LT1-LT4 Modifications 1993-97 Gen II Small Block V8

cc503 tune

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Old May 24, 2017 | 04:38 PM
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Default cc503 tune

Went to get my emissions tested today, the car has run pig rich since doing cam and exhaust, i just didn't know how rich. It failed miserably at 10x the limit for hydrocarbons. I'm not sure if it's my tune or a leak somewhere.

Does someone have a tune for their 503 that i could look over to see how much mine differs? I'd rather not spend the $300 working on it to get the waiver when i'm guessing it's a wonky tune.

Background: The tune was done by Solomon, but has always been a bit rich, getting worse and worse over time. i went back and forth with him for a while, but he was convinced i had a leak somewhere, which multiple shops told me i didn't.

Someone help a brother out!
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Old May 25, 2017 | 11:03 AM
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your tune could be off for the engine mods you have
you could have a exhaust leak pre-02 causing PCM to dump fuel
you could have a leaking injector dumping fuel

all the above will eventually kill 02 & CAT
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Old May 25, 2017 | 07:58 PM
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Originally Posted by ******
your tune could be off for the engine mods you have
you could have a exhaust leak pre-02 causing PCM to dump fuel
you could have a leaking injector dumping fuel

all the above will eventually kill 02 & CAT
This is why i'm hoping for help looking into the tune, i've had the injectors cleaned and flow tested, and had the exhaust checked twice...
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Old May 25, 2017 | 08:19 PM
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What plugs are you running? What gas are you using?
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Old May 25, 2017 | 10:04 PM
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Originally Posted by joelster
What plugs are you running? What gas are you using?
just the regular TK55's on 91 octane e10 (best we can get here)
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