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#2452218 - 12/03/11 07:06 PM Fixing Bad Catalytic Converters With P0420
55Test Offline


Registered: 09/22/04
Posts: 1898
Loc: New Brunswick
_________________________
The total sum of everything I have learned from this website: ...Oil in engine, good!

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#2452231 - 12/03/11 07:28 PM Re: Fixing Bad Catalytic Converters With P0420 [Re: 55Test]
JHZR2 Offline



Registered: 12/14/02
Posts: 38387
Loc: New Jersey
Hmmmmm. Well, if it is truly a poorly functioning converter, a few things could work.

One is to remove soot on other surface is exposed, offering up new active material that is not sulfided.

Another would be to reduce the catalyst to bare metal, then re-oxidized.

Third would be to cook the converter to remove the sulfides, though per-reduction would be beneficial.

If a poison is limiting activity due to alloying with the PM, I suppose the only way to go us to remove the material that has alloyed and/or coated to the pm.

Generally the metals are just recovered though, generally through a nasty chloride process.

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#2452314 - 12/03/11 09:18 PM Re: Fixing Bad Catalytic Converters With P0420 [Re: 55Test]
L_Sludger Offline


Registered: 10/04/09
Posts: 2675
Loc: NORTHCOM AOR
A good fix for P0420 is a couple of spark plug anti-foulers screwed into the post-cat O2 sensor bung, with the O2 sensor screwed in at the end.

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#2452523 - 12/04/11 06:38 AM Re: Fixing Bad Catalytic Converters With P0420 [Re: 55Test]
LeakySeals Offline


Registered: 02/18/11
Posts: 5292
Loc: MA
Scotty's excellent. He's proven its possible. However his soapy water methods are prior to recent chemist studies that found a Citric Acid bath is the way to go over soaps that contain some oils and other products. If you google around you will find people that have done it with success.

I plan to do this on the front manifold cat when I have time. From what I read you buy Citric Acid Powder, mix it with warm water, let cat soak immersed 6-8 hours, pressure rinse (not too much). My attempt will be without taking the manifold cat off the head, disconnect the manifold cat at the exhaust donut, remove upstream o2, using double garbage bags immerse cat in the Citric Acid/warm water mix, duct tape the bag to the cat, go to bed. Come out in the morning, try rinsing somehow, let it drip dry, put it back together. Maybe let the car steam dry the media, might clean out farther down.


Edited by LeakySeals (12/04/11 06:49 AM)
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02 Camry XLE 2AZ-FE 352k M1 HM 5w30 (RIP, broke pist rod 7/2/2016)
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#2452793 - 12/04/11 12:35 PM Re: Fixing Bad Catalytic Converters With P0420 [Re: 55Test]
Vikas Offline


Registered: 07/22/05
Posts: 10503
Loc: NorthEast
Scotty also recommends paint thinner (or was it Acetone) in the gas tank to clean the converter.

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#2453365 - 12/04/11 10:27 PM Re: Fixing Bad Catalytic Converters With P0420 [Re: 55Test]
brianl703 Offline


Registered: 05/07/04
Posts: 10491
Loc: Manassas, VA
How about putting it in a self-cleaning oven?

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#2453424 - 12/05/11 12:04 AM Re: Fixing Bad Catalytic Converters With P0420 [Re: brianl703]
91344George Offline


Registered: 11/23/11
Posts: 1082
Loc: CA
Originally Posted By: brianl703
How about putting it in a self-cleaning oven?


You need something to "wash away" the contaminants really, in a sense when you drive you are already baking the metals...

It has to be something that has a chemical reaction more than just heat.

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#2453599 - 12/05/11 08:56 AM Re: Fixing Bad Catalytic Converters With P0420 [Re: 55Test]
brianl703 Offline


Registered: 05/07/04
Posts: 10491
Loc: Manassas, VA
Lot more oxygen in a self cleaning oven so the contaminants will burn up much better.

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#2453685 - 12/05/11 10:48 AM Re: Fixing Bad Catalytic Converters With P0420 [Re: brianl703]
Vikas Offline


Registered: 07/22/05
Posts: 10503
Loc: NorthEast
Originally Posted By: brianl703
How about putting it in a self-cleaning oven?


