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> OBD II on a 94 st?, its got 2 oxygen senesors?
post Mar 12, 2004 - 1:55 PM
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RoverGuy

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so i have a 94 celica st and it has 2 o2 sensors? wtf? it cant be OBD II b/c its speed density and not hot wire Mass Air Flow Meter...plus OBD II wasnt around until 96? can anyone help me? please...i want to put my header on. smile.gif torrey
 
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post Mar 12, 2004 - 8:09 PM
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SpedToe169



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the o2 sensers on the exhaust manifold are the air fuel ratios mixtures the top senser measrues the how rich or lean the mixtures then sends the info to the ECU then adjusts the ratio to have perfect combustion the bottem one makes sure the mixture perfect.



Where the hell did you hear this? Totally, absolutely incorrect.

The '94 is not an OBDII car. It will run just fine with no O2 sensors plugged in. Try it sometime. It doesn't even trigger a CEL under any conditions I've tried.

Even OBDII cars don't run in closed loop under WOT. They only use the O2 sensor at idle and cruise.

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