92 Geo Metro Burned Exhaust Valves

In order to avoid burnt exhaust valves is very important that the valve end gap be adjusted properly. Over tight valves can not cool properly, since the heat transfer to the seat in the head is diminished. By the other way to lose valves are noisy and gives poor performance. The correct end gap is required for performance and durability. If taken to the shop let them check the seat for thickness and face angle, since is through the seat that the valve gets rid of the heat.

This is a common problem, but given the ease of working on the engine, not bad to deal with. Usually they burn the center cylinder exhaust valve. I have heard of people keeping a spare head laying around, ready to go on, for when it happens.

The CAT is stoped up, replace it or it will burn the valve out again.

this is a common problem..cure once you replace the three exhaust valves...advance timing to 10 degress befire top dead center..manual says 5..but thats for california specs..you will get better milage, and more power..keep the egr valve clean and the egr passages also..use noththing but 5w30 oil..anything heavier pumps up the lifters and they do not close all the way..buring the valves..i run mine 399 miles per day and have become pretty adept at all the maintience..don't drive over 65..these cars were not designed to run 75 mph on the highway..

Just helped the next door neighbor with his 90 geo metro, same
problem, number 1 cyl had a piece missing from the exhaust valve, #2
cyl had a distorted shape. He had 142,000 miles.
I did notice that he was missing one of his exhaust manifold bolts.
Don't know if this will cause burned exhaust valves or not.
He was also using 20W50 weight oil. I wonder if that heavy of an oil
and with hydraulic valve adjusters if the exhaust valve wouldn't seat
properly.

Took about 1.5 hours to disassemble everything. He took the head to
get fixed ($60 labor + 3 exhaust valves). Spent about 2 hours putting
it all back together. Easy engine to work on.

Shop around for labor prices. He was quoted from $60 to $200 just for
labor. Also, you don't need to replace the head bolts on this 3 cyl
engine.

Been running fine since (about 2 months ago). Don't know the cause.
Dave

yeah dudetake the head off and dont even bother with it...take it to an
engine shop..have em look it over...check to see if its warped wtcor even
better...spend a little more cash and get a rebuilt head and just slap it
onmake sure you changhe the seals and seats if you dont get a rebuilt one
Gus
'85 (Integra powered Civic 4wd) (Gone but not forgotten .))
87 VW GTI...Yes...Im finally a VDUbbeR

"I shagged her...I shagged her rotten"...Austin Powers (man of mystery)