From: Rastamon on
I changed the oil and air filter, and it passed. Though I'm curious why the
NO went up almost to the max.

State Emission Standards:

15 MPH - HC (PPM): 146 Max / 43 Ave CO(%): 1.04 Max / 0.16 Ave NO
(PPM): 1136 Max / 406 Ave
25 MPH - HC (PPM): 118 Max / 32 Ave CO(%): 1.32 Max / 0.15 Ave NO
(PPM): 1222 Max / 349 Ave

Here are the results before and after:

BEFORE:
15 MPH - HC (PPM): 72 CO(%): 1.20 NO (PPM): 259
25 MPH - HC (PPM): 78 CO(%): 1.24 NO (PPM): 285

AFTER:
15 MPH - HC (PPM): 87 CO(%): 0.38 NO (PPM): 1130 <--- 4 times than
before
25 MPH - HC (PPM): 51 CO(%): 0.14 NO (PPM): 1102 <--- 4 times than
before

It was about a quart low on oil, so a blow-by might have contributed to the
failure on the first test.




From: al on
On Aug 25, 9:25 pm, "Rastamon" <ra...(a)dakine.com.invalid> wrote:
> I changed the oil and air filter, and it passed.  Though I'm curious why the
> NO went up almost to the max.
>
> State Emission Standards:
>
> 15 MPH - HC (PPM): 146 Max / 43 Ave     CO(%): 1.04 Max / 0.16 Ave     NO
> (PPM): 1136 Max / 406 Ave
> 25 MPH - HC (PPM): 118 Max / 32 Ave     CO(%): 1.32 Max / 0.15 Ave     NO
> (PPM): 1222 Max / 349 Ave
>
> Here are the results before and after:
>
> BEFORE:
> 15 MPH - HC (PPM): 72     CO(%): 1.20    NO (PPM): 259
> 25 MPH - HC (PPM): 78     CO(%): 1.24    NO (PPM): 285
>
> AFTER:
> 15 MPH - HC (PPM): 87     CO(%): 0.38    NO (PPM): 1130 <--- 4 times than
> before
> 25 MPH - HC (PPM): 51     CO(%): 0.14    NO (PPM): 1102 <--- 4 times than
> before
>
> It was about a quart low on oil, so a blow-by might have contributed to the
> failure on the first test.

The air filter must have been filthy causing a rich mixture and high
CO. High NO means the EGR system is not functioning correctly. Good
luck. Al
From: clare on
On Wed, 26 Aug 2009 15:37:53 -0700 (PDT), al <abuonag(a)msn.com> wrote:

>On Aug 25, 9:25 pm, "Rastamon" <ra...(a)dakine.com.invalid> wrote:
>> I changed the oil and air filter, and it passed.  Though I'm curious why the
>> NO went up almost to the max.
>>
>> State Emission Standards:
>>
>> 15 MPH - HC (PPM): 146 Max / 43 Ave     CO(%): 1.04 Max / 0.16 Ave     NO
>> (PPM): 1136 Max / 406 Ave
>> 25 MPH - HC (PPM): 118 Max / 32 Ave     CO(%): 1.32 Max / 0.15 Ave     NO
>> (PPM): 1222 Max / 349 Ave
>>
>> Here are the results before and after:
>>
>> BEFORE:
>> 15 MPH - HC (PPM): 72     CO(%): 1.20    NO (PPM): 259
>> 25 MPH - HC (PPM): 78     CO(%): 1.24    NO (PPM): 285
>>
>> AFTER:
>> 15 MPH - HC (PPM): 87     CO(%): 0.38    NO (PPM): 1130 <--- 4 times than
>> before
>> 25 MPH - HC (PPM): 51     CO(%): 0.14    NO (PPM): 1102 <--- 4 times than
>> before
>>
>> It was about a quart low on oil, so a blow-by might have contributed to the
>> failure on the first test.
>
>The air filter must have been filthy causing a rich mixture and high
>CO. High NO means the EGR system is not functioning correctly. Good
>luck. Al
More likely the oil was diluted with gasoline and/or breaking down.
Half the vehicles that have a marginal fail would pass if the owner
was smart enough to change the oil before taking it in.

Nox can fail one day and pass the next if temperatures change (drop) 5
degrees or so.
Can pass one day and fail the next if temps go up.
The testing station is supposed to run a big fan pointed at the car
when it's hot out. Failure to do so can cause a lot of false fails.
From: Rastamon on

<clare(a)snyder.on.ca> wrote in message
news:g7nb95hkhtnvcav6a5fa8bt5c1bfr15tdv(a)4ax.com...
> On Wed, 26 Aug 2009 15:37:53 -0700 (PDT), al <abuonag(a)msn.com> wrote:
>
>>On Aug 25, 9:25 pm, "Rastamon" <ra...(a)dakine.com.invalid> wrote:
>>> I changed the oil and air filter, and it passed. Though I'm curious why
>>> the
>>> NO went up almost to the max.
>>>
>>> State Emission Standards:
>>>
>>> 15 MPH - HC (PPM): 146 Max / 43 Ave CO(%): 1.04 Max / 0.16 Ave NO
>>> (PPM): 1136 Max / 406 Ave
>>> 25 MPH - HC (PPM): 118 Max / 32 Ave CO(%): 1.32 Max / 0.15 Ave NO
>>> (PPM): 1222 Max / 349 Ave
>>>
>>> Here are the results before and after:
>>>
>>> BEFORE:
>>> 15 MPH - HC (PPM): 72 CO(%): 1.20 NO (PPM): 259
>>> 25 MPH - HC (PPM): 78 CO(%): 1.24 NO (PPM): 285
>>>
>>> AFTER:
>>> 15 MPH - HC (PPM): 87 CO(%): 0.38 NO (PPM): 1130 <--- 4 times than
>>> before
>>> 25 MPH - HC (PPM): 51 CO(%): 0.14 NO (PPM): 1102 <--- 4 times than
>>> before
>>>
>>> It was about a quart low on oil, so a blow-by might have contributed to
>>> the
>>> failure on the first test.
>>
>>The air filter must have been filthy causing a rich mixture and high
>>CO. High NO means the EGR system is not functioning correctly. Good
>>luck. Al
> More likely the oil was diluted with gasoline and/or breaking down.
> Half the vehicles that have a marginal fail would pass if the owner
> was smart enough to change the oil before taking it in.
>
> Nox can fail one day and pass the next if temperatures change (drop) 5
> degrees or so.
> Can pass one day and fail the next if temps go up.
> The testing station is supposed to run a big fan pointed at the car
> when it's hot out. Failure to do so can cause a lot of false fails.

It was cool the day I ran the first test, about mid 80s. Then I got an oil
change and a week later, it was more than 90F and there was a fire near by.
Like I said, I don't use this truck much unless I have a HomeDepot run. One
guy told me a lot of RV motorhomes fail because they still for long periods
and don't get oil changes. I guess I'll change the oil, more often, even
though it's not that dark.