[Shop-talk] High Hydrocarbons

[eric at megageek.com]

Is there a way to test O2 sensors?  I'm guessing the cat isn't poisoned 
since it doesn't smell.  How do I check a crankcase rebreather?  This is a 
91, so there is no OBD II Connector.

Eric P
"Be as beneficent as the sun or the sea, but if your rights as a rational 
being are trenched on, die on the first inch of your territory." Ralph 
Waldo Emerson 




Peter Murray <peterwmurray at gmail.com> 
08/26/2013 08:19 PM

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eric at megageek.com
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shop-talk at autox.team.net
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Re: [Shop-talk] High Hydrocarbons






Is the crankcase rebreather working? What about the catalytic converter? 
Oxygen sensors?
-Peter
On Aug 26, 2013 8:29 PM, <eric at megageek.com> wrote:
OK, if you remember, I asked about a 1991 2500 Chevy pick up that had been
sitting for 5 years.

We got it running, and it failed inspection for hydrocarbons being too
high (they were 466 and max allowed was 220ppm)
The CO%  was very low (.68)

So, I checked all the vacuums and they were good.  I changed the wires,
plugs, rotor, distributor cap, and air cleaner.

After that, the HC were dropped to 240ppm (20 points too high.)  The CO%
went up to .94  (still under the max of 1.20.)

So, I'm guessing that I can get it down with an additive or running really
hot (or cold.)

What is the collective wisdom of what I can do next to get the last 20
points?  Free is best.

Thanks in advance!


Eric P
"Be as beneficent as the sun or the sea, but if your rights as a rational
being are trenched on, die on the first inch of your territory." Ralph
Waldo Emerson
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