2000 RPM = Death
Legend
Joined: Jul 2011
Posts: 8,259
Likes: 4
From: Austin, TX
I just bought my truck a couple days ago, and the previous owner drilled holes in the cat cause it was clogged (guess I have the plenum problem too), said I could just run a straight pipe in place of the cat. Would this cause any negative affects on the motor due to less back pressure?
Best deal is to replace cat. If not, cut it out and out a straight pipe in - if you don't have emission testing.
Captain
Joined: Dec 2011
Posts: 555
Likes: 3
From: Wisconsin
as long as you have a "normal" muffler (like a magnaflow or most flowmasters) just not a glasspack or straight pipe, you'll have plenty of back pressure. From my understanding the y pipe is pretty restrictive too and will provide you with some backpressure as well
Rookie
Joined: Nov 2011
Posts: 79
Likes: 0
From: Michigan
we have very few jobs left here in MI, but thank God we don't have emissions testing! I know that straight piping it seems like a cheap fix, but to me if I plan on keeping and driving the truck for some time, it would cost more in extra fuel than getting a high flow cat.
Hall Of Fame
Joined: Jul 2006
Posts: 12,204
Likes: 10
From: Gainesville, Ga.
presence or absence of cat should not affect fuel usage. front O2 sensor will maintain fuel trim and computer feedback.
absence of cat might trip a CEL number? along the line of ...cat efficiency low, but even this should not affect mpg.
absence of cat might trip a CEL number? along the line of ...cat efficiency low, but even this should not affect mpg.
Record Breaker
Joined: Aug 2010
Posts: 2,241
Likes: 12
From: Ohio
There was a thread a while ago by Drewactual that suggests that this may not be entirely true: https://dodgeforum.com/forum/2nd-gen...-counting.html
Last edited by kejobe; Dec 14, 2011 at 10:33 AM.
Champion
Joined: Aug 2009
Posts: 3,015
Likes: 8
From: Western NY,
bad injector? plugged injector? have you ran the fuel gauge down to e lately? possibley a fuel filter?
you should be able to hook up a code reader and look for pending codes even before the engine light comes on...
cheap code readers can be had for like $20 like the ELM327 bluetooth or usb ones that work with a pc or even an andriod phone ...I love mine ...way better than the $80 reader I bought a few years ago from harbor freight. they even give you real time sensor readings which help when troubleshooting ..
you should be able to hook up a code reader and look for pending codes even before the engine light comes on...
cheap code readers can be had for like $20 like the ELM327 bluetooth or usb ones that work with a pc or even an andriod phone ...I love mine ...way better than the $80 reader I bought a few years ago from harbor freight. they even give you real time sensor readings which help when troubleshooting ..