PEA additives and EGR cleaning without removal

I went trough the egr cleaning back in 2020 on my then 160k km prius, it took me aroud 8 hours of long, dirt and tedious work.

Afterwards I poured a can of Techron in the tank every 6 months.

After 4 years, last week, I performed the egr active test.

At step 10 the idle started to slow down
At step 15 the engine started misfiring.

According to other prius chat threads the above results are a sign that there is no egr flow restriction and it performs nearly like a new one, it seems that Techron did quite a good job at keeping the egr clean.


There are many injection cleaners around, but the most effective are the PEA based ones.
They are used to clean up carbon deposits from injection, valves and egr.
According to wikipedia, PEA also called polyetheramine, is a cathalyst found in epoxy hardener.

I have compared viscosity and colour of Techron and epoxy hardener an they look very much alike.

I wonder if anyone has ever tried to pour epoxy cathalyst in the fuel tank

 

at the moment 265k km, I have updated the original post, in 2020 I had about 160k km, based on the fact I drive 25/30k km per year

 

The PEA is gassified during combustion, then exausted into the EGR, heat will double the reaction speed every 10 degrees of temperature increase according to Arrhenius Equation.
According to Techron and Wynn's, once burned, it will break down carbons build up anywhere it passes trough ingluding EGR and cathalytic converter

 

Reactions at room temperature inside the fuel tank are negligible, as soon as the fuel pea mixture ignites reactions speeds up twice every 10 degrees temperature increase, transforming carbon into ash down stream the injector, but not upstream.

 

I've just taken the intake and egr pipe off, I wouldn't eat in it, but the build up isn't that bad, maybe as thick as a paper sheet. The valve stems looks ok, port injection does a pretty good job at keeping them carbon free.