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Gordo74
Premium
join:2003-10-28
Monroeville, PA
reply to Anonymous_

Re: catalytic converter? P0420

said by Anonymous_:

I Tired Premium fuel and the code went away. That was for the long trip.

Tired with mid-grade fuel again code came back. interesting. $75 worth of fuel down the drain. I think the PCM was tunned for Premium fuel. Huge possibility. since it had 5 previous owners.

I just going to use up the tank and filler up with Premium chevron fuel.

If it has a tuned PCM, it WILL need premium fuel.

I would contact Miltzy motorsports (most likely the ones who tuned it) and see if they will send you a stock one aback in exchange for your tuned one.


gillespie
Premium
join:2001-11-28
USA
reply to Anonymous_

Interesting, you might want to take it to the stealership and have the factory tune put back in and go from there.



Anonymous_
Anonymous
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1 edit
reply to gillespie

I Tired Premium fuel and the code went away. That was for the long trip.

Tired with mid-grade fuel again code came back. interesting. $75 worth of fuel down the drain. I think the PCM was tunned for Premium fuel. Huge possibility. since it had 5 previous owners.

I just going to use up the tank and filler up with Premium chevron fuel.



gillespie
Premium
join:2001-11-28
USA
reply to Cho Baka

Bet me! Bought it at a place called the Muffler warehouse in Ashland. $90 out the door. It's a universal heavy duty cat. Has lasted over 90k with not even a hint of a problem.
03 Grand AM 3.4L.



Cho Baka
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reply to gillespie

said by gillespie:

I would agree if you get it at a big chain store, but they make high quality aftermarket cats that perform just as good if not better than the factory cat.

Not a chance. Not for anywhere near $90.00, that is for sure.
--
The talented hawk speaks French.


gillespie
Premium
join:2001-11-28
USA
reply to pwncicle

I would agree if you get it at a big chain store, but they make high quality aftermarket cats that perform just as good if not better than the factory cat.



pwncicle

@comcast.net
reply to gillespie

This is California we are talking about here. A aftermarket CAT is not sufficient enough for our tough standards.



gillespie
Premium
join:2001-11-28
USA
reply to Anonymous_

said by Anonymous_:

going to get it fixed but later this year when it's time to smog.

FACTORY replacement is required to pass.

otherwise getting a after market is throwing money into a money pit.

Not true. IIRC Fed. law states that you must have a converter installed. It doesn't state anywhere that it has to be factory.
As far as an aftermarket converter, I got one from a place that only does exhaust. I got a heavy duty universal converter and installed it myself. That was roughly 90k miles ago and haven't had a lick of trouble. Now having said that, I strongly discourage you from getting one from Autozone or Advance auto parts. I guarantee you 'll have problems. BTW the converter only cost $90 out the door.


Anonymous_
Anonymous
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3 edits
reply to Cho Baka

said by Cho Baka:

If that cooling system is clean, then I am a monkey's uncle.

By the way, did you ever get that cat dent out of your fender?

Yeah but it left a ruffle in the metal/paint
Now I having issue with the land owners dogs jumping on my car.
but if they damage it he has to pay for it or get it fixed, no more free passes.

Yes the coolant is Clear pink in color in the radiator.
I mix my own coolant 50/50mix

since premixed 50/50 is a scam , the non mixed makes 2 gallons for the price of one gallon 50/50mix.

50%/50% mix=12.99
100% coolant is 13.99 +1 gallon distilled water =0.99cents =14.99

=16.39 including sales tax

2 gallons of 50/50 is 29.42 including sales tax

since you are paying for only 50% of the coolant and the rest is water.

this comes out to paying 13.03 for just water and a bottle.


Cho Baka
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join:2000-11-23
there
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reply to Anonymous_

If that cooling system is clean, then I am a monkey's uncle.

By the way, did you ever get that cat dent out of your fender?
--
The talented hawk speaks French.



Anonymous_
Anonymous
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1 edit
reply to Gordo74

Re: catalytic converter? P0240

said by Gordo74:

What does the radiator cap have to do with the issue at hand? A good cleaning of it would have been fine rather than replacing it.

And you bought a thermostat just because they only had a few left in stock? You realize places like rockauto.com are cheaper and ship to your door, yes? Why buy something when you don't need it?

For someone who complains so much about how the car "costs you too much" (other thread), you sure do love throwing needless money at it.

Thermostat is going to be returned as the new cap fixed the issue.
If you see the rubber seal is torn and cracked .
That probably means it has a poor seal on it.

Car sits at the under the middle line even with the a/c on full blast.

Yes rocketauto is great but if you need the item by tomorrow it will cost the same or more to get it.


