3000 GT VR-4 Need some emissions help please

Joepro

On the older hondas that would not pass a good tune up always got them to pass, new cap rotor wires and plugs. I would also seafoam it, maybe twice, one can in the tank the other through the intake, it will help.

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DEpointfive0

Not sure if that's anecdotal or not because OP has a Mitsubishi.

OP, try Seafoam in the intake and gas, also, try a bottle of that Guartanteed to Pass crap they sell at VatoZone for $20. My friend's POS Miata went from failing really badly to passing within 1 percent of the failure mark.
Just make sure you get the car running and hot as all hell before you take it in


The other thing... You're not in CA, so honestly, I'd buy a cheap 49 state approved cat and slap it on. Parts are probably $80, labor probably another $20-30 to weld it in, and you can sell the old cat for some money on craigslist

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Rangerz

Good suggestions. He did the autozone pass and had maginal improvment but, still a failure. I'll try the seafoam and see where we are at. I know jack shiet about how far/ bad his original test was off othe than the difference in the numbers. I guess the issue is I'm not sure what to expect with changing things out.

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