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Stock 1995 - 2001 Explorers Questions related to non-modified 1995-2001 Explorer, Mountaineer, Ranger and '02+ Sports and Sport Trac. Problem solving, maintenance, TSB, service bulletins, owner reviews, specifications.

catalytic problem

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Old 04-08-2012, 07:35 PM   #1
projectBlack
Clayton, Ga
91 explorer 4x4 5speed
 
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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.




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Old 04-08-2012, 07:50 PM   #2
joe doe
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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 .




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Old 04-08-2012, 08:06 PM   #3
projectBlack
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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




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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
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Old 04-08-2012, 08:31 PM   #4
drdoom
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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.
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Old 04-09-2012, 09:41 PM   #5
projectBlack
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will it effect motor if the guts are gone?




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Old 04-10-2012, 07:36 AM   #6
my98nnj
Boonton, New Jersey
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Originally Posted by drdoom View Post
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.
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Old 04-10-2012, 07:46 AM   #7
drdoom
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OK, my mistake. Regardless, it should have a proper converter.
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Old 04-11-2012, 09:01 PM   #8
splodo49
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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!!)




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Old 04-12-2012, 09:26 AM   #9
my98nnj
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Originally Posted by splodo49 View Post
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.
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Old 04-12-2012, 10:01 AM   #10
Turdle
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The only "legal" recommendation would be to replace the cats. Removal is violation of federal laws.
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