catalytic converters

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Jun 9, 2007 | 11:50 PM

kjohnson

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catalytic converters

If I take the converters off of my truck, will the check engine light come on?

2002 Ford F-150 XLT 4x4
74,000 miles
Not sure about the 7700lbs.

Jun 10, 2007 | 02:23 AM

Dustin1690

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From: Saskatoon Saskatchewan

Possibly i dont think so this i think applies to the o2 sensors im not sure if they are in the cats but i dont have any cats on my truck it has never shown the check engine light

Jun 10, 2007 | 04:56 AM

Joe Finn

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From: DC

Yes, the CEL will come on. There are O2 sensors before and after the CATS.

Jun 10, 2007 | 05:39 AM

ncranchero

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From: E.Lincoln County, NC

The "after" O2 sensors will be what sets off the light. You can "fix" that with your choice of these:
http://motors.search.ebay.com/?from=...MIL+eliminator

Jun 10, 2007 | 10:13 AM

kjohnson

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How many of the MIL+eliminator will I need if I remove my converters? Thanks for the info.

Jun 10, 2007 | 10:29 AM

osteodoc08

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Not to rain on your parade, but taking the cats off is illegal. If you don't care, the choice is entirely up to you. It's not like I don't speed every day.....

I'm just making sure you are aware of this. There are always high flow cat options

Jun 10, 2007 | 01:50 PM

StephenH

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From: New Mexico

You will need them for your back two sensors. Leave the front sensors on.

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Jun 10, 2007 | 10:16 PM

ATC Crazy

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From: SW VA

Good luck getting the truck inspected with no cat converters on it. I'd take them off and weld a straight piece of pipe through them, then weld them back on so it looks like they are functional.

www.o2sensorsimulator.com

Jun 11, 2007 | 05:31 AM

#10

ncranchero

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From: E.Lincoln County, NC

Quote:

Originally Posted by ATC Crazy

Did that on my Ranger a couple of years back. Never had an inspection problem!

Jun 11, 2007 | 06:05 AM

#11

kjohnson

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If I weld the piece of pipe through the converts, will I still need the MIL-eliminators?

Jun 11, 2007 | 06:12 AM

#12

ncranchero

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From: E.Lincoln County, NC

Yes. Welding the pipe through them is in effect the same thing as removing them except they "visually" remain. Fools the inspector. Even after straight piping my Ranger converter my tailpipe readings were in the "PASS" range.

Jun 11, 2007 | 07:14 AM

#13

phil6608

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From: Stanton DE

If you leave the o2 sensors in place you may not get a light.
I have talked to people that have not got a light and some do.

I would recommend running 2 high flow cats to replace the 4 cats.And putting the o2s back as close as you can to ware they were.
Then your legal and it will sound great!

Jun 11, 2007 | 10:07 AM

#14

ncranchero

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From: E.Lincoln County, NC

I am pretty much in agreement, unless your cats are stopped up they're not worth messing with. If they are restricted, straight pipe 'em and put 'em back.