GDI Engine Intake Valve Deposit Cleaning Procedure
This procedure requires a moderate to high level of technical expertise. You should not
attempt this procedure until you have completely read this procedure and are thoroughly
comfortable in executing it. Failure to follow instructions can lead to personal injury and or
damage to engine.
Wear Safety Glasses, Gloves, and Protect All Skin Surfaces as necessary.
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Procedure will be most effective with engine hot.
1. Remove shrouds, covers, wiring, and hoses as necessary to access intake manifold.
2. Remove spark plugs.
3. Remove nuts and bolts then pull away or if necessary remove the intake manifold from
the block to allow access to intake ports (Note: In most cases pulling the manifold away
from the block will be sufficient).
4. Using a ratchet and socket (or other appropriate tool), rotate the engine until intake
valves in cylinder number 1 are closed. (This should also close intake valves in one
other cylinder)
5. Fill canister of 201145 Pressurized Tool with TerraClean GDI Intake Valve Cleaner and
reattach canister to the tool.
6. Attach tool to shop air and set air regulator to 20 psi, then install nozzle tool to liquid
hose.
7. With nozzle tool in the intake port of number 1 cylinder, slowly open liquid valve on
Pressurized Tool and carefully spray product into port until it is full of liquid, close valve.
8. Follow same procedure for the other cylinder that has the valves closed.
9. Wait five minutes (this will allow the chemical to work) and then using brass brush,
vigorously brush port area and valve stems in cylinder 1 intake port.
10. Do the same in the other cylinder.
11. Return to cylinder 1 and repeat vigorous brushing and then go back to the other cylinder
and do the same.
12. Vacuum all liquid from ports.
13. Inspect ports and valves (including valve stems) and if necessary repeat above
procedure until all deposits are removed.
14. Use shop air to blow out any remaining liquid and debris.
15. After ensuring that all liquid has been removed from both, rotate engine until intake
valves in the next cylinder in the firing order are closed. (This should also close intake
valves in another cylinder)
16. Follow steps 7 – 14 for the cylinders that have the valves closed.
17. Repeat this process until all ports have been cleaned.
18. After checking to be certain that all liquid and debris has been removed from all port
areas, reinstall intake manifold.
19. After checking to be certain that ratchet and socket have been removed, turn engine
over with starter to be certain no liquid is left in port or combustion chamber.
20. Reinstall spark plugs and then wiring, hoses, shrouds, and covers. 21. Add one bottle of Optima to fuel tank
22. Perform TerraClean Fuel System Cleaning and Engine Decarbonizing Service.
23. Clear codes if necessary and if applicable reset “Adaptation Values” to factory default.
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In cases where engine is cold it is very beneficial to use an electric heat gun to heat intake port
area prior to introducing chemical.
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Originally Posted by yungcotter
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