Repeated burned exhaust valves -94 GS
I've had this 94 DOHC GS since rolling out of the showroom in 93. Burned first exhaust valve @ about 120k. Now I get one about every 20 - 30k miles.
Now have 250k miles
Just burned another exhaust valve (4th time) random cylinders..
I have used 2 different machine shops
I have used Mitsu valves and aftermarket from one of the shops
Never overheated
Runs a little rich (a little smut at exhaust pipe)
Using prem. fuel as required
Being OBD I ....I haven't run codes yet. MIL comes on sometimes w/ city driving but resets off on the open road (OBD I inspection not required in my area)
Could the EGR (maybe stuck open) cause extra heat / these valves to fail?
Thanks for any help!!....I'm "burned-out" on this...