catalytic problem

projectBlack · 04-08-2012, 07:35 PM

i am pretty sure our 98 explorer with the 4.0 sohc has a stopped up cat, since we are a non emissions county i was wondering if these x's will run correctly without catalytic guts? we dont plan on ever selling it we love it but i dont wanna pay the 388 for new cats. i know some of the newer vehicles will not run correctly with out them.

joe doe · 04-08-2012, 07:50 PM

it will probably run fine without it ,but it will throw a code .the 02 sensor after the cat will trip the code .
(theres a sensor before and after the cat and when those 2 come up with the same reading the code will trip)
i done the same to my ford van (gutted the cat) and it throws a code now .i just clear the code before inspection and all is fine .

projectBlack · 04-08-2012, 08:06 PM

i did it on 3 mustangs from 96-98 and never a problem a friend did it on a 02 ranger and it ran like garbage until put factory exhaust on it. i never tried it on a ex didnt wanna mess it up by gutting it. it is driveable but throwing a emission code and runs ruff

drdoom · 04-08-2012, 08:31 PM

SOHC engine is designed to have operate with a significant back-pressure. Using an infrared thermometer, take the temperature readings at the inlet & outlet points. That will confirm the condition of your cats.

projectBlack · 04-09-2012, 09:41 PM

will it effect motor if the guts are gone?

my98nnj · 04-10-2012, 07:36 AM

Quote:

Originally Posted by drdoom

SOHC engine is designed to have operate with a significant back-pressure.

Umm, no.
Back pressure in an exhaust system is a myth.
Google it.

drdoom · 04-10-2012, 07:46 AM

OK, my mistake. Regardless, it should have a proper converter.

*splodo49* · 04-11-2012, 09:01 PM

I dont know everything but back pressure does play some role, i have modified cats and it will throw a check engine light. If this is your daily rig, you might want to clean it out first and see what happens if you dont like it then save up them bucks. Good luck. Or unbolt it before the cat and see if you can tell if there is a difference, but dont go to far, it gets hot underneath. (And is Loud!!)

my98nnj · 04-12-2012, 09:26 AM

Quote:

Originally Posted by splodo49

I dont know everything but back pressure does play some role,

Back pressure is a no-no in your exhaust system. The only role it would play if it were present would be a lack of performance.

It's called exhaust scavenging. Google it.

**Turdle** · 04-12-2012, 10:01 AM

The only "legal" recommendation would be to replace the cats. Removal is violation of federal laws.

04-08-2012, 07:35 PM	#1
projectBlack Wannabe Elite Explorer Clayton, Ga 91 explorer 4x4 5speed Join Date: Jan 2012 Posts: 82 Vehicle Specs (Original Poster)	catalytic problem i am pretty sure our 98 explorer with the 4.0 sohc has a stopped up cat, since we are a non emissions county i was wondering if these x's will run correctly without catalytic guts? we dont plan on ever selling it we love it but i dont wanna pay the 388 for new cats. i know some of the newer vehicles will not run correctly with out them. __________________ 1991 exploder 4.0 manual 5 speed lower gear set, 2 inch lift in front, shackles in rear, 31x10.5x15 radial, 15x10 tri spoke's, two 10" sony subs ported box, 200x2 rockford amp, 10 farad capacitor, tinted turn's, tinted tail's, , 1996 F150 5.0, 5 speed tranny, 4x4 all manual, new rear end, trans, 6" skyjacker lift, front end, 35x12.5x15 mud terrain, 15x10 mickey thompson classic II

04-08-2012, 07:50 PM	#2
joe doe Wannabe Elite Explorer slatington,pa 2000 ex sport 4.0 ohv Join Date: Apr 2003 Posts: 588 Vehicle Specs	it will probably run fine without it ,but it will throw a code .the 02 sensor after the cat will trip the code . (theres a sensor before and after the cat and when those 2 come up with the same reading the code will trip) i done the same to my ford van (gutted the cat) and it throws a code now .i just clear the code before inspection and all is fine . __________________ joe doe the man you dont get to know...lol

04-08-2012, 08:06 PM	#3
projectBlack Wannabe Elite Explorer Clayton, Ga 91 explorer 4x4 5speed Join Date: Jan 2012 Posts: 82 Vehicle Specs (Original Poster)	i did it on 3 mustangs from 96-98 and never a problem a friend did it on a 02 ranger and it ran like garbage until put factory exhaust on it. i never tried it on a ex didnt wanna mess it up by gutting it. it is driveable but throwing a emission code and runs ruff __________________ 1991 exploder 4.0 manual 5 speed lower gear set, 2 inch lift in front, shackles in rear, 31x10.5x15 radial, 15x10 tri spoke's, two 10" sony subs ported box, 200x2 rockford amp, 10 farad capacitor, tinted turn's, tinted tail's, , 1996 F150 5.0, 5 speed tranny, 4x4 all manual, new rear end, trans, 6" skyjacker lift, front end, 35x12.5x15 mud terrain, 15x10 mickey thompson classic II

04-09-2012, 09:41 PM	#5
projectBlack Wannabe Elite Explorer Clayton, Ga 91 explorer 4x4 5speed Join Date: Jan 2012 Posts: 82 Vehicle Specs (Original Poster)	will it effect motor if the guts are gone? __________________ 1991 exploder 4.0 manual 5 speed lower gear set, 2 inch lift in front, shackles in rear, 31x10.5x15 radial, 15x10 tri spoke's, two 10" sony subs ported box, 200x2 rockford amp, 10 farad capacitor, tinted turn's, tinted tail's, , 1996 F150 5.0, 5 speed tranny, 4x4 all manual, new rear end, trans, 6" skyjacker lift, front end, 35x12.5x15 mud terrain, 15x10 mickey thompson classic II

04-11-2012, 09:01 PM	#8
splodo49 Ejection seat man.. Tooele,Utah 94 XLT,75 FJ, 05 Cummins Join Date: Jun 2003 Posts: 709 Vehicle Specs	I dont know everything but back pressure does play some role, i have modified cats and it will throw a check engine light. If this is your daily rig, you might want to clean it out first and see what happens if you dont like it then save up them bucks. Good luck. Or unbolt it before the cat and see if you can tell if there is a difference, but dont go to far, it gets hot underneath. (And is Loud!!) __________________ SAS BUILD UP 2.5 Ton Rocks, Fully Locked, Pinion Brakes, Full Hydro, Re-Centered H1s, Rock rings. 42" Pitbulls Max speed about 35-40

04-08-2012, 08:31 PM	#4
drdoom Wannabe Elite Explorer VA 1997 XLT 4.0 SOHC 4WD Join Date: Dec 2007 Posts: 1,505 Vehicle Specs	SOHC engine is designed to have operate with a significant back-pressure. Using an infrared thermometer, take the temperature readings at the inlet & outlet points. That will confirm the condition of your cats.

04-10-2012, 07:46 AM	#7
drdoom Wannabe Elite Explorer VA 1997 XLT 4.0 SOHC 4WD Join Date: Dec 2007 Posts: 1,505 Vehicle Specs	OK, my mistake. Regardless, it should have a proper converter.

04-12-2012, 10:01 AM	#10
Turdle Old and in the way Humboldt, Kansas 2000 Mounty Join Date: Jun 2003 Posts: 23,738 Vehicle Specs	The only "legal" recommendation would be to replace the cats. Removal is violation of federal laws. __________________ Jon 2000 Mountaineer Turdle-gone Vitamin D Wagon Sold also

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