Emissions and injectors

[TurboJim]

Originally posted by gofstbuick
I got my info from Balco Corp (R&D for SnapOn electronics-mainly their scanner). I asked him to look at the differences between the fed and CA Prom (he only compared PROMs that were CA/fed and Fed only). He explained the code indicated the FED only PROMs activated EGR at a lesser percentage than CA PROMs.
With regards to ASM 5015, that is a steady state test (meaning the emissions are sampled at a steady rate of speed. The IM147 (and IM240 for taht matter) will test at various speeds and different loads. Also, you're relying on the operator to stay within the trace parameters and not make sudden acceration and deceleration (and without relying on the brake pedal). My car also passed CA ASM test, but i noticed that the HCs rode right up on the edge of passing (135 cutpoint and 133 result). A change in injector and PROM brought the HC down to 65, with minimal effect on CO. The NOx curve is bell shaped, so less than 14.7:1 mixture will yield lower NOx numbers and more than 14.7:1 mixture will increase NOx, until around 16:1, at which point NOx will fall to the floor, because the mixture is too lean. So a little CO may not be such a bad thing as it may contribute to cooling compbustion temps.

You probably went from AXCA (pre emissions recall) to BBKJ (emissions recall) calibration. And you're dead on about NOx.

 

[gofstbuick]

TurboJim
I drove the original IM240 trace for the Ca pilot program, using a CA analytical gas bench with a Horiba lab grade dyno. I have seen some different traces (BAR30/30, ASM and Hot 505), but have not seen a IM147. Can you explain the general trace? I figure the time to complete the trace is 147 seconds, but what are the acceleration and deceleration parameters?

 

[TurboJim]

Originally posted by gofstbuick
TurboJim
I drove the original IM240 trace for the Ca pilot program, using a CA analytical gas bench with a Horiba lab grade dyno. I have seen some different traces (BAR30/30, ASM and Hot 505), but have not seen a IM147. Can you explain the general trace? I figure the time to complete the trace is 147 seconds, but what are the acceleration and deceleration parameters?

Sorry, canty help you on IM147. Never heard of it....like thats a surprise

I drove the PA IM240 test when I was going for my license in NJ. It wasnt part of the curriculum, it was a more of "Oh, can I try that?" thing. 2mph and 200rpm window....thats tough man. I give you a lot of credit for running that test. Was in a Honda Accord no less that was squirrely as hell (most of the newer FWD cars are squirrely)

Like I said, the ASM5015 test is easy now. I can pretty much get in any car, and stab it to +/- 2mph, then zero in and run the test.