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I usually turn to BG 44K on smog test runs. My ritual is to run a tank of BG in the car the week or two before, then when that tank is gone, refill a second tank with BG, then take it in for the test after getting the engine really hot.
The last time, it wasn't hot enough outside to get the cat very hot, and the car sat around before the tech could test it. I thought for sure it was going to fail, but it BARELY passed. After making me do the test only smog 4 times in a row, Calilf DMV are finally giving me a break, and letting me do a normal smog test.
Yours is so close, I'd suspect either the cat is too cool or maybe some BG might help. I tried Seafoam too, but it smokes so much, you'd definitely not want any in your gas when you try to get it smogged. It's curious that yours would fail on the low speed run, and pass on the high speed run. My theory is that the cat heated up, and that's what cleaned up the numbers.
What do you mean by Euro? Converted to us smog legal? What equipment is on there now?
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