Cyrille wrote: "I have a question... My car does not pass emissions... I was
wondering, if I change the gas I use, going to an higher octane indices, all
other things staying identical, will my emissions reading change? Will they
get better? Worst? Is it better to go for testing early in the morning, when
it's cold, or later in the afternoon when it is warm?"
Cyrille,
The most efficient your engine combustion will be when everything is nice
and warm... and yes, gas can make a difference... I would make sure your car
does not sit for long before they test it.
1. Did you change spark plugs, air filter, fuel filter, PCV valve and oil?
Checking ignition timing and adjusting the carbs can reduce emissions and
greatly improve your chance of passing, but I assume you have already done
that.
2. Fill up your fuel tank with gasoline that contains 10% ethanol alcohol -
many premium grade fuels use alcohol as an octane booster. The so-called
"reformulated" gasoline formulae contain alcohol or MBTE that adds oxygen to
the fuel, and this reduces carbon monoxide and hydrocarbon emissions.
3. Check the air filter. A dirty filter will increase high hydrocarbon
readings at the tailpipe.
4. Check the PCV valve for deposits and gunk.
A few months ago, I read there was something to put in your gas tank to help
just to get though the test, but I forgot what that "miracle product" was!
JLC
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