Toyota MR2 Message Board - View Single Post - Help - failed smog test

87mk1gold · 08-04-2009, 02:16 PM

Passed every part but the oxides of nitrogen was just over the limit. The rest was well within limits. The engine runs so great it is hard to believe there is anything major wrong. Pulls hard all the way to redline, so I wouldn't think there is a fuel supply shortage.

I checked all the cooling fans, the timing, and the egr function. All seems to be good. The engine has a lot of miles on it, so it could be carboned up, but what could I do about that?

Only thing I can think of is the catalytic converter. It is a three way so it is supposed to control Nox as well, but replacing it isn't cheap, and I'm not convinced that's the problem. The other tested values were good.

What else is there?

08-04-2009, 02:16 PM	#1 (permalink)
87mk1gold Ex Cortina Driver Join Date: Jan 2008 Posts: 9 Thanks: 0 Thanked 1 Time in 1 Post iTrader Rating: (0/0% )	Help - failed smog test - Nox too high Passed every part but the oxides of nitrogen was just over the limit. The rest was well within limits. The engine runs so great it is hard to believe there is anything major wrong. Pulls hard all the way to redline, so I wouldn't think there is a fuel supply shortage. I checked all the cooling fans, the timing, and the egr function. All seems to be good. The engine has a lot of miles on it, so it could be carboned up, but what could I do about that? Only thing I can think of is the catalytic converter. It is a three way so it is supposed to control Nox as well, but replacing it isn't cheap, and I'm not convinced that's the problem. The other tested values were good. What else is there?