"I am the original owner of a 2001 Isuzu Trooper with the 3.5 liter V6 engine. The vehicle has approx. 135K miles as of 12/2016.
My check engine light came in in the spring of 2016 with the OBD code showing insufficient EGR flow. This was causing the computer to think the engine was running lean, so it was dumping more fuel into the cylinders to richen up the fuel mix. This dropped my mileage from approx. 18 highway down to about 10MPG and was costing me a lot of money in gas and I was only getting about 200 miles in range out of a 20 gallon tank (combined highway and city driving)
I tried numerous times to clean the EGR valve and tubes with various chemicals including Seafoam, carb cleaner and others. I replaced the EGR valve, I removed and cleaned the throttle body and reamed the cleaned out the EGR tube inside the manifold, none of which worked.
While researching online, I came across some old school decarbonization methods, including water injection into the air intake, and further Googling led me to learn about HHO carbon cleaning. I drove down to another part of Florida and had the HHO treatment done and over the next few weeks, my check engine light went off several times, but then came back on. I learned this was to be expected as the loosened carbon worked it's way out of my engine.
6 weeks after the treatment, I took a long road trip of about 2500 miles, and after approx. 200 miles at the beginning of the trip, my check engine light went out and has stayed out for the last two months. Since then, my vehicle has been running almost like when I bought it new and my mileage has increased back up the original 18MPG highway rating. I have much better acceleration and the truck runs fantastic. I am now getting approx. 350 miles in range out of my 20 gallon tank.All in all, I am extremely pleased about the results of the treatment I received from Carbon Cleaning USA and would recommend it highly to anyone who drives a car, truck or uses marine engines. "
"We had 5 cars cleaned and each one seemed to show improvement in power and economy. The C6 which also required a new fuel filter is delivering 34.9 MPG which is about 3-4 more miles per gallon than before. It also seems to have more acceleration. The car has 78,000 miles. My Mercedes S500 2002 with 120,000 miles seems to run better as well. We are still evluating, but the preliminary results seems positive. The good part about this is that the treatment does not require any disassembly of the engine. If possible, I would suggest that you have them demonstrate by treating an older car where you can then take some of the parts out for inspection."