Greetings all. Not an e30 question but an e24/m30 problem.
I recently purchased this vehicle (1986 635CSi) and have been having some issues with passing a California smog test. My smog test guy has been helping me out by giving me a pre-check to get things sorted out prior to the official check. The big issue, at first, was high HC. The first checking I did had the HC come in at 1300 at idle. I changed the O2 sensor, air filter, gave it an oil change and replaced the fuel pump (the one on the car was not correct). Doing all this brought the HC down to 300. A lot better but still too high. The catalytic converter in the car was suspect so I had a new Magnaflow unit installed. HC problem solved! However, this is what happened...
Everything looked great but the 25mph NO went through the roof! How could the NO go from 1 at 15mph to 2704 at 25mph and the same RPM? I don't get it.
Has anyone dealt with this before? Faulty test equipment? AFM perhaps?
I recently purchased this vehicle (1986 635CSi) and have been having some issues with passing a California smog test. My smog test guy has been helping me out by giving me a pre-check to get things sorted out prior to the official check. The big issue, at first, was high HC. The first checking I did had the HC come in at 1300 at idle. I changed the O2 sensor, air filter, gave it an oil change and replaced the fuel pump (the one on the car was not correct). Doing all this brought the HC down to 300. A lot better but still too high. The catalytic converter in the car was suspect so I had a new Magnaflow unit installed. HC problem solved! However, this is what happened...
Everything looked great but the 25mph NO went through the roof! How could the NO go from 1 at 15mph to 2704 at 25mph and the same RPM? I don't get it.
Has anyone dealt with this before? Faulty test equipment? AFM perhaps?
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