Low compression

Hello I have a 1994 2000 Renaul Laguna. Taques. Thank you very much for your information.

Yes, valves can be regulated.
The valve adjustment is as follows:
1- Admission: 0.20 mm with cold engine.
2- Exhaust: 0.40 mm with cold engine.

The best way to decarbonize the valves is to draw the cylinder head and clean it.

luck

Hello .... Look, first you should see how the valve seats are ... It may be the low compression for loss in said compression for bad closure of the valves, whether seats, guides, the valves themselves ... not just a record of valves will serve you ... as Guillermo tells you, for all this I tell you, you have to remove the cylinder head. Well, surely you have the problem, in the combustion camera.