Gordo74
Premium
join:2003-10-28
Monroeville, PA
reply to Anonymous_

What does the radiator cap have to do with the issue at hand? A good cleaning of it would have been fine rather than replacing it.

And you bought a thermostat just because they only had a few left in stock? You realize places like rockauto.com are cheaper and ship to your door, yes? Why buy something when you don't need it?

For someone who complains so much about how the car "costs you too much" (other thread), you sure do love throwing needless money at it.



Anonymous_
Anonymous
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reply to rockotman

Click for full size
said by rockotman:

said by Cho Baka:

said by Anonymous_:

that was the fuel regulator

That killed the cat.

I thought curiosity killed the cat.

I mentioned a failed cat that I experienced above. The dealer service manager at the dealer thought that a failed ignition module that I had experienced a few months earlier which turned my 4-cylinder into a 2-cylinder on Christmas day the previous year may have lead to my premature cat failure.

As I loaded the family into the car on Christmas day to go visit relatives, the car ran extremely rough, so I parked it and we all jumped into my son's Scion to go visit family. I can tell you that 6'1" does not fit well in the back of a tC.

Anyway, the next day I dropped my "2-cylinder" off at the dealer (1 mile from the house) to get it fixed under warranty. It was, as I suspected, the ignition module. It was dumping raw fuel into the exhaust for only about the 5 or 10 minutes it took to get to the dealer. But the following March, the cat failed.

replaced the radiator cap as it had caked on dirt preventing it from working correctly. I got a thermostat as well but I have not installed it Only got it because they only had a few left in stock.

coolant is clean so it does not need to be changed


rockotman
...Blown On The Steel Breeze
Emerging Research
join:2000-08-06
DSotM
kudos:2
reply to Cho Baka

said by Cho Baka:

said by Anonymous_:

that was the fuel regulator

That killed the cat.

I thought curiosity killed the cat.

I mentioned a failed cat that I experienced above. The dealer service manager at the dealer thought that a failed ignition module that I had experienced a few months earlier which turned my 4-cylinder into a 2-cylinder on Christmas day the previous year may have lead to my premature cat failure.

As I loaded the family into the car on Christmas day to go visit relatives, the car ran extremely rough, so I parked it and we all jumped into my son's Scion to go visit family. I can tell you that 6'1" does not fit well in the back of a tC.

Anyway, the next day I dropped my "2-cylinder" off at the dealer (1 mile from the house) to get it fixed under warranty. It was, as I suspected, the ignition module. It was dumping raw fuel into the exhaust for only about the 5 or 10 minutes it took to get to the dealer. But the following March, the cat failed.
--
Shine on you crazy diamond...


Cho Baka
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reply to Anonymous_

said by Anonymous_:

that was the fuel regulator

That killed the cat.
--
The talented hawk speaks French.


Anonymous_
Anonymous
Premium
join:2004-06-21
127.0.0.1
kudos:2
reply to Lagz

that was the fuel regulator



Lagz
Premium
join:2000-09-03
The Rock
reply to Anonymous_

Hmmm .. p0420 and a rough idle.
»03 impala idle issues
2 + 2 = 4



Anonymous_
Anonymous
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3 edits
reply to rockotman

said by rockotman:

Hmmm.... a clogged cat can also cause excessive back-pressure which can lead to overheating.

100% "clear" air comes from the tail pipe. a lot of it
before I was getting 22-23mpg highway

Now gas mileage shot up was getting 35MPG (300miles round trip total) (computer claimed 45MPG average though.)
80 to 99 (inst mpg)


rockotman
...Blown On The Steel Breeze
Emerging Research
join:2000-08-06
DSotM
kudos:2
reply to Anonymous_

Hmmm.... a clogged cat can also cause excessive back-pressure which can lead to overheating.



Anonymous_
Anonymous
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1 edit
reply to Cho Baka

said by Cho Baka:

That is a funny list. I googled it, and in the first hit it seems to have been posted in the comments on an Amazon sale for an O2 sensor.

The second link, »www.obd-codes.com/p0420 , has these 2 gems:
"Overall probably the biggest mistake vehicles owners make when they have a P0420 code is to simply replace an oxygen sensor (H02S). It is important to do proper diagnosis so you're not wasting money replacing parts unnecessarily.

We strongly recommend that if you need to replace the catalytic converter that you replace it with an OEM unit."

Go ahead and replace that sensor if you want. It isn't my money you are burning.

Thanks the light went off, after I smacked the catalytic converter, with a rubber mallet.
saved $1400 doing that. 150miles+ no light

Now I have to deal with the thermostat... since it's overheating now, to keep it under the 1/2 point I drove it 150 miles with the heater on and windows & moon roof open)

coolent is full maybe it has some air in the system or thermostat is failing ?

yes it has coolant in it

Formeister

join:2000-10-28
Somers, CT
reply to Cho Baka

P0420 Catalytic efficiency below threshold value.

