Pulled the pre cat o2 and man what a difference!
#1
Pulled the pre cat o2 and man what a difference!
some of you might recall a couple weeks ago when i test drove it i said that it didn't seem to have much power. well after reading a lot of threads on here about the semi same problems from others, i noticed people said to pull the pre cat o2 and see if it helps. well i did and man oh man it pepped it back up!
now. what the being said, what am i looking at in terms of problems? also no CEL came on at any point. not sure if that matters or not.
now. what the being said, what am i looking at in terms of problems? also no CEL came on at any point. not sure if that matters or not.
#3
The cat is getting clogged. Read this LOL https://dodgeforum.com/forum/2nd-gen...um-thread.html
i don't think im gonna go that far just yet with the plenum/intake. so if its a clogged cat why not remove the cat completely?
Last edited by blackbeasst; 06-25-2011 at 10:05 PM.
#4
#5
Unfortunately the only way to check your cat is to remove it and examine it. You can try hitting it with a rubber mallet and see if you notice any stuff rattling around in there. if you do, its toast.
You have a few options with regards to a new cat. You can take the old one off, and bash all the crap inside it out with a broom handle, then put it back in. This, however may result in a CEL generated from the POST cat O2, which measures emissions. There is a trick you can do with spark plug non-foulers to get the Post-cat O2 out of the exhaust stream and eliminate the CEL:
http://www.youtube.com/watch?v=KnYUHwTxKkE
This vid shows the general idea. You need 2 of them, they are about 5 bucks a pop at a parts store. You drill one out to fit the O2 sensor, then screw it into the 2nd one, and put the whole thing back into the exhaust.
You can also just weld a pipe in in place of the cat if you wish, again, may result in a CEL.
Shy of that, you can just replace the Cat if you want, But this is pointless / a waste of money if your plenum is toast, as Zman said...it will just get wrecked again real fast.
Keep in mind, if you have emissions testing where you live, you will NOT pass when you do not have a functioning Cat.
As Zman said, 90% of the time with these trucks a clogged cat is the result of blown plenum. Have you checked yours yet? remove the air box, pry open the throttle plates and look down with a flashlight into the intake. Look for oil pooled. if you see some its toast and needs to be replaced. it sucks, and is costly/time consuming, but its a fact of life with these trucks.
You have a few options with regards to a new cat. You can take the old one off, and bash all the crap inside it out with a broom handle, then put it back in. This, however may result in a CEL generated from the POST cat O2, which measures emissions. There is a trick you can do with spark plug non-foulers to get the Post-cat O2 out of the exhaust stream and eliminate the CEL:
http://www.youtube.com/watch?v=KnYUHwTxKkE
This vid shows the general idea. You need 2 of them, they are about 5 bucks a pop at a parts store. You drill one out to fit the O2 sensor, then screw it into the 2nd one, and put the whole thing back into the exhaust.
You can also just weld a pipe in in place of the cat if you wish, again, may result in a CEL.
Shy of that, you can just replace the Cat if you want, But this is pointless / a waste of money if your plenum is toast, as Zman said...it will just get wrecked again real fast.
Keep in mind, if you have emissions testing where you live, you will NOT pass when you do not have a functioning Cat.
As Zman said, 90% of the time with these trucks a clogged cat is the result of blown plenum. Have you checked yours yet? remove the air box, pry open the throttle plates and look down with a flashlight into the intake. Look for oil pooled. if you see some its toast and needs to be replaced. it sucks, and is costly/time consuming, but its a fact of life with these trucks.
Last edited by talthyren; 06-25-2011 at 10:30 PM.
#6
some of you might recall a couple weeks ago when i test drove it i said that it didn't seem to have much power. well after reading a lot of threads on here about the semi same problems from others, i noticed people said to pull the pre cat o2 and see if it helps. well i did and man oh man it pepped it back up!
now. what the being said, what am i looking at in terms of problems? also no CEL came on at any point. not sure if that matters or not.
now. what the being said, what am i looking at in terms of problems? also no CEL came on at any point. not sure if that matters or not.
#7
Trending Topics
#8
#9
#10
and is it odd that of the symptoms of a blown plenum i have just a couple?
Symptoms of a blown plenum:
1. Excessive oil consumption--NO
2. Heavy spark knock under load (sounds like a can of marbles when you have your foot in it)--NO
3. Truck feels like it was castrated (loss of power)--YES
4. Trouble getting up hills--YES
Shy of that, you can just replace the Cat if you want, But this is pointless / a waste of money if your plenum is toast, as Zman said...it will just get wrecked again real fast.
Keep in mind, if you have emissions testing where you live, you will NOT pass when you do not have a functioning Cat.
As Zman said, 90% of the time with these trucks a clogged cat is the result of blown plenum. Have you checked yours yet? remove the air box, pry open the throttle plates and look down with a flashlight into the intake. Look for oil pooled. if you see some its toast and needs to be replaced. it sucks, and is costly/time consuming, but its a fact of life with these trucks.
Keep in mind, if you have emissions testing where you live, you will NOT pass when you do not have a functioning Cat.
As Zman said, 90% of the time with these trucks a clogged cat is the result of blown plenum. Have you checked yours yet? remove the air box, pry open the throttle plates and look down with a flashlight into the intake. Look for oil pooled. if you see some its toast and needs to be replaced. it sucks, and is costly/time consuming, but its a fact of life with these trucks.
as far as checking my plenum, i have not. here are some pics for whats its worth!
from what i've seen there is a fix to this.