Quote:
Originally Posted by ronald7410
15mins 5500rpm! can our cars handle that without overheating?
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Yes it can handle it it, no don't do that. It won't help you pass smog. Your engine is running rich. The most likely culprit is a failed or lazy O2 sensor. Relatively cheap and easy fix.
Quote:
Originally Posted by JohnM.
More holes in the exhaust the better as far as I can see. It's less emissions going into the testing machine!
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The emissions test looks at HC, NO, and CO as a % percent of the total emissions so the hole is irrelevant. If there is O2 leaking into the exhaust (possible between pulses) they will fail you. Thats why the last line in his emissions test is "CO+CO2% 13.1 6.0
min PASS 13.4 6.0
min PASS". This checks for exhaust dilution with outside air.