Had my 87 Buick 2.5L 102K miles on it smog tested yesterday and it failed
both @ 15mph and 25mph. The numbers were twice that is allowed 1400-1500ppm
allowed is 750-800ppm. The HC and CO are both in the low range of allowed. I
did a tune up
of plugs and filers and oil change first and warm the car up before the
I thought it might be the EGR valve and when we tested it with vacuum it
or even pull a vacuum. So I bought a new one and tested it and it was the
Any ideas what the problem might be?
Could the catalytic converter really clean up that high of NOX?
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