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Old 09-03-2017, 08:46 AM   #31 (permalink)
V8 guy
 
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Join Date: Jul 2011
Location: NewMexico (USA)
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Sub - '84 Chevy Diesel Suburban C10
SUV
90 day: 19.5 mpg (US)

camaro - '85 Chevy Camaro Z28

Riot - '03 Kia Rio POS
Team Hyundai
90 day: 30.21 mpg (US)

Bug - '01 VW Beetle GLSturbo
90 day: 26.43 mpg (US)

Sub2500 - '86 GMC Suburban C2500
90 day: 11.95 mpg (US)
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Palladium is at like a 16 or 17 year high.
Platinum is coming off like a 5 year low of 900 an ounce. I bought a few ounces, so I'm watching the price.

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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
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Xist (09-03-2017)
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Old 09-15-2017, 05:10 AM   #32 (permalink)
Ecomuggler
 
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Join Date: Jun 2012
Location: Mesa, AZ
Posts: 5,149

Chorizo - '00 Honda Civic HX, baby! :D
90 day: 40.43 mpg (US)

Mid-Life Crisis Fighter - '99 Honda Accord LX
90 day: 35.09 mpg (US)
Thanks: 3,101
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I tried to find more information on this method.

3,000 miles before code: https://priuschat.com/threads/acid-b....166554/page-3
12,800 miles before code: https://www.tacomaworld.com/threads/...d-wash.241619/
18 months and no code: (All Years) Catalytic Converter Citric Acid Bath P0420 - Subaru Forester Owners Forum
Almost 30,000 miles without a code: P0420 / P0430 and a "Hail Mary Pass" (the "cat washing" thread) - Page 12 - Toyota Tundra Forums : Tundra Solutions Forum
BamZipPow ran it through the dishwasher and has not had a code for 41,000 miles: Catalytic converter cleaning...would you do it?
480 miles and disappered: https://www.bobistheoilguy.com/forum...topics/3391904
Tried a few things, without clear results: https://forum.ih8mud.com/threads/cat....833570/page-2
Attempted, but did not report back: (All Years) P0420 Catalytic Citric Acid Bath (How To) - Subaru Forester Owners Forum

Who knows how accurate any of this is, but there is indication that 50% of people who try this see clear benefits, but unfortunately, it seems like hardly anyone followed the directions perfectly.
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California98Civic (09-15-2017)
Old 09-15-2017, 05:24 AM   #33 (permalink)
V8 guy
 
oil pan 4's Avatar
 
Join Date: Jul 2011
Location: NewMexico (USA)
Posts: 4,905

Sub - '84 Chevy Diesel Suburban C10
SUV
90 day: 19.5 mpg (US)

camaro - '85 Chevy Camaro Z28

Riot - '03 Kia Rio POS
Team Hyundai
90 day: 30.21 mpg (US)

Bug - '01 VW Beetle GLSturbo
90 day: 26.43 mpg (US)

Sub2500 - '86 GMC Suburban C2500
90 day: 11.95 mpg (US)
Thanks: 103
Thanked 1,144 Times in 841 Posts
Try hydrochloric.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
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Old 09-15-2017, 11:43 AM   #34 (permalink)
Ecomuggler
 
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Join Date: Jun 2012
Location: Mesa, AZ
Posts: 5,149

Chorizo - '00 Honda Civic HX, baby! :D
90 day: 40.43 mpg (US)

Mid-Life Crisis Fighter - '99 Honda Accord LX
90 day: 35.09 mpg (US)
Thanks: 3,101
Thanked 865 Times in 644 Posts
This seems to indicate HCL would not provide the results I desire: Using Dilute HCl/Cl to Process Catalytic Converter - Gold Refining Forum.com
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Old 09-15-2017, 12:52 PM   #35 (permalink)
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Join Date: Mar 2011
Location: Coastal Southern California
Posts: 4,141

Black and Green - '98 Honda Civic DX Coupe
Team Honda
90 day: 61.78 mpg (US)

Black and Red - '00 Nashbar Custom built eBike
90 day: 3671.43 mpg (US)
Thanks: 1,473
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Quote:
Originally Posted by Xist View Post
I tried to find more information on this method.

