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Old May 11th 07, 11:00 PM posted to rec.autos.tech
Blake
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Posts: 10
Default Failed Smog - Any Clue in the Numbers?

Thanks for the tips. This was very helpful.

After reading them, I did some checking. The bottom line (so far) is that
the engine idles normally with the EGR valve removed and a big gaping hole
in the intake. I suppose it must be plugged with carbon.

I can see a couple of knock-out plugs on the EGR passages on the intake
plenum. I guess I'll knock them out and see how much carbon I can clean out.
Beyond that, is there anything else? Any magic solvent that cleans out the
carbon from those hard-to-reach places?





> wrote in message
. ..
>


> High NO should indicate excessive temperature in the combustion chamber,
> which -generically-
> can come from several sources...failure of the EGR system, lean operating
> conditions, spark
> timing off, or other things that would result in high combustion
> temperatures. Lots of things
> can affect this.



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