Question about 1984 Ford F 150

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6 cyl engine runs on a bit after shutoff cat. converter has been replaced with straight pipe

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Posted on May 08, 2010


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depending on the engine make
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HO2S( heated sensor) are before the cat convertor either in the manifold or exhaust pipe to the cat converter
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Plugged catalytic converters are very rare in newer vehicles, the old bedded cats did this that GM used but not the new ceramic grid cats unless the exhaust got cherry red from excess fuel or extreme overloading of the vehicle. The two things you need to do a re this run a fault code test then check the fuel pressure if no codes show up other than a lean code, if all is well have a exhaust back pressure test run.

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Details are here, from p 158

The same for the V6 engine is eg2.pdf

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