- First Name
- John
- Joined
- Jan 4, 2023
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- 24
- Messages
- 331
- Reaction score
- 398
- Location
- Fort Mohave AZ
- Vehicle(s)
- Ford Maverick, Ford Fusion (UK), MEV Sonic7
- Engine
- 2.5L Hybrid
You are correct, a probe up the tailpipe of a warmed up engine is pretty much a waste of time. The federal emission test consists of having the car sit for 12 hours at a set temperatue, then cold started and driven through a series of modes, stop start, accel-decel, steady state etc. Then stopped, hood closed and hot soaked then hot started and driven through another series of modes. The exaust is sealed and all the gasses go into the sampleing system. Obviously impossible to do on consumer cars, one of the objectives of OBDII is that the vehicle is constantly doing it's own emission testing and illuminate the MIL if the emission exceed the EPA limits.If you knew anything about emissions testing you would know it's pretty hard to do with measuring tail pipe emissions.
The EVAP system goes through a whole different set of test.
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