... 18 months and no code: (All Years) Catalytic Converter Citric Acid Bath P0420 - Subaru Forester Owners Forum...
I think that Subaru link is one of the dudes I was copying in my citric acid bath cleaning. FWIW, thirteen months later and no emissions related codes (no codes at all, acutally). But I did not have a code to begin with. I had reason to suspect my 1998 OEM catalytic converter might fail emissions and wanted to be prepared. I passed emissions, barely. Then I cleaned it.
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.


Last edited by California98Civic; 09-15-2017 at 12:53 PM.. Reason: thirteen months, not fifteen.
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Old 09-25-2017, 01:58 PM   #36 (permalink)
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Join Date: Jun 2012
Location: Mesa, AZ
Posts: 5,149

Chorizo - '00 Honda Civic HX, baby! :D
90 day: 40.43 mpg (US)

Mid-Life Crisis Fighter - '99 Honda Accord LX
90 day: 35.09 mpg (US)
Thanks: 3,101
Thanked 865 Times in 644 Posts
California98Civic was kind enough to share his cleaning supplies with me; I bought a 16 quart stainless steel stock pot for my larger Accord cat and put it on a hot plate for 10 hours. Unfortunately, the larger pot was still not deep enough, either I needed a much larger pot, much more water, and much more powder, or a turkey fryer pot. It did something, the water turned black. The water did not cover the electrolyte honeycomb, so I flipped it over halfway through, although since the sensors is in the middle I could have ignored the back half. Curiously, it ate one of my gaskets.
I did this at 179,270 miles.
http://ecomodder.com/forum/attachmen...1&d=1506362279
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California98Civic (10-12-2017)
Old 09-25-2017, 02:25 PM   #37 (permalink)
V8 guy
 
oil pan 4's Avatar
 
Join Date: Jul 2011
Location: NewMexico (USA)
Posts: 4,905

Sub - '84 Chevy Diesel Suburban C10
SUV
90 day: 19.5 mpg (US)

camaro - '85 Chevy Camaro Z28

Riot - '03 Kia Rio POS
Team Hyundai
90 day: 30.21 mpg (US)

Bug - '01 VW Beetle GLSturbo
90 day: 26.43 mpg (US)

Sub2500 - '86 GMC Suburban C2500
90 day: 11.95 mpg (US)
Thanks: 103
Thanked 1,144 Times in 841 Posts
Hmmm, HCl might work a little too well.
__________________
1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
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Old 10-12-2017, 07:27 AM   #38 (permalink)
Cyborg ECU
 
California98Civic's Avatar
 
Join Date: Mar 2011
Location: Coastal Southern California
Posts: 4,141

Black and Green - '98 Honda Civic DX Coupe
Team Honda
90 day: 61.78 mpg (US)

Black and Red - '00 Nashbar Custom built eBike
90 day: 3671.43 mpg (US)
Thanks: 1,473
Thanked 1,151 Times in 765 Posts
Quote:
Originally Posted by Xist View Post
... The water did not cover the electrolyte honeycomb, so I flipped it over halfway through, although since the sensors is in the middle I could have ignored the back half. ...
[imgl]http://ecomodder.com/forum/attachment.php?attachmentid=22756&stc=1&d=15063622 79[/img]
This is great. I am glad there has been no CEL for nearly 2000 miles, too! My pot was also on the small side. But the honeycomb was completely submerged for me. And I used a ladel or something to move sort of baste the top of the honeycomb. Did you monitor solution temperature at all? It is not supposed to boil, but they recommend a pretty high temperature.

__________________


See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.

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