If you feel your Toyota VVTi engine low on power, one cause must be the combustion chamber’s tightness. And there are two things that can go wrong with it - loose valves or worn out piston rings.
Here we’ll see how you can check the valve tightness on a Toyota VVTi engine, which pretty much works in the same way as for other engines.
If you want to localize the problematic cylinder(s) faster, you can use a compression meter and check each one of them. But even if you found the problematic cylinder, you’ll still have to see if the pressure drop is caused by the valves or piston rings.
To check the valves for their tightness you’ll need to remove the camshaftscylinder head first. Then, you have to pour gasoline in each exhaust port and see if it comes out through any of the exhaust valves. Then you have to repeat the same operation for the intake ports. Check the video bellow to see how it’s done.
This is a DIY guide and, as such, you must be aware the procedures described here involve some risks. autoevolution cannot be held responsible for any possible damage that might result while following this guide.
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