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Re: Emissions
Posted by eshghi (more from eshghi) on Wed, 15 Dec 1999 08:45:30
In Reply to: Emissions, Jack Brooks, Tue, 14 Dec 1999 09:21:52
> OK, so if my 1988, 9000S had 92-Hydrocarbons and 0.49-CO, what is the
> results telling me about the condition of my engine? What would cause these
> numbers to climb to these levels?
Gee, it could be almost anything. The B.C. Motor Vehicles people list
the following (although I think most of the items on these lists would
trigger your Check Engine light, so if that isn't happening, you can
narrow things down, quite significantly):
high HC at idle:
- vacuum leaks
- incorrect ignition timing and/or idle speed
- incorrect carburetor air/fuel mixture
- ignition system malfunction
- faulty computer control(s)
- air injection system failure
- improper fuel injector operation
- internal engine problem
- O2 sensor malfunction
high CO at idle:
- carburetor air/fuel mixture maladjusted
- dirty air cleaner, faulty choke or carburetor
- carburetor float level maladjusted
- faulty computer control(s)
- air injection system failure
- malfunctioning fuel injection system
- inoperative/missing catalytic converter
- O2 sensor malfunction
high HC on driving test:
- vacuum leaks
- ignition system malfunction
- faulty on-board computer control(s)
- faulty air injection system
- internal engine problem
- O2 sensor malfunction
high CO on driving test:
- air cleaner, choke or carburetor malfunction
- fuel injector(s) dirty or sticking
- faulty computer control(s)
- air injection system failure
- defective canister purge system
- inoperative/missing catalytic converter
- O2 sensor malfunction
high NOx on driving test:
- inoperative/ineffective EGR system
- malfunctioning or missing catalytic converter
- excessive spark advance
- faulty thermostatic air cleaner system
- engine deposits or mechanical defect
- excessively lean air/fuel ratio
- O2 sensor malfunction
Artemis scored better this year than she had last year, and I think it
was because I had the fuel tank replaced between the two tests. (My
fuel tank had melted. Otherwise, I would have just had the old tank
flushed rather than replacing it.) High road test-passing tactics are
filling up with high octane fuel and changing the air filter. Low road
strategies are taking out the air filter, altogether, and over-filling
tyres. Be sure to give your engine a good work-out, before the test,
and give it a little rev up, right before, especially if you've been
sitting in queue, a while (good to get some [theoretically] fresh air
through).
Good luck!
Roxi
Posts in this Thread:
- Emissions, Jack Brooks, Tue, 14 Dec 1999 09:21:52
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