My daughter's 1998 Accord threw this code twice, about two years apart. The first time I guessed and didn't test the 02 sensor, just replaced the easiest sensor to reach, the one after the cat and code cleared. Two years later, same code. Naturally, I replaced the inlet O2 sensor this time. Code cleared. Car sold three years later with original cat and 240K miles.

The cat converter efficiency can only be measured by two O2 sensors: in and out.

So, I would test each O2 sensor as they are so easy to remove, before I'd spend a bunch on a new cat.

BTW, there are thermal tests that can be done on a cat to determine if it's functioning correctly but most home owners don't usually have the thermocouple sensors and meters.

Cats do fail, I've just never seen it on many high (>200K mile) cars that I have driven, ymmv.



Cho Baka
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reply to Anonymous_

That is a funny list. I googled it, and in the first hit it seems to have been posted in the comments on an Amazon sale for an O2 sensor.

The second link, »www.obd-codes.com/p0420 , has these 2 gems:
"Overall probably the biggest mistake vehicles owners make when they have a P0420 code is to simply replace an oxygen sensor (H02S). It is important to do proper diagnosis so you're not wasting money replacing parts unnecessarily.

We strongly recommend that if you need to replace the catalytic converter that you replace it with an OEM unit."

Go ahead and replace that sensor if you want. It isn't my money you are burning.
--
The talented hawk speaks French.



Anonymous_
Anonymous
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127.0.0.1
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4 edits
reply to Gordo74

mileage is sloppy been getting 18MPG city(@near highway speeds 45-65mph ) and 23MPG on the freeway.(very hilly though)

before the fuel regulator went out I was getting 17/22
when the fuel regulator was dead 9MPG/15MPG
(No visible smoke with the "rich mixture")

Not getting any visible smoke from the tail pipe.
using 1 qt of oil every 2,000-2100 miles which is at manufacture specification.

I use 89 octane fuel
engine runs quieter over all with this fuel.

engine Is running warmer then normal (but still with in the normal accepted rage aka the middle)

But I think it still should be less since it is winter and is fairly cold outside mid 40's

Ones in bold might be the possible issue

A code P0420 may mean that one or more of the following has happened:
Leaded fuel was used where unleaded was called for

A damaged or failed oxygen sensor (HO2S)
Downstream oxygen sensor (HO2S) wiring damaged or connected improperly
The engine coolant temperature sensor is not working properly
Damaged or leaking exhaust manifold / catalytic converter / muffler / exhaust pipe
Retarded spark timing
The oxygen sensors in front and behind the converter are reporting too similar of readings
Leaking fuel injector or high fuel pressure


Cylinder misfire
Oil contamination



Gordo74
Premium
join:2003-10-28
Monroeville, PA
reply to Cho Baka

said by Cho Baka:

said by Gordo74:

P0420 on my Impala ended up being that there was a vacuum leak in the system near the gas tank. A tube came loose is all.

That makes no sense. Perhaps you have misremembered your code?

I never said it made sense, but repairing the vacuum leak made it go away and MPG returned to normal.

telco_mtl

join:2012-01-06
reply to Anonymous_

Re: catalytic converter? P0420

said by Anonymous_:

going to get it fixed but later this year when it's time to smog.

FACTORY replacement is required to pass.

otherwise getting a after market is throwing money into a money pit.

just curious, where are you? can you get a used one from a jurisdiction that doesnt have rules about selling used cat's

Formeister

join:2000-10-28
Somers, CT
reply to Anonymous_

said by Anonymous_:

I think the o2 sensor needs replacement because of the fuel regulator issue ,cause it to get "dirty" due to the rich mixture.

I've heard that rich mixtures will cause cats to overheat and kill them.


rockotman
...Blown On The Steel Breeze
Emerging Research
join:2000-08-06
DSotM
kudos:2
reply to Anonymous_

How many miles on the car? By federal law, cats are required to be covered for 8 years/80K miles on cars from 1995 and later.
--
Shine on you crazy diamond...



Anonymous_
Anonymous
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reply to rockotman

going to get it fixed but later this year when it's time to smog.

FACTORY replacement is required to pass.

otherwise getting a after market is throwing money into a money pit.
--
Well, does your car at least turn into something else? Sometimes I turn it into a trashcan. Hmm...



rockotman
...Blown On The Steel Breeze
Emerging Research
join:2000-08-06
DSotM
kudos:2
reply to Anonymous_

I have had a P0420 code once. It was indeed a failed converter. Luckily, the converter was still under warranty.
--
Shine on you crazy diamond...