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Old 02-17-2010, 12:48 AM
99nwranger 99nwranger is offline
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Default cat code help

hi i just bought a 1999 ranger 4.0 4x4 5speed and i have been getting horrible gas mileage. at my last fill up i got 11 mpg. the truck has 116000 miles and i had a buddy check for codes. it came up with an o2 sensor reading so i replaced all the o2 sensors. it also came up with a cat problem and im not totally sure but i think the cat is gutted. is there anyway to cancel out the o2 sensor after the cat? also what else should a do for better economy?

plugs?
fuel filter?
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Old 02-17-2010, 07:36 AM
bigcountry bigcountry is offline
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plugs,wires,fuel filter,adjust tps if needed,clean MAF,new air filter,seafoam the intake and some in the gas tank,correct tire pressure
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ported and polished TB
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Old 02-17-2010, 08:00 AM
BigT8600 BigT8600 is offline
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Quote:
Originally Posted by bigcountry View Post
plugs,wires,fuel filter,adjust tps if needed,clean MAF,new air filter,seafoam the intake and some in the gas tank,correct tire pressure
What he said.

I've got the same codes. I've done all but seafoam and fuel filter. Doing that soon. I get 15-16 MPG.
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Old 02-17-2010, 08:16 AM
Lovell's 99 Lovell's 99 is offline
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I also have a99 4.0 v-6 auto 5-speed 4x4 offroad. My gas milage is about 12-13/gal, and i had a o2 sensor go or 2,which set off codes for my cat. if you have the 4.0 v-6 then you should have 2 in-line cats and a o2 sensor trailing them. as far as gas mileage, my truck is runnin tip-top with all plugs wires sensors ok. must be the gears in front and rearend.
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Old 02-17-2010, 11:29 AM
bigcountry bigcountry is offline
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Quote:
Originally Posted by Lovell's 99 View Post
I also have a99 4.0 v-6 auto 5-speed 4x4 offroad. My gas milage is about 12-13/gal, and i had a o2 sensor go or 2,which set off codes for my cat. if you have the 4.0 v-6 then you should have 2 in-line cats and a o2 sensor trailing them. as far as gas mileage, my truck is runnin tip-top with all plugs wires sensors ok. must be the gears in front and rearend.
if ur getting 12/13mpg i think u might want to stay off the skinny pedal a bit hahaha jk if you got bigger than stock tires than yea a regear would help you out a bit
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Never tell people how to do things. Tell them what to do and they will surprise you with their ingenuity."
General Geroge S Patton
2007 3.0
automatic trans, 4.10s with L/S
ported and polished TB
4brand new speakers with inslation in doors
smoked tail lights
20%tint on driver and passenger windows
5% tint on back window
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  #6  
Old 03-15-2010, 07:42 PM
99nwranger 99nwranger is offline
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Default Re: cat code help

so it turns out it was a bad mass airflow sensor. went from a low 11mpg highway and city to about 18-20 mixed so much happier. anyone gettin bad gas mileage i recommend changing the mas sensor. it works wonders
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