'93 Geo Prizm (Toyota 1.6l) emissions... High NOx and EGR valve?

This car failed emissions for high nitrous oxides. Limit was ~1300 and it was puting out ~1400. I was thinking it may be the EGR valve, but I can not find the EGR valve on this car. I'm beginning to wonder if it even has an EGR valve. I can not find anything even remotely resembling an EGR valve near the throttle body, or anywhere on the intake. From waht I can see below the intake there is no EGR valve down there either. I also can't find any exhaust pipe from the manifold or even farther down from the exhaust pipe. Nothing that would lead to an EGR. Now I can't see everything down there around the exhaust and I can't see everything behind the engine, so it may yet have an EGR valve. Anyhow, if anyone knows whether it has an EGR valve and if it does, where it is, I'd really appreciate the information. I kinda think it must have one as the parts stores list an EGR valve for it and can order it.

If it's not that then I'm thinking it may be the catalytic converter. If that's the case maybe I'll just try retarding the timing a bit and see if that gets it to pass. I'm not gonna be keeping the car too much longer. Since it's only 100 over maybe the retarded timing will be enough. Just want it to pass to last a while longer.

Cory

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Cory Dunkle
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