Dave,
I would assume its not the catalytic converter because the CO's are good.
Usually if
A converter is not working you will show high very CO's.
NOx is high I would more than likely say that there is a very high amount of
carbon
buildup in the system. I assume that this is a carburated and not a throttle
body?
A good way to decarbon the system is to take a fuel injection cleaner, or some
isopropal alchohol and run it thru the major vaccum line, like off the brake
booster
and give vehicle about 3000 rpm and poor slowly thru the vaccum system this is a
good way to clean soom of the carbon from the system.
Make sure the oil is changed, and vehicle is warmed up before you go and give
that a
try.
Jonathan
Dave Dahlgren wrote:
> My daughter has acquired a classic , sort of, an '88 Chevy Celebrity with a
>2.5
> liter 4 cylinder. If any one has pounded on one to fix the things that seem to
> fall off I have 2 problems with it. First seemingly simple thing is the horn.
>No
> fuse that i could see and I could not find the horn relay to save myself.
>Where
> the heck is it? I assume it is the relay that is bad or a fuse as i took the
> steering wheel trim ring off and grounded the wire used to fire the relay with
> no luck and did not think both horns could be bad. Second it did not pass
> emissions. The HC was good and the CO was good too but the NOX was 3000 ppm
>out
> of 1258 allowed. So I changed the O2 sensor that sure looked trashed and the
>air
> filter soaked in goo, added 2 cans of dry gas, injector cleaner and did a
> decarbon job with some water down the throttle body at a fast idle. results
>were
> HC still good but actually 10 points higher, CO still good and about the same
> and NOX down to 2080 from 3000 but still not ok. I have checked the EGR with a
> hand held pump and no matter how fast I pump it won't hold a vacuum with the
> engine running but if i pump fast the idle speeds up a tiny bit. So is it the
> EGR or the catalytic converter????? This thing is a beast and I hate to put
> money into it that is not necessary it does have 118,000 miles on it. Oh one
> other thing it has DIS so you can't change the timing and all the hoses look
>ok
> and are hooked up to the correct places. And in fact it seems to run ok and
> drive well.
> Dave Dahlgren
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