Failed Smog 86 22R PU

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Old 20 Aug 2009, 03:37 pm   #1 (permalink)
Rastamon
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Default Failed Smog 86 22R PU

I recently had to get a SMOG test for my 86' 22R PU. It barely failed CO,
by 0.08, from the maximum allowed. Everything else was within normal limits
if not below. I don't use this PU that much, it's my HomeDepot beater. The
last oil change was 6 months ago. I've already replaced the air filter and
the plugs and wires are about 6 months old.

Can just doing an oil change get me below the maximum CO level?


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Old 20 Aug 2009, 04:45 pm   #2 (permalink)
Charly Coughran
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Default Re: Failed Smog 86 22R PU

"Rastamon" <rasta@dakine.com.invalid> wrote in
news:00098c64$0$2373$c3e8da3@news.astraweb.com:

> I recently had to get a SMOG test for my 86' 22R PU. It barely
> failed CO, by 0.08, from the maximum allowed. Everything else was
> within normal limits if not below. I don't use this PU that much,
> it's my HomeDepot beater. The last oil change was 6 months ago.
> I've already replaced the air filter and the plugs and wires are
> about 6 months old.
>
> Can just doing an oil change get me below the maximum CO level?


No, an oil change wont help. CO is produced by incomplete oxidation of
the hydrocarbons in the fuel mixture. If the oxidation was complete
there would only be CO2 in the exhaust. So to reduce CO levels, you
might want to tune the engine up. Did you tune it when you changed the
plugs and wires? The new air filter might help a little if the old one
was limiting air flow; you might try leaving it out for the test if you
can get away with that.

The catalytic converter also lowers CO levels by transforming CO to CO2,
but catalytic converters aren't cheap.


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Charly Coughran
ccoughran@DELETE-TO-RESPOND-UCSD.EDU
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Old 20 Aug 2009, 04:45 pm   #3 (permalink)
al
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Default Re: Failed Smog 86 22R PU

On Aug 20, 4:37*pm, "Rastamon" <ra...@dakine.com.invalid> wrote:
> I recently had to get a SMOG test for my 86' 22R PU. *It barely failed CO,
> by 0.08, from the maximum allowed. *Everything else was within normal limits
> if not below. *I don't use this PU that much, it's my HomeDepot beater.*The
> last oil change was 6 months ago. *I've already replaced the air filterand
> the plugs and wires are about 6 months old.
>
> Can just doing an oil change get me below the maximum CO level?


High CO means it is running too rich. Did the old plugs look carbon
fouled? Many things can cause it to run rich. Is it running too
cool, is the carburator choke sticking closed? Those are the first
things to eliminate. Good luck. Al
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Old 25 Aug 2009, 08:25 pm   #4 (permalink)
Rastamon
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Default Re: Failed Smog 86 22R PU UPDATE

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.




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Old 26 Aug 2009, 05:37 pm   #5 (permalink)
al
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Default Re: Failed Smog 86 22R PU UPDATE

On Aug 25, 9:25*pm, "Rastamon" <ra...@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
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Old 26 Aug 2009, 08:13 pm   #6 (permalink)
clare@snyder.on.ca
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Default Re: Failed Smog 86 22R PU UPDATE

On Wed, 26 Aug 2009 15:37:53 -0700 (PDT), al <abuonag@msn.com> wrote:

>On Aug 25, 9:25*pm, "Rastamon" <ra...@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.
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Old 27 Aug 2009, 04:19 am   #7 (permalink)
Rastamon
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Default Re: Failed Smog 86 22R PU UPDATE


<clare@snyder.on.ca> wrote in message
news:g7nb95hkhtnvcav6a5fa8bt5c1bfr15tdv@4ax.com...
> On Wed, 26 Aug 2009 15:37:53 -0700 (PDT), al <abuonag@msn.com> wrote:
>
>>On Aug 25, 9:25 pm, "Rastamon" <ra...@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.


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