How to clean Piston Rings my way

GM Upper Engine and Fuel Injector Cleaner p/n 88861802 (in Canada, 88861804) (fig. 6) replaces GM Top Engine Cleaner p/n 12346535 and p/n 1050002 (in Canada, 992872).



Use of lower quality fuels may leave harmful engine deposits that can degrade driveability. Some fuels may not burn cleanly or do not contain sufficient doses of deposit control additives, and can leave behind harmful deposits which can retard engine performance.

Characteristics of GM Top Engine Cleaner (TEC) -- TEC does not mix with gasoline containing 10% or more ethanol. Higher concentrations lead to ineffective fuel injector cleaning as explained in bulletin 03-06-04-030A. TEC must be be mixed with gasoline to perform the injector cleaning. TEC isn't VOC compliant in all 50 states. In the event it finds its way into the fuel tank due to return lines being ineffectively plugged off, TEC can affect epoxy sealer and viton gaskets.

Characteristics of NEW GM Upper Engine and Fuel Injector Cleaner (UEC) -- UEC is specially formulated to provide superior cleaning properties, meet VOC compliance, mix with fuels containing up to 30% ethanol, and not affect fuel system gaskets and seals.

UEC delivers immediate engine deposit cleaning. It has multiple service applications, including in-rail fuel injector cleaning, fuel induction system deposit removal and piston top soaking clean-up.

Refer to the illustrations for a cleaning comparison.



Fig. 7 Before



Fig. 8 Cleaned with TEC



Fig. 9 Before



Fig. 10 Cleaned with UEC

One treatment of GM Upper Engine and Fuel Injector Cleaner can deliver deposit clean-up of carburetors, fuel injectors (when used as a through-the-rail cleaner), intake valves and ports, and combustion chambers. Refer to GM Technical Service Bulletins for specific service procedures.

IMPORTANT: Do not add GM Upper Engine and Fuel Injector Cleaner into the fuel tank.

A bottle of GM VehicleCare Fuel System Treatment Plus p/n 88861011 (in Canada, 88861012) should be added to the fuel tank according to label directions after all applications of GM Upper Engine and Fuel Injector Cleaner.

My suggestion

1. Drain the oil first Not the filter.
2. Leave the drain plug out.
3. Blow off intake around the fuel injectors.
4. Remove the fuel injctors.
5. Add 2oz of the UEC to each cylinder through the injector holes.
6. 16oz bottle 8 cylinders.
7. Mark the balancer just as a reference.
8. Turn the crank 720° by hand.
9. This will push the cleaner into the piston ring lands.
10. If you do this from the bottum you will see the cleaner run out the oil pan.
11. Let the chemical set for 1 & 1/2 hours.
12. Add 2oz of UEC to each cylinder for a second time.
13. Turn the engine over 720° again by hand.
14. If you need to work it back and forth to get it to go over.
15. You should be close to or hydo lock on each cylinder.
16. Let sit another hour.
17. Spin engine over by hand until free. 720°?
18. Add 1 quart oil and let it drain out.
19. Install drain plug back into the oil pan.
20. Fill with oil.
21. Reinstall the fuel injectors.
22. Start the engine and let it idle until it reaches operating temp.
23. Drive the car in first and second gear keeping the RPM's above 3500 for 10 minutes.
24. Perform many WOT launches.
25. Change oil and filter.

Parts list
2 UEC
16 quarts of oil