Quote:
Originally Posted by drift freaq
you don't need seafoam. What you do need to do, is open your intake at the throttle body and spray carburetor cleaner in as it runs. This will clean out your whole emission setup. Next thing is check your timing and make sure its correct and even retard it some.Replace spark plugs, cap and rotor, if need be. Also make sure your EGR valve is functioning. You can do this by holding your finger on the underside and revving the engine. If it works it the diaphragm will pull up. Also definitely get a good cat and run the engine at 2800 rpm for like 10 mins straight prior to putting it on the rollers to heat the cat up.
If your o2 sensor was bad you would be throwing a code.
I just took in a a higher mileage 89 that had failed and gross polluted 3 years ago and sat since then. I got it to pass flying colors running real clean. I pretty much did all of the above to do it.
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aw man, i tried this method, i was hoping it worked, but i guess i must've done something wrong, just got back from the smog station, this is my second time already and i failed again. the first time my Nox was just too high, failed 15mph by like 750 and failed the 25mph by like 350. my car is a 95 s14 with about 104k miles, and it's bone stock. this time i don't know what numbers i got though, cuz the smog guy didn't give me my paper. i thought he was suppose to give it to me, but since he didn't charge me for it, i guess he didn't want me to show it to you guys, lol. probably knew i was going to ask you guys for help. i give up, imma just let him do it now. when i failed the first time i check the egr, the diaphram lifted, it seemed ok, check the bpt, it seemed fine too, checked all the lines, they seem good, actually got the egr canister control valve out and checked it, it worked too. so im stuck, and frustrated.