Cleaning Catalytic Converters

Henman

Buick Newbie
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Buick
By rights this should be placed in general discussions but I cannot get my thread in there😢
I have a 2005 Allure CXL with the typical PO420 code displayed and searching through this forum I ran across using O2 senser spacers with limited or questionable success and from time to time I have watched YouTubes such as this

showing the use of Laquere thinner and in this vid Scotty uses one gallon of Thinner for half a tank. Has anybody tried this with success? The comments below his vids show many end up with the dreaded PO420 code gone and passing California emissions tests👍 Some mention the Thinner didn't work but removing and cleaning with soap did. Of course another fellow attempted to debunk Scotty's method but he didn't follow Scotty's instructions and only used a quart instead of a gallon! Many who commented on the "myth buster" mentioned "you didn't follow the instructions and only used a fraction of the Thinner!!"
Other than Scotty having thinning hair in the front😖like I'm experiencing does Scotty's cleaning method work?
Yes I did replace O2 sensors which didn't work as a result of taking it to a local fly by night garage where the idiot walked up to my car that was sitting for a half hour during winter, plugged the scanner in and had it idling and said you need new sensors! I should have given the finger and walked away because he didn't "light up the converter" or have the engine revving at 2500 RPM for a number of minutes to get the converter at proper operating temperature!! A total waist of money, unnecessary parts replacement and the return of the code! All that idiot knows is how to take a customers money.
 

2007LucerneCXL

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Illinois
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2007 Lucerne CXL. and 1995 Lesabre currently, past 1973 Riviera, 1968 Riviera
Cataclean is one of the better in tank cleaners, but not sure if it's going to cure the problem if the convertor is not operating correctly and is plugged.
 

Henman

Buick Newbie
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Buick Ownership
Buick
Not plugged just slightly below new spec. I can drive for hours continuously on highway and all's fine. Drive for days in my small town and all's fine. Drive in rush hour city traffic Bing on comes the $light! Garbage because exhaust doesn't smell rotten car is good on gas and that damn PO420 code😡
Nothin but a damn cash grab as we get cornholed because the Cat is 94% instead of %100. The upstream shows normal activity and the downstream shows slow very slight activity. The most maddening thing about that stupid code is it can be a number of faults or nothing worth justifying replacement.
 

2007LucerneCXL

Full Member
2,190
649
113
Illinois
Buick Ownership
2007 Lucerne CXL. and 1995 Lesabre currently, past 1973 Riviera, 1968 Riviera
Unless you are going to take it to a qualified shop for additional dianogist, then going with the Scotty method and hope for the best is one solution. Let us know how it turns out.
______________________________
 

Sstevieboy0208

Buick Newbie
35
5
8
Cincinnati Ohio
Buick Ownership
2011 Buick Lacrosse
By rights this should be placed in general discussions but I cannot get my thread in there😢
I have a 2005 Allure CXL with the typical PO420 code displayed and searching through this forum I ran across using O2 senser spacers with limited or questionable success and from time to time I have watched YouTubes such as this

showing the use of Laquere thinner and in this vid Scotty uses one gallon of Thinner for half a tank. Has anybody tried this with success? The comments below his vids show many end up with the dreaded PO420 code gone and passing California emissions tests👍 Some mention the Thinner didn't work but removing and cleaning with soap did. Of course another fellow attempted to debunk Scotty's method but he didn't follow Scotty's instructions and only used a quart instead of a gallon! Many who commented on the "myth buster" mentioned "you didn't follow the instructions and only used a fraction of the Thinner!!"
Other than Scotty having thinning hair in the front😖like I'm experiencing does Scotty's cleaning method work?
Yes I did replace O2 sensors which didn't work as a result of taking it to a local fly by night garage where the idiot walked up to my car that was sitting for a half hour during winter, plugged the scanner in and had it idling and said you need new sensors! I should have given the finger and walked away because he didn't "light up the converter" or have the engine revving at 2500 RPM for a number of minutes to get the converter at proper operating temperature!! A total waist of money, unnecessary parts replacement and the return of the code! All that idiot knows is how to take a customers money.
Let me know if this work for you please asap. I'm getting the same codes
 

Rich B.

Active member
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60
28
Minot, ME
Buick Ownership
2016 LaCrosse & 2013 Boss 302 Mustang
Something as such just may work. Not sure about the newer brick design converters but the old monolith style perhaps? The thinner I’d imagine would increase the after burner effect to burn off contamination.

And way back they had the air pump to add extra oxygen to the exhaust for converter🤪
 

Sstevieboy0208

Buick Newbie
35
5
8
Cincinnati Ohio
Buick Ownership
2011 Buick Lacrosse
Something as such just may work. Not sure about the newer brick design converters but the old monolith style perhaps? The thinner I’d imagine would increase the after burner effect to burn off contamination.

And way back they had the air pump to add extra oxygen to the exhaust for converter🤪
My question is if it's safe for direct injection engines
 

Rich B.

Active member
385
60
28
Minot, ME
Buick Ownership
2016 LaCrosse & 2013 Boss 302 Mustang
I wonder? Direct injection is relatively new (in use that is for gasoline cars), converter shouldn’t of gone bad that quick. I’d look for another simple problem tied in with what might be throwing codes.

Very likely those are covered under extended warranty also, long after all others have expired. How close is thinner to fuel injector cleaner, maybe same stuff?
______________________________
 

Sstevieboy0208

Buick Newbie
35
5
8
Cincinnati Ohio
Buick Ownership
2011 Buick Lacrosse
I wonder? Direct injection is relatively new (in use that is for gasoline cars), converter shouldn’t of gone bad that quick. I’d look for another simple problem tied in with what might be throwing codes.

Very likely those are covered under extended warranty also, long after all others have expired. How close is thinner to fuel injector cleaner, maybe same stuff?
I think that they get a little dirty so I think I will try that to clean it considering that the car actually run and drive fine. Just a very slight rough idle so maybe that will fix it.
If someone used it let me know about the results
 
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