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4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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Old 07-01-2011
Turbo Roadster's Avatar
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Smog Test

Question for anyone had the truck smogged today only thing that registered was CO2 @ 14.8 ppm everything else was 0.0 O2, HC, CO and NO. Is this normal Truck is a 2001 4.0 auto

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Old 07-02-2011
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These trucks have a massive overkill of cats and that might explain it. They have 2 mini cats after each manifold followed up by two more main cats. With 4 catalytic converters a car ought to be clean.
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Old 07-02-2011
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I have removed my large cat and one pre cat. I passed emissions and the tail pipe stiffer
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