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Diesel opacity tests for road vehicles
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Posted by jdemaris on September 23, 2006 at 06:47:12 from (69.67.234.67):
I'm trying to help my son out - I'm in New York and he lives in Colorado. He recently took my 6.2 diesel 1987 Suburban back home with him. Colorado requires a diesel "visible smoke" test to register the vehicle. He failed - but not by much. Test consists of putting the vehicle on a dyno, and measuring visible smoke at simulated highway speeds of 40 MPH, 50 MPH, and 60 MPH (or something like that). He failed only the 40 MPH test and was only sligthly out of range (3% high). The guy in the test shop told my son he might try installing a new air cleaner and come back and try again. At $60 for every test, I don't want to see him spend a fortune with trial-and-error testing. I don't understand why they couldn't just pull the air-cleaner out, and if it then passed - just make him spend $15 on a new element.
Anyway, here in New York - we have no such testing - so I'm not up on possible simple fixes. I could turn the pump down - but I hate to do it (I can't anyway since I'm in New York). The altitude is higher in the Denver, CO area where the Suburban now is - which I assume is part of the problem - especial since the diesel does NOT have a turbocharger (which used to be called an altitude compensator?).
So, I'm asking - anybody out there had similar problems and found easy fixes? I suppose a good fuel additive MIGHT help (I've read the claims), also possibly advancing the injection timing, turning the pump down a bit, etc. But, my son is not an experienced diesel mechanic - he's an electrical engineer. So, I'm hoping for a simple fix. I'm wondering if a heavy kerosene mix would accomplish the same thing as turning the pump down? Kersone is lighter than #2 diesel, has less BTUs, so maybe?
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