation due to the lean conditions. The car has about 67000 on it and she bought it off some guy so idk if they were ever done at 30k like they were supposed to be. Anyways I put NGK iridium's in it so she wouldn't have to worry about them again and replaced the external fuel filter, let her put a few miles on it and pulled them out again to check them. There white like the old plugs (lean) and it is now throwing a P0161 Code which is O2 sensor heater circuit malfunction, Bank 2 sensor 2, so right side after the cat. I guess I am just going to change that sensor and hope that is why its running lean. I also added some Lucus fuel injector cleaner to the fuel tank so we will see what that does. Anyone else got any other ideas why it could be running lean?
I'm worried if its detonating with the iridium plugs that the plugs wont be the first thing ate up. More like a hole through the piston!
Any input is appreciated!
Thanks in advance, Tom