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  #1  
Old 02-17-2011, 11:07 PM
Darwin Darwin is offline
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Default Cat Converter...Im'a dog person...

Im a new guy here with an older truck and a newbie question.. Here's the story...I'm running a 96 XLT 3.0 5 sp. , I love the little guy as it is beefy , in great body shape , and runs like a champ. Who ever had it took care of it but after getting under the hood a bit I found that although they may have waxed it a bunch they didnt keep up on the no brainer driveway maintence. When I got it it seemed sluggish (even for the 3.0 !) and sure enough plug cables look stock and the motorcraft plugs were all but rusted in ( 2 days + 1 can of liquid wrench + 10 bloody knuckles) ..After new Bosch D.P. Plugs , matching cables, new air filter, and a few tanks with friction modifier and injector cleaner through it I have it at 14.5 -15.5 city mpg and 18.5+ highway from a whopping 13 city/ 15 highway...I drive like an old lady realizing it is a bit of old iron but she really meets and passes my initial expectation...anyway all is well and getting ever better until...CHECK ENGINE LIGHT....still running great, fair exceleration (for the 3.0) and consistant MPG...So like a good (stupid) sheep I go to the dealer already having a fair idea what it is...Cat.converter or other component..and of course for $110 I get the wonderful prized of them telling me it is the cat or a senor (duuhh) and for an additional $975 they might be right and get it fixed...My real question is,and I am expecting flak for this so feel free to let me have it, bypass (cut out and straight pipe) the cat? Whilst doing basic research Ive gotten mixed pros and cons... my point is it's a 96 and not getting any younger , possibilty of inspection is very low, and the money just isnt there...Just looking for feedback from "those that knows". I wont be touching anything until I get a clearer idea of what is really the less stupid thing to do...
Thanks Gents..
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  #2  
Old 02-18-2011, 12:24 PM
1996xlt 1996xlt is offline
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Default Re: Cat Converter...Im'a dog person...

Definately not worth $1000 to find out what's wrong. I've ditched cats on other cars but not the Ranger yet. Since its OBDII you will need to get an O2 sensor simulator to shut the CEL off. Other than that there's no down side except it will probably be a bit louder.
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  #3  
Old 02-18-2011, 12:28 PM
90fordranger 90fordranger is offline
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Default Re: Cat Converter...Im'a dog person...

hey, I have a question too. If i take my cat off, and just have my flow on there. Will that screw anything up?

I got a 2.9 v6. thanks alot.
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  #4  
Old 02-18-2011, 05:37 PM
darkstar_420 darkstar_420 is offline
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Default Re: Cat Converter...Im'a dog person...

yes because you have o2 sensors, you need dummy sensors or else itll run like shit
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  #5  
Old 02-18-2011, 06:37 PM
turbographx turbographx is offline
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Default Re: Cat Converter...Im'a dog person...

Quote:
Originally Posted by darkstar_420 View Post
yes because you have o2 sensors, you need dummy sensors or else itll run like shit
Only if they have o2 sensors after the cat. If the o2 sensors are before the cat, like the two o2 sensors on my '93 3.0, they will be fine.
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Mods: New engine and trans. Cluster swap with tach. New headunit and speakers all around. 4x4 front valance. Led turn indicator mirrors. Crystal clear head lamps. Clear corners. 5" driving lights in Valance.
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  #6  
Old 02-19-2011, 11:02 PM
chazzone chazzone is offline
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Default Re: Cat Converter...Im'a dog person...

Unless it's been running rich for a long time, the cats are probably fine. There is absolutely no performance gain from removing perfectly good cats.
Besides, nothing says "shadetree mechanic" like cutting off the cats.
The O2 sensor is probably the culprit, especially if you've just poured a bunch of stuff into the fuel system.
O2 sensors are not hard to diagnose, and can be done while still on the vehicle.
Here's a link that gives the proceedure:
Pt1:
Pt2:
BTW, you'll probably be replacing those spark plugs soon, too.
That engine was designed to run Motorcraft plugs, and nothing works better than Motorcraft or Autolite equivalent, and double plugs are nothing but a scam.
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  #7  
Old 02-20-2011, 11:06 AM
Darwin Darwin is offline
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Default Re: Cat Converter...Im'a dog person...

Hey, Great info guys!
And look another 26" of snow after two weeks of 50+ weather here in MN...Ranger to the rescue!
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  #8  
Old 02-20-2011, 04:35 PM
oldcarfart oldcarfart is offline
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Default Re: Cat Converter...Im'a dog person...

Everything I have has had the "cats" fall off, one of the reasons I moved to SC is no emission inspection, but they sure need a safety insp to get rid of the ratmobiles.
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  #9  
Old 02-20-2011, 04:47 PM
FireRanger FireRanger is offline
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Default Re: Cat Converter...Im'a dog person...

Quote:
Originally Posted by Darwin View Post
After new Bosch D.P. Plugs...
They probably won't last. Bosch plugs fail on our engines. So just know that you will probably be replacing them again soon. Motorcraft or Autolite brand only.
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  #10  
Old 02-20-2011, 10:13 PM
Darwin Darwin is offline
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Default Re: Cat Converter...Im'a dog person...

Hmmm..looks like I'll be getting spare plugs just in case.thanks for the heads up mate..looks like I do have an O2 sensor after the cat.
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  #11  
Old 02-21-2011, 07:29 AM
FireRanger FireRanger is offline
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Default Re: Cat Converter...Im'a dog person...

Why do you want to replace the cats? There's probably nothing wrong with them and cats don't trip CEL's. Its just sensors. Don't waste your time and money.
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