4xcrazy
3/4 ton status
ya know what's funny, is i thought of you when i posted that comment
figured you'd post up and say something
CK5
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cutting open the cat, taking out whats inside
- Thread starter 84CUCV
- Start date
ya know what's funny, is i thought of you when i posted that comment
figured you'd post up and say something
The allowable pollutant numbers are different based on make, model, and year of vehicle. On a carbureted truck (like one that only had EGR and a cat as its original emissions equipment), the test pass/fail HC, CO and NO numbers are pretty generous. Depending on what state/locality you're in, they may only check at one or a couple RPM settings, and you could tune to run pretty clean at those with no working cat.
On a later-model fuel injected vehicle, the allowable pollutant numbers are MUCH tighter, and you'd likely fail on HC output without a working cat.
On a later-model fuel injected vehicle, the allowable pollutant numbers are MUCH tighter, and you'd likely fail on HC output without a working cat.
4xcrazy
3/4 ton status
1994 Chevy 1/2 ton fuel injected.
of course being a 4.3 is probably helping out alot, but still the fact it passes without the cat working properly,,,
Sometimes the smell of the exhaust (unburnt fuel) will reveal that you are running without the catalyst. So having one is also a kind of courtesy to other drivers. On a vehicle with an O2 sensor after the cat, you will have to run a simulator or change cals to prevent a SES light when there is no cat.
84CUCV
3/4 ton status
didnt pass, buying the 50 dollar one on ebay
Mine passed with flying colors with that cat.
84CUCV
3/4 ton status
its on the way
Just make sure that the engine isn't running excessively rich or burning oil as both of those will kill the CAT in short order.
blackk5350
1/2 ton status
cat? whats a cat?
79bonanza
1/2 ton status
cat? whats a cat?
haha thats what i was thinking, my cats prolly cut off from the factory
gotta love ky vehicle standads
haha thats what i was thinking, my cats prolly cut off from the factory
gotta love ky vehicle standads
IIRC catalytic converters weren't required until '78 if the truck was over 6K GVWR. AFAIK any light duty vehicle, that wasn't a diesel, had cats from '79 on.
79rustyk10
3/4 ton status
both 79 k10's Ive had, have had converters on them from the general
