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Hi everyone! I recently purchased a 95 suburban 1500 5.7 and Im trying to get it to roll through emissions but my idle is still a bit too rich. The limit in our state (NJ) is 220 on low idle HC’s. To make a long story short, It originally blew a 520 for low idle hydrocarbons -high idle passed with flying colors. I Have it down to a 277 but thats still not enough to pass. The truck did have a miss but i was able to fix that. I have replaced plugs/cap/rotor, egr valve, egr vac switch, new vac lines, idle air control valve, and put the “correct” thermostat in it (195). The timing was also 8 degrees advanced- so i bumped it back to 0 which is factory spec. I am running premium fuel, there are no vac leaks, and no codes. The truck is running awesome, just not awesome enough to pass emissions. My next replacement will be the o2 sensor even though it is showing good on the scanner- I have seen some be “lazy” in the past.
Some friends have suggested a fuel additive called “guaranteed to pass” – I think its made by CRC. I’ve seen other things out there like seafoam and marvels, etc..Has anyone tried this stuff? does it work? I would rather fix it the old fashioned way / the right way, but im running out of my 45 day failed inspection time limit.
Thanks!
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