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					Zitat von  bluedog
					 
				 
				Don't confuse cylinder head gasket and valve cover seal. 
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 I didn't. May be just the term I used was not clear "head cylider cover seal"
let's just briefely summarize all the tests mentionned till now:
- Fuel octane booster
- Fuel pressure check
- Timing light test
- Engine scan
- New sparks (they are new from Daihatsu dealer, I'll try to send you the mode)
- Compression test
- Valve clarance inspection
Coming back later.