How does it work when it is not the original engine? If an engine has been swapped for a much newer one, are the emissions go with that engine? I know here in BC ( when we had the emission centers ) and there was an engine swap, it was tested at the same level as what the new engine came from example 92 eng 3.5 swap got tested as a 1992 3.5 tighter emissions To the original poster, that sounds like Charles old car
Thanks, Rick
I hate to give such a vague response to your question, but... It depends.
The document link below is a good starting point. But, each I/M testing state/region tends to have different requirements. The EPA doc below discusses the baseline policy/rule, some I/M states/regions might be more stringent, but never less stringent (in theory).
https/www.epa.gov/sites/production/files/documents/engswitch_0.pdf
In a nutshell, it says go ahead and swap engines all day long, but don't screw with the emissions equipment -as it was designed and intended to function on it's original chassis and for it's vehicle class-
In another nutshell, don't put a turbine engine in your 318i and then expect to drive it to work -legally. But, yeah, go ahead and do that S85 swap, just make sure you also swap over every bit of emissions control and you had better do it right or we won't register you veh. We will look under the hood..
One distinct and sometimes confusing part of these stat-by-state regs is that some states test according to the original chassis vin, while other states test according to the donor vehicle vin.
Just make sure you know which state (or rather I/M region) you're in and don't have 2 VIN numbers floating around or you will get nothing but head shaking and red tape.