Smokin' 96 4-Runner V6 4x4

[jherentals]

Hi, I know that excessive black smoke means the car runs too rich. The O2 sensors are a non-issue, and the smoking is a bit different. My 96 4Runner V6 starts and runs great, no smoke etc. But after driving it a while, in 100 degree August heat in particular, and when it idles a while , it suddenly starts billowing black/grey smoke. It's not pure black but not white either, I'd say a dark grey smoke. After driving a while, it normally corrects itself, but comes back intermittently. The SUV "runs" great, even when smoking, but I know the smoke is bad and indicative of a problem. The only info from the check engine light is "system lean bank 1". One other "clue" is that the TRD Supercharger (big mistake) was put on a few months ago. Runs pretty strong but has the typical probs that make you have to run out and shell out for the "URD upgrade" (jeeez...what a nightmare). The symptoms tying into the URD "upgrade" are intermittent ping on heavier acceleration (seldom done at $3.30 a gallon for "premium" gas) and some other drivability issues w/ the supercharger. I am tempted to rip the supercharger out and go back to the old fashioned intake manifold, but I am concerned about the smoking problem remaining. Anyway, my concern is the smoking exhaust and not the drivability with the TRD supercharger. I can fix the supercharger prob either with URD 's product or ripping the supercharger out.........again "it's all about the smoking". Any feedback, esp from anyone who's experienced this AND TRD probs, is much, much appreciated. Thanks ! :) Jim Kansas City