Originally Posted By: vo_marz
does it say anything about cleaning soot off the exhaust system / catalyst?
soot off of the exhaust system is irrelevant to that of any form of cleaners, for it's related to the following:
(1) lots of cold starts and hard acceleration before your gasoline engine warms up to normal operating temp (closed-loop), it will be running cold+rich and any unburned or partially burned gasoline with a cold (non operating temp cat) will ended up as soot on your tailpipe.
The only way to minimise soot is to accelerate slowly after a cold start.
(2) dry soot means too rich of the exhaust, mostly due to frequent hard acceleration when engine still cold; oily soot indicates oil burning issues in your IC engine, not related to fuel-injectors.
CAT cannot be cleaned with any additives from what I understand. As those precious metal becomes poisoned over time (due to gasoline-related additive poisoning, oil burning engines, etc.) will eventually rendered ineffective. The only way to deal with this is to promptly replace the CAT with a new one (factory or aftermarket).
PEA is particularly effective in ported fuel injection intake portion of the fuel injectors and intake valves, etc. Once it gets into the combustion chamber and gets burned along with the gas+air mixture, it should be "spent" so no more cleaning possible as the exhaust gas exited out from the exhaust port.
Q.
