RE: [alfa] emissions once again

["Peter Webb" <webb.p@xxxxxxxxxxx>]

> With all the talk and expertise on emissions testing, I thought I
> would pose
> my own question.  In Texas the test is run at 15mph and 25 mph.
> In my case
> low speed resulted in 1887 rpm and high speed in 2030 rpm.  My
> car barely passed
> HC's on the low speed test by 1ppm last March.  This means it
> showed 193ppm
> with a standard of 194 ppm for HC's.  CO% and Nox(ppm) passed
> just fine.  Can
> anyone tell me why HC's are high and what I might have to do next
> month to
> pass?  This car just needs to pass one more time.  Yes, I believe
> the cat is
> original, with 177,000 miles.  Also, on the high speed test, HC's
> passed with 163
> ppm with a standard of 189 ppm.  This car has Bosch KIS injection, four
> cylinders, and a five speed transmission.

Year of the car would help.   You car probably has Bosch L-Jetronic.  K-Jet
was never used on any Alfa.   You need to buy a Saab or Volvo for that ;).
If it's not electronic, it's a Spica system similar to CIS but not really.
If it's post 1991, it's Motronic ML4.1.

High HC indicates running rich.   Possible causes (assuming EFI):

Bad O2 sensor
Thermostat stuck open/missing
Coolant temp sensor stuck/broken/unplugged (also check connector corrosion)
Fouled plugs
Weak spark (check/replace all ignition components)

Give those things a look.  Email the list or me directly with what you find.

-Peter
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