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Honda engines would not have any problem with oil leaking from the head gasket. If it is from the front end, ie near the timing belt side, most likely source would be the camshaft seals or valve cover gasket near the camcarriers. During installation, sealant have to be applied at the corners of the valve cover gasket to prevent leaking.
For exhaust fumes to smell strongly of gas, there are many possible causes.
If the injectors are dumping in too much gas, the spark plugs would be sooty and you would have erratic idling issues. Starting would be affected as well.
A bad catalytic converter, O2 sensor, Throttle Position Sensor, clogged air filter, fuel pressure regulator ( this item seldom fails for Honda), clogged fuel return hoses are some of the possible items.
Piston rings can go bad at high mileages so is a possibility with your case but after replacement of the valve seals, do you still have oil consumption issues? Do you have a lot of grey exhaust smokes at high rpm?
If too much fuel is being dumped into the cylinders and cleaning up the piston rings, you would have compression and difficult or non starting issues.
Note : I have seen very few honda engines with problem on pistons rings.
Is the performance of the engine as good or better than replacement of the valve seals and head gasket?
Recheck the timing belt installation. A off time cog can cause erratic idling and strong exhaust fumes and performance issues.
Friday, April 30th, 2010 AT 11:04 PM