from your duplicate post ..

 

Ok... What exactly is a fueling difference Between the left and right banks? Do you think you could help me better understand? Where in the car doesthis problem take place? Is this something I can fix myself? What would I need to have in orderto correct the "fueling difference betweenL & R banks"?

Iappreciate you guysfor taking the time to answer my post!

 

Can you please help me better understand code: P046, fueling difference between R & L banks? I was also told it could be the fuel pressure regulator. Is this the same thing?Is it possible that I could buy the parts and fix my car?

 

I've read all the posts and I'm surprised that no one came up with the obvious, Northstars contribute to the oil crisis, they leak more oil in a couple months than mostother enginesconsume in a year.Your Northstaris leaking oil on the exhaust crossover that goes right under the oil pan and when it leaks it's drops right on top of the hot exhaust and burns hence the smell.AnotherNorthstar problem is coolant leaks from the manifold that drips down on to the rear exhaust, now the good news, both can be fixed by trading the car into a cadillac dealer, only a cadillac dealer the reason I say this is Northstars have had this problem since 95 and Cadillac won't do anything about it except tell you tofix theoil leak andit will cost 2400.00 and the coolant leak, they usually turn thatinto a head gasket leak, also out of this world. If you do buy another Cadillac Have it pre inspected by the dealer get it in writing that it wasn't leaking at time of purchase and buy a warrantee that will cover it when it does leak. Also get that in writing because it will leak.Good Luck, Jenny

 

this thread fell through the cracks .. read what jenny said.

the p046 is most likely the injectors. usually a connector but sometimes the injector itself.
is the P046 code always running or is it intermittent? when injectors start to fail, they usually
dont go back and forth - connectors do.

 

P046 fueling difference L & R banks will not be set by external oil leaks. P046 is a 4.9 while P119 is northstar code. Stomper is correct bad injector can cause it. It also can be set by blown injector fuse, harness issues, ECM, vacuum leaks at intake gasket where it meets head, exhaust leak(s) before or near manifold mounted O2 sensor, or O2 sensor. On 4.5 pfi if A.I.R. system is not operating correctly. ECM monitors right and left O2s, if sensors are reading far apart one reading rich and the other lean it will set.