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could possibly be a blown head gasket waiting for the right time hit u...is your radiator spitting water into your reservoir after a good amount of time driving?? thats what happened the first few times i experience a BHG not possible that its a valve steam seal cus thatll cause black smoke...

found out what was the reason why my supra was spittin out code 21....i did a test to see if the o2 was getting any power at the ecu and sure enough it was so it boiled down to the o2 heat wire. i rechecked and traced it as far as a foot from where the o2 plugs into and found that my wire was...

i have been trying to sort this code out as well... i was wonderin if u figured it out yet??? please keep us updated i to need to sort this code out... ive taken off my whole harness to check all the wires and they all checked out good but the one thing i havent done is changing out the ecu

im also experiencing this exact problem after i did my rebuild....crazy thing about this is that before the rebuild the car ran perfectly fine...i mean no check engine no misfiring... its runs now but with a code 21 did a O2 change but the code still remains up

entertained here.....gives me a laugh......keep up the work with finding every little detail to jump on LOL

not sure what ur talkin about but im sure when air gets pushed into the engine bay from driving having a place for the heat to escape out of would help keep things a little cooler...worked for me and notice that my car seems to run a little cooler cus the temp gauge is slightly lower than usual.

a lot of switching not much work but the fact of switching a t-stat back and forth every time the season changes is pointless. if you want your engine to be cooler jus add some washers to you hood hinges or remove the back seal on the hood and let the hot heat escape out from your engine bay...