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Need help with emissions...
- Thread starter Intense-Dakota
- Start date
-
moper
Well-Known Member
On the Holley, stamped into the driver's side front surface, should be something like this: "LIST-1850-x" That's the carb's model or list number. Get that first. Is the carb new? If it's over 2 years old, I would rebuild it with a good kit. I like AED myself. Blow out all the passages, and make sure it's cleaned out. Holleys never idle very clean. They like WOT, not idle. The single plane could be hurting you too. You may try borrowing a Thermoquad that runs well. It's one of the best idling carbs anywhere once they are sety up. Also, what distributors did you put in? factpry rebuilt ones, or a new performance one?
Here is a log of what I went through to get my car passed in Ontario. The car itself is a '87 Diplomat, which means nothing really. It's a 360 with the MP .430"/.450" cam, #302 heads and a TQ. Also had the original catalytic converter on there......which might be a temporary option for you. A temporary bolt in one.
April 1 2005
Well I finally got the declaration from the dealer indicating that I had a "Hot Rod" which allows me to pass emmission to a 1980 standard. Here's my emissions results from today. I knew my TQ was idling way too rich but this was even higher than I thought.
My timing is 15 degrees initial + 20 mechanical at 2000 rpm. You'll notice that the 40kph test was done at only 950 rpm so I'm not making full use of my advance. I think if I advance the timing so that it's 35 at idle, the NO might go up and the CO might come down. The idle results are another matter entirely. Those are HUGE numbers. I've gotta lean that idle circuit out somehow.
40 km/hr (950 rpm)
--------LIMIT-----RESULT
HCppm---242-------218
CO%-----1.92------2.97
NOppm---2520------1194
IDLE (430 rpm)
--------LIMIT-----RESULT
HCppm---300-------1986
CO%-----1.5-------7.56
NOppm---n/a
April 4 2005
Went for emissions again today.
I looked at my results from yesterday and realized that if I could just get them to test mu idle at 950, my idle result swould be pretty close.
So I increased the timing from 15* to 25*. This had the effect of increasing idle speed to approx 600 rpm. I wanted to get it to an "idle" test rpm of 900 so I screwed in the idle stop until the tach read 900.
Today's idle results are much better.
40 km/hr (950 rpm)
--------LIMIT-----RESULT
HCppm---242-------178
CO%-----1.92------3.36
NOppm---2520------1316
IDLE (900 rpm)
--------LIMIT-----RESULT
HCppm---300-------336
CO%-----1.5-------4.69
NOppm---n/a
Tonight I swapped out my 1997 rods (.067" - .045" -.035") for a leaner 1940 rod (.070" - .060" -.045"). Hopefully this will reduce the unburned fuel (HC) and burned fuel (CO) coming out of the tailpipe.
JUNE 2 2005
I PASSED EMISSIONS!!!!!!!!!!
The trick was to use an exhaust gas analyzer machine to tune the carb until there were acceptable levels coming out the pipe. Then we hooked it up to the emissions test machine (which is just a exhaust gas analyzer) and took the test. That's the final test for this '87. My next test will be due in Feb of 2008 and by then she will be 21 years old and therefore exempt.
Glad to get this out of the way.....without using methyl hydrate. Well, I guess I sorta cheated by utilizing the hot rod clause.
40 km/hr (1634 rpm in 2nd gear)
--------LIMIT-----RESULT
HCppm---242-------100
CO%-----1.92------1.29
NOppm---2520------1634
IDLE (900 rpm)
--------LIMIT-----RESULT
HCppm---300-------109
CO%-----1.5-------.76
NOppm---n/a
April 1 2005
Well I finally got the declaration from the dealer indicating that I had a "Hot Rod" which allows me to pass emmission to a 1980 standard. Here's my emissions results from today. I knew my TQ was idling way too rich but this was even higher than I thought.
My timing is 15 degrees initial + 20 mechanical at 2000 rpm. You'll notice that the 40kph test was done at only 950 rpm so I'm not making full use of my advance. I think if I advance the timing so that it's 35 at idle, the NO might go up and the CO might come down. The idle results are another matter entirely. Those are HUGE numbers. I've gotta lean that idle circuit out somehow.
40 km/hr (950 rpm)
--------LIMIT-----RESULT
HCppm---242-------218
CO%-----1.92------2.97
NOppm---2520------1194
IDLE (430 rpm)
--------LIMIT-----RESULT
HCppm---300-------1986
CO%-----1.5-------7.56
NOppm---n/a
April 4 2005
Went for emissions again today.
I looked at my results from yesterday and realized that if I could just get them to test mu idle at 950, my idle result swould be pretty close.
So I increased the timing from 15* to 25*. This had the effect of increasing idle speed to approx 600 rpm. I wanted to get it to an "idle" test rpm of 900 so I screwed in the idle stop until the tach read 900.
Today's idle results are much better.
40 km/hr (950 rpm)
--------LIMIT-----RESULT
HCppm---242-------178
CO%-----1.92------3.36
NOppm---2520------1316
IDLE (900 rpm)
--------LIMIT-----RESULT
HCppm---300-------336
CO%-----1.5-------4.69
NOppm---n/a
Tonight I swapped out my 1997 rods (.067" - .045" -.035") for a leaner 1940 rod (.070" - .060" -.045"). Hopefully this will reduce the unburned fuel (HC) and burned fuel (CO) coming out of the tailpipe.
JUNE 2 2005
I PASSED EMISSIONS!!!!!!!!!!
The trick was to use an exhaust gas analyzer machine to tune the carb until there were acceptable levels coming out the pipe. Then we hooked it up to the emissions test machine (which is just a exhaust gas analyzer) and took the test. That's the final test for this '87. My next test will be due in Feb of 2008 and by then she will be 21 years old and therefore exempt.
Glad to get this out of the way.....without using methyl hydrate. Well, I guess I sorta cheated by utilizing the hot rod clause.
40 km/hr (1634 rpm in 2nd gear)
--------LIMIT-----RESULT
HCppm---242-------100
CO%-----1.92------1.29
NOppm---2520------1634
IDLE (900 rpm)
--------LIMIT-----RESULT
HCppm---300-------109
CO%-----1.5-------.76
NOppm---n/a
Rick 5150 69
Well-Known Member
Has anybody caught this Intense Dakota writes; I am going to tear down the carb this weekend and find out what jets are in it becuase the car came from Colorado and I am in Illinois. Sense most sea level 1850`s came with 72/76 jets, its probably lean, it was more than likely jetted down for the mile high city....? what do you guys think...? Also may even have the wrong power valve?
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