Hello
This is about my buddy's 2011 1500 V 8 Dual exhaust ! about 85k on the clock
I can get more info later ,not sure what size V8

Threw 2 codes Rear Bank o2 sensor, Both of them ! if I said that right
I can get the code # later if needed !

MPG has dropped 3 /4 mpg + or-
Runs OK

Can bad Cats cause this issue ? Mainly for the big drop in MPG ?

I know not great info but going off my old brain lol

So if you need better info let me know and I will call him!

I have read a few times about Cat cleaner you dump in the tank. Snake oil or does it work ?

When the rear o2 went out on my car I did not see any real drop in MPG !


Thank you

 

Catalytic cleaner in the fuel wont help.I have heard that acetone or methanol in a C-C removed from the vehicle will clean it

Yes ,f the C-C is plugged up it will not allow exhaust gas to escape and the motor is a pump, so a plugged intake or exhaust will reduce power..

 

> Catalytic cleaner in the fuel wont help.I have heard that acetone or methanol in a C-C removed from the vehicle will clean it

i would say that's probably illegal and not to do it even if it isn't

(the cat is self cleaning when it gets to temperature if it's not burned out. cleaning the cat can certainly get you poisoned and also ruin the cat - by chemically weakening the already near loose particles from where they are supposed to be (skip the long discussion). that's the truth depending on the cleaner.)

 

I'm unsure if a bad cat can cause your sensor codes.

Yes sensors are expensive and sometimes replaced without need. Here: you have to check wiring first and use any "O2 sensor guide" you find online that looks damn good. Always insure 1) good battery 2) good body grounds 3) part in question has voltage tested (both harness and part ohm tested)

Without expensive equipment you can only check if sensors are totally dead (but not if they are mis-functioning). This is why you need to insure your wiring is good.

You need to check your engine codes and transmission codes on ODBII before spending on O2 sensors. Why is because they react to engine output (in tailpipe, on nonleaking exhaust i assume). If you have a "badly running motor" or whacked out trans - you could get O2 lights falsely. Hey if they're old not new lookin, maybe make a bet. It's always quicker and cheaper in the end to do all the work your supposed to do, I'll warn you. You'd think it isn't. "doing it the right way" saves time.

A dented muffler (or cat) can cause engine damage. But that won't show up as O2 codes on ODBII.

You said dual pipes. I assume they are original pipes original muffler. (after markets can change valve opening and performance - don't do it).

I assume the muffler doesn't smell like eggs. I assume you read articles about how to "smell out" a bad cat merely by observing muffler output until O2's kick in / after O2 kicks in (if they do!). should not be a question if "it's perfect". you should know.

Once again, #1 battery, #2 wiring, #3 ohming sensors, #4 ODBC codes (including trans codes) (you must have a well running engine+trans other than O2 to know bad engine output isn't causing O2's to fail: as backwards as that sounds it's true)

#5 allot of things can cause 3mpg drop. hopefully ODBII is right.

 

Back when Catalytic Converters were first rolled out in 1975, LOTS of people thought that they choked up the exhaust system, so they would drill them out. They were, but it was the low, 8 to 1 compression engines that were produced, since Lead was outlawed, as they would plug up a catalytic converter. The only way around that would be to reduce the ignition timing a lot.

Thus the later 1970's engines are all low on horsepower due to low-compression. Later on MTBE (Methyl Tertiary-Butyl Ether) was added to gasoline's, but the old steel service station tanks tended to leak, and MTBE contaminated the soil, and poisoned people's ground-water. Lots of lawsuits occurred and were won by people who had been poisoned by MTBE, and it was also quickly absorbed through the skin, if you spilled some on you filling up your gas-tank.

I don't like or want Ethanol in my gasoline, but it's the same alcohol that is in alcoholic beverages. It has almost 50 percent less BTU's then pure gasoline, but at least it won't do what Lead and MTBE did. Tetra-ethyl Lead was used, because during America's ban on Ethanol for drinking booze was in effect during 1925, when auto-manufacturers wanted to increase the power of Internal Combustion Engines, with high-compression motors, they needed a substance to reduce the knocking of such engines, thus the Ethyl Corporation was born, sans the "Lead" portion.

The only lead I like comes out of the barrel of a firearm, and nothing else, but perhaps wire soldier.

Dentists have been putting 30-50 percent Mercury in their "Silver-Fillings" for ages, as most people know Silver isn't really all that toxic to the human body, anymore then Gold is, whereas Mercury is very toxic to the human body. That is why Gold fillings cost more money, as it is not cheap, as Mercury is. Many Jewish people had their Gold fillings removed by the ****'s during WW II, those fascist creeps who killed so many people..