Is your marriage worth more than the cat? If so, don't do it :-)

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#2453710 - 12/05/11 11:29 AM Re: Fixing Bad Catalytic Converters With P0420 [Re: Vikas]
HerrStig Offline


Registered: 08/24/11
Posts: 7949
Loc: Boston, MA
New cats for NON- "CARB" (Federal) cars are not that expensive. Try Rockauto. There's still a half dozen states where you don't NEED an emissions test, Florida among them. For the rest it's "monkey see, monkey do" like Maine.

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#2453716 - 12/05/11 11:34 AM Re: Fixing Bad Catalytic Converters With P0420 [Re: 55Test]
HerrStig Offline


Registered: 08/24/11
Posts: 7949
Loc: Boston, MA
BTW I have a Gen 4 Camry in the "fleet" with a blown out front - in the manifold - converter (by observation) but a good quality rear converter. The sensor which "rats you out to the ECU" and turns on the Check Engine light is behind the rear converter. No OBDII check engine light problems, and the rear conveter is not that expensive, even Amazon has them. It's passed two PIMA inspections in my state, where they hook a computer right to the OBD port. The front O2 or A/F sensor usually right on the manifold or down pipe is for the mixture setting feedback loop, , the rear one is the smog cop.


Edited by HerrStig (12/05/11 11:38 AM)

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#2453982 - 12/05/11 04:16 PM Re: Fixing Bad Catalytic Converters With P0420 [Re: HerrStig]
LeakySeals Offline


Registered: 02/18/11
Posts: 5292
Loc: MA
Originally Posted By: HerrStig
BTW I have a Gen 4 Camry in the "fleet" with a blown out front - in the manifold - converter (by observation) but a good quality rear converter. The sensor which "rats you out to the ECU" and turns on the Check Engine light is behind the rear converter. No OBDII check engine light problems, and the rear conveter is not that expensive, even Amazon has them. It's passed two PIMA inspections in my state, where they hook a computer right to the OBD port. The front O2 or A/F sensor usually right on the manifold or down pipe is for the mixture setting feedback loop, , the rear one is the smog cop.


They also have the ECU programmed to reject aftermarket manifold cats wink
_________________________
02 Camry XLE 2AZ-FE 352k M1 HM 5w30 (RIP, broke pist rod 7/2/2016)
06 Escalade 135k. M1 5w30

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#2454092 - 12/05/11 06:30 PM Re: Fixing Bad Catalytic Converters With P0420 [Re: L_Sludger]
MarkM66 Offline


Registered: 10/19/10
Posts: 1390
Loc: stl
Originally Posted By: L_Sludger
A good fix for P0420 is a couple of spark plug anti-foulers screwed into the post-cat O2 sensor bung, with the O2 sensor screwed in at the end.


Exactly!

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#2455249 - 12/06/11 08:05 PM Re: Fixing Bad Catalytic Converters With P0420 [Re: HerrStig]
artificialist Offline


Registered: 09/23/07
Posts: 8187
Loc: Florida
Originally Posted By: HerrStig
BTW I have a Gen 4 Camry in the "fleet" with a blown out front - in the manifold - converter (by observation) but a good quality rear converter. The sensor which "rats you out to the ECU" and turns on the Check Engine light is behind the rear converter. No OBDII check engine light problems, and the rear conveter is not that expensive, even Amazon has them. It's passed two PIMA inspections in my state, where they hook a computer right to the OBD port. The front O2 or A/F sensor usually right on the manifold or down pipe is for the mixture setting feedback loop, , the rear one is the smog cop.


That is because on most of those cars the front one is designed to work best while the engine is cold, afterwards, the one downstream does the majority of the work when the engine is hot. This is why sometimes the upper can fail, yet still pass a smog test.

However, on some cars, the one closer to the cylinder head is for NOX only, and the one downstream is for HC+CO only, but the oxygen sensor positioning is the same. This is more common on Fords. Secondary O2 sensors detect the conversion of HC+CO-> CO2 H20 but not NOX, typically. You might end up with no code P0420, but if the car was hooked up to an exhaust gas tester, you could fail the NOX test.
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2010 Lancer Ralliart Sportback

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#2455406 - 12/06/11 11:24 PM Re: Fixing Bad Catalytic Converters With P0420 [Re: 55Test]
KeithS_NW_Ohio Offline


Registered: 09/26/07
Posts: 144
Loc: Bowling Green, OH

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