how common is it for exhaust valves to burn in these?
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This is a discussion on how common is it for exhaust valves to burn in these? within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; my recently purchased 03 wrx had #4 misfire continuesly...swapped coils no change] swapped pluggs no change....performed compression test...3-138/4-20 1-148/2-150 i ...

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    Registered User 1tunk5's Avatar
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    how common is it for exhaust valves to burn in these?

    my recently purchased 03 wrx had #4 misfire continuesly...swapped coils no change] swapped pluggs no change....performed compression test...3-138/4-20
    1-148/2-150
    i pulled motor and removed left head to find the rear most ex valve burndt about 5/8" but the inner valve was fine? is it common for just one valve to burn on these or is it just that once let go first?
    Attached Thumbnails Attached Thumbnails IMG_0343.jpg   IMG_0354.jpg  

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    Registered User EvoEatr's Avatar
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    Quote Originally Posted by 1tunk5 View Post
    my recently purchased 03 wrx had #4 misfire continuesly...swapped coils no change] swapped pluggs no change....performed compression test...3-138/4-20
    1-148/2-150
    i pulled motor and removed left head to find the rear most ex valve burndt about 5/8" but the inner valve was fine? is it common for just one valve to burn on these or is it just that once let go first?
    How many miles are on it? Im sure as you know the life of a boosted car is signifigantly harsher than that of a N/A one ( usually ). of the thousands of Subarus I have wrenched on I dont think I ever saw one burned valve, usually the higher mileage WRX's end up developing a misfire due to a tight valve. which in most cases requires replacement of the head fore valves just dont tighten up to the point of a dead miss. for no reason haha...

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