unknown things in my exhaust line - Ranger-Forums - The Ultimate Ford Ranger Resource


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

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Old 08-29-2008
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unknown things in my exhaust line

i have a 2002 5speed that looks to have way too many cats in the exhaust pipe. theres one big one thats the farthest back and then 3 smaller looking ones going back into the engine. i have no idea what they are and am interested in redoing my exhaust system soon.
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Old 08-29-2008
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4.0? Sounds normal to me.
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Old 08-29-2008
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the one biggest one farthest back is your muffler
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Old 08-29-2008
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well i know where the muffler is, but theres 4 things in between the engine and the joint in the pipe, right behind the catalyc converter. i just dont know what the other things are, if they are smaller cats or if they serve some other purpose
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Old 08-29-2008
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The newer trucks have 4 cats, I believe. Not sure why, though.
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Old 08-29-2008
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The newer trucks have 4 cats, I believe. Not sure why, though.
My 07 4.0 only has the 2 cats at the firewall
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Old 08-29-2008
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My 2001 has 4 cats. It's the norm, Ford's way of making that thing EPA legal.

1 right after each header. 1 before the y pipe, 1 after the y pipe, 1 before the muffler (I think thats correct)
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Old 08-29-2008
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And they are all high flow cats.
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Old 08-29-2008
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2 pre cats on the ypipe and 2 main cats
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Old 08-30-2008
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There are different configurations for different years. (gotta love ford sometimes)

My 06 has three. The two front ones are pre cats. They pre heat the exhaust before it goes into the main cat.

Most of these modern cars now-a-days have 3 or 4 02 sensors too. The front two are *before* the pre-cats. And the last 1 or 2 are *after* the last cat. It tells the PCM how the cats are performing.

Anything down stream of the last 02 sensor/s are mufflers or possibly resonators.

Rich
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  #11  
Old 08-30-2008
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resonators anyone?
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Old 08-30-2008
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I was just speaking in generic terms. I've never seen one on a ranger. Usually you'll only see them on high end cars or cars where they are trying to have a certian exhaust note. (like our caddy eldo)
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Old 08-31-2008
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I've cracked open the pipe on my 01 4.0 and all 4 are cats, no resonators.
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Old 09-01-2008
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Guess for 07 they went back to only 2 cats.
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Old 09-02-2008
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Guess for 07 they went back to only 2 cats.
2007 V6's still have 4 bricks, 2 in each housing.
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Old 09-02-2008
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My 04 had 3...
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