Has any one try lacquer thinner? I've seen where Scotty Kilmer says to try one gallon of thinner to a half a tank of gas. Can it damage rubber and plastic components in the fuel system? I got codes PO420 and PO430 and the shop said it needs new cat. $$$

 

Let’s put the chemicals away and figure out why the cats got to that point.

Could be age and the catalyst is exhausted…could be that your mystery vehicle with unknown miles is running poorly and wrecked them thanks to infinite misfires.

 

my sign truck does show up? 01 f150 xlt 220,000. I dropped of the truck at the shop to see why. they said truck runs great besides these codes. O2 are running good. No miss fires, plenty of power. No black smoke . doesn't smell like rotten eggs. I did noticed that the front of the converters is 100 degrees hotter the behind the converters. Doesn't burn oil, and doesn't use and coolant.

 

Absolutely. What a stupid suggestion.

 

Seems to be a myth

 

LOL

 

Once the advanced coating is gone, substrate cakes right up.

Raw gas and Sea foam fails burn that coating off. Cat is pretty much no good after. Age eventually burns that off as well, cat becomes a carbon magnet.

Either replace with something, or use a long 3/4" auger bit and drill them out.
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Another option, cut them all off and replace w/Magnaflow HF's. Scrap yard gave me 160 for my old cats, the Maggy HF's were 180 for both. Cheap fix using the good stuff.

 

Do you mean one option is to replace with 2 Magnaflow convertors and leave the resonators off?

 

Anyone replacing bad cats should remove the lower intake, manifold then clean the carbon build up out, basically a good induction cleaning is what you'd want. Check the fuel injectors for leaking, remove the fuel tank then clean it thoroughly, then replace the pump and/or strainer, breathers.