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I have a similar problem (without the smoke), and I just found out that theres a problem with my Evaporative Emission Control System (EECS). I did the same as you, Cleaned EGR, Replaced TPS - and still the same problem. If you look on top of the throttle body, theres a black vacuum connector with 2 or 3 hoses that run behind and under the intake manifold (2 on mine, 97 sl1). If you pry that off, place your finger over the holes on the Throttle body, and I imagine your car would start fine (like mine) and idle normally. If this is the case, there is a problem with the Purge Control Solenoid...it dosent hold a vacuum. According to the haynes manual "It doesnt hold a vacuum and needs to be replaced." I just need to figure out how to replace it now...since its under the intake manifold its really hard to get to.

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Q: 98 Saturn sl1 revs 3500rpm at startup starts to smoke then idles back to normal smoke clears egr cleaned tps replaced this helped 2 days but started once again still no codes any suggestios?
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