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Investigative Tinkerer
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5,011 Posts
Smog test = no

Repair shop not properly bleeding the air out of the cooling system = possible

Rule of thumb for tailpipe smoke:
blue = burning oil
black = excessively rich (fuel)
white = steam (water)
darker white = brake fluid (failed brake booster allowing fluid to be sucked into intake tract__burns exhaust valves too!)
no visible smoke, but exhaust fumes burns eyes = too lean__waaay too lean!
 
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