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#### slotracer

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1983 chevy s-10 2.8 v6 engine. @ 15 mph, 1569 rpm my HC is 158 max is 206. @ 25 mph, 1601 rpm it is 119 max is 124. it passed this time but with the numbers being what they are i wonder if i will pass next time? why would the numbers be what they are?

#### HALLETT BOY

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You're lucky they are that low ...count your blessings

#### mjc

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549 Posts
Put a new cat in before the next test

#### dribble

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844 Posts
Post the O2 the CO the Nox and the the A/F ratio can be computed using the Lambda Calculator. Could be something as simple as a vacuum leak. The vehicle could blow those numbers with a weak CAT but the CO and Nox should also be a little high. Also on a vehicle that old the cause could be engine blow-by and/or compression.

#### slotracer

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new engine,
CO2 @1569=14.60, @1601=14.60
02 @1569 = 0.56, @1601 = 0.53
CO @1569 rpm = 0.14, @1601 = 0.11
NO @1569 = 681, @1601=483
truck has been sitting awhile but fresh gas when tested

#### IMPATIENT 1

· mo balls than \$cents\$
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i have a uncle in dallas that couldn't pass smog, i had him fill his tank 1/4 full with e85 and the rest unleaded, it passed with flyin colors

#### dribble

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844 Posts
new engine,
CO2 @1569=14.60, @1601=14.60
02 @1569 = 0.56, @1601 = 0.53
CO @1569 rpm = 0.14, @1601 = 0.11
NO @1569 = 681, @1601=483
truck has been sitting awhile but fresh gas when tested
A/F ratio is only slightly lean (14.94) 14.7 is desired but this is still within tolerance. Cat is most likely good. Next test I would make sure there are no vacuum leaks and it has a fresh fuel filter.

#### slotracer

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it runs good, just seems a little slugish when taking off from a stop, like its lacking on fuel.

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