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2.9L & 3.0L V6 Tech General discussion of 2.9L and 3.0L V6 Ford Ranger engines.

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Old 09-16-2009
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removing the cats

i got a 2000 ranger with a 3.0 flex and im gonna redo my exhaust and i wanna remove the cat....and maybe the two resonators or precats or whatever they are.....will removing the cat effect the 02 sensor?....i.e making my truck run like crap?anybody do this got pics?>
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Old 09-16-2009
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You will get CELs and you will probably end up losing power. I would not even bother doing anything more than headers and a cat back. Its not like you are going to gain a crap load of power by doing a full exhaust. In the end you have a crappy flowing v6.
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Old 09-16-2009
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Will removing the cats make the exhaust any louder or change the tone?
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Old 09-16-2009
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whats cels....?...and i think my cat is clogged so if i remove it whats the downfall?
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Old 09-16-2009
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Down fall is emissions and poor performance. you will also end up with a check engine light (CEL) just replace the clogged ones and do headers and cat back then you will have a happy flowing 3.slow
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Old 09-16-2009
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CEL = Check Engine Light. Removing the cat will change the tone a bit and make the exhaust louder. If you have a clogged cat you will gain some power lost from the clogged cat but you would end up with less in the end. You need some backpressure for a stock engine to work properly that's why you can't just run a 5" pipe for an exhaust. Taking one cat off may not do anything at all but taking all of them off will lower engin power output.
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Old 09-16-2009
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ok so if i just remove the one will the light come on?...the big one....im just replacing it with the same size pipe.....basically removing a filter it should keep close to the same back pressure.....cant afford headers right now and i already have a cat back exhaust
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Old 09-16-2009
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If its before an O2 sensor then yes the light will come on. The last O2 checks to see how well the cats are working.
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Old 09-16-2009
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damn just cant win here can i
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Old 09-16-2009
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Man esp with a 3.0, headers aint gonna do jack. They really only work on v8's...Well not unless your gonna get a supercharger, but i highly doubt you are, least hope you dont.
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Old 09-16-2009
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im not looking for power gain i just wanna get rid of the catand not throw a code and not lose power.................i would love u cut it out and run tru duals all the way back but that dam o2 sensor
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Old 09-16-2009
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You could probably use an O2 simulator. That will trick the computer to thinking that there is a cat.
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Old 09-16-2009
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Quote:
Originally Posted by ranger_1999 View Post
They really only work on v8's...
Headers really only work on vehicles with restrictive factory exhaust manifolds.
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Old 09-18-2009
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idea.....what if i just gut the cat.....?CELS>??
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Old 09-21-2009
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I have a gutted cat, I have 2 codes thrown, O2 sensor and emissions code. Its the same as not even having a cat on except it "looks" like you have functional cats.
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Old 10-13-2009
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I have had good luck with this stuff in the past on my 1986 F150 with known bad cats. YMMV. Of course this does not get at the issue behind the plugged cats. I think it may just be toluene. I'll see if I have an old label to check. Just use it like Seafoam for one can and put the other in the tank.

CATALYTIC CONVERTER CLEANER & DEODORIZER - JCWhitney
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Old 10-14-2009
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3.0s thrive on backpressure. 1/8 th mile i ran 11.1 w/ cats. 11.5 w/o and if your state has emission laws you have to have them cause youll have CEL
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Old 10-14-2009
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I have nightmares about these threads when I sleep.

would you take apart your tv and just start switching wires from here to there?

you don't understand how it works, so don't modify it.
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Old 10-14-2009
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haha Jp7 tell them what they need to do
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Old 10-14-2009
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Quote:
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would you take apart your tv and just start switching wires from here to there?
Yes. That's how I got HDTV. jk
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Old 10-14-2009
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Quote:
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Yes. That's how I got HDTV. jk
explains why I get 3 channels, and 2 of them are in spanish...
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Old 10-14-2009
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Quote:
Originally Posted by Hanks Rangers View Post
Down fall is emissions and poor performance. you will also end up with a check engine light (CEL) just replace the clogged ones and do headers and cat back then you will have a happy flowing 3.slow
I'll quote myself!!! . Best bet with clogged cats is just replace them with new ones get the idiotic ideas of gutting or cutting them off out of your head!!!!

Quote:
Originally Posted by ranger_1999 View Post
Man esp with a 3.0, headers aint gonna do jack. They really only work on v8's...Well not unless your gonna get a supercharger, but i highly doubt you are, least hope you dont.
Here you are incorrect. Headers will work on anything from a twin cylinder engine to a v12 or what ever. They are more "free flowing" than stock manifolds the only way to benefit from them on rangers is to have a tuner and let the computer know whats up.
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