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Thanks for the tips. I haven't changed the
oil in a while, so will do that. I did put fresh gas & drove for about 20
minutes before going to emmissions. I live in Arizona & it was about 104
when I went. The carb is a brand new Carter that I installed a little over a
year ago.It took me 4 attempts at adjusting last year before it finally
passed.
They put the car
on a dyno & test HC & CO both at idle & under load. The readings I
got were;
HC
Loaded
Standard
Result
Idle Standard
Result
199
450
Pass 166
450 Pass
CO
Loaded
Standard
Result
Idle Standard
Result
4.98
3.75
Fail
1.21
5.00
Pass
Since last year, I've readjusted the air
idle mixture, so will look at that again & also replace the air
filter. The plugs are Autolite #85 with 500-600 miles on
them.
----- Original Message -----
Sent: Wednesday, June 28, 2006 9:29
AM
Subject: Re: IML: 69 Imperial Failed
Emissions
Something that I do for emissions tests is to do an oil change immediately
before the test (the same day). I do not know if this is an old wives
tale, but it has served me well on many emissions tests. I guess the idea is
to not have any crap in your oil at all which could effect the emissions.
This is probably also a good opportunity for a complete tune up as posted
below. I am a big believer in electronic ignitions and high voltage
coils. I have an Mopar distrubitor/Orange ECU/MSD Blaster II coil on my
1969 LeBaron, but previously ran a Pertronix I/stock coil on a 1966 383
Newport with great success. The Pertronix unit is relatively cheap (ca $75)
and almost undetectable, simply replacing the points and requiring a power
lead. After installing the Pertronix I did not touch the ignition on the
vehicle for 10 years, at which point I got rid of it.
-----
Original Message -----
From: "Christopher H"
To: "IML (main)"
Subject: Re: IML: 69 Imperial Failed
Emissions
Date: Wed, 28 Jun 2006 00:01:53 -0700
High CO tends
to come from an overly rich air-fuel mixture and/or
unburned
fuel.
I don't know the state of tune of your car or the
last time the carb was
rebuilt, but if it's dumping in too much fuel or
not using it up, you should
be able to get the car to pass by addressing
one or both of those. Start
with the easy stuff: fresh spark plugs
(Autolite #85), properly set timing,
a fresh oil change, tank of gas and
air filter. After that, consider a carb
rebuild, new plug wires and/or
even a new ignition coil, as a weak spark
will result in poor
combustion.
One thing I always make sure of before a smog check is to
drive the car for
a good half-hour on the freeway, with a few good
sprints for good luck.
Often an under-warmed-up engine will register high
hydrocarbon levels rather
than high CO, but high HC is also a result of
unburned fuel (or in the case
of newer cars, a catalytic converter not
yet fully warmed up, not an issue
with your '69).
What state do
you live in, and what kind of emissions testing do they do?
(In CA, the
car goes onto a dyno and they test at 15 mph and 25 mph, so it's
a pretty
grueling, or at least revealing, test.) 3.75% CO is a very high
standard
(meaning not stringent). Also, what's the odometer mileage on
your
car?
Here are the results of the last time I had my '78 NYB
smogged. Granted,
it's a 17,000-mile car with a Electronic Lean Burn and
a catalyst, but note
the maximum allowable levels and how far my car
comes from it, since this
engine was not originally available in CA
because it failed to meet emission
standards. I offer this only as
encouragement that a proper state of tune
can help a lot, even on a car
that's obviously only driven very
occasionally.
------
All
numbers are listed as MAX / AVG / MEAS, where:
- MAX = the legal maximum
allowed before the car fails
- AVG = the average figures for all passing
vehicles
- MEAS = my car's readings
15 mph MAX / AVG /
MEAS
------ -------------------
HC (ppm): 175 / 47 / 33
CO (%):
1.17 / 0.20 / 0.13
NO (ppm): 1215 / 554 /
492
-----------------------------
25 mph
------
-------------------
HC (ppm): 142 / 37 / 43
CO (%): 0.97 / 0.17 /
0.12
NO (ppm): 1075 / 468 /
468
-----------------------------
Hope this was helpful. Let us
know what you do and how much it helps!
Chris in LA
67 Crown
(125,000 miles, and always passed when it had to be tested)
78 NYB Salon
(just a 17,000-mile baby)
On 6/27/06 10:53 PM, john sadowski at
jsadowski@xxxxxxx wrote:
> Well, Its that time again. I had to go
through emmissions 4 times last year
> before finally passing. I went
today & it failed the carbon monoxide test
> under load. The
standard is 3.75 & it went through at 4.98. The other 3
> tests
passed by a very comfortable margin. They were supposed to be
>
exempting collector cars here, but the law has yet to take affect &
they
> don't know if it will. I've been driving the 69 occassionally
now & it runs
> pretty well. I was surprised that it didn't
pass.
> John
>
>
>
>
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This message was sent to
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