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Old 09-27-2017, 02:16 PM   #1
MightyMat
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Angry Bent Exahust Valves



So...... I just bought a 04 330ci, car shifted and drove like a dream with 150k Km on it, body in great shape. anyways, I've come to realize after driving the car a check engine light popped on, and i ran the codes and got a misfire in 4&6, swapped plugs, coils, injectors all fine, compression is fine, so i brought it my local shop and the verdict is bent exhaust valves, now, is it worth it to swap the car with a new M54 and how much would it cost me for the motor or to have this current one rebuilt and labour or should i just say screw it and try to get rid of the car. would love a second opinion, also i would love to swap the motor myself as it would save tons of money but i don't have the know how to do it.

PS: if i posted this in the wrong place i'm sorry i'm a newbie.
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Old 09-27-2017, 02:20 PM   #2
BigD
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If compression is fine, so are the valves. Take it to a different shop. I recommend having Rob at Auto Evolution in Oakville look at it.
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Old 09-27-2017, 10:05 PM   #3
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I second that! It is impossible to have bent valves and have good compression...just NO! Sounds like they just want to sell you on something. Go to a different shop, and ask for a refund on the absurd diagnostic they just did.
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Old 09-28-2017, 12:07 AM   #4
jabela
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Yea, they're wrong. You wouldn't have compression and it wouldn't have driven well when you tested it.
A misfire could be as simple as a bad O2 sensor or excessive carbon build up, vacuum leak (very common). Try a Seafoam treatment.
RMP Motors is not too far from you so take it there if all else fails.
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Old 09-28-2017, 09:03 AM   #5
Dinanstu
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Skip the seafoam for now. Just go to RMP.
Bent exhaust valves will have 0 compression.
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Old 09-28-2017, 12:11 PM   #6
MightyMat
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Thanks EVERYBODY for the feedback, i appreciate it and will keep you posted!
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Old 09-28-2017, 10:48 PM   #7
Trekz
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What are you're compression #s? Do a cylinder leakdown test to make a
sure.

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Old 10-02-2017, 10:39 AM   #8
MightyMat
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So Exahust valves were bent, now its just a matter of getting the head re-done or swapping the motor. Leaning more towards just getting the valves redone and going from there.
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Old 10-02-2017, 11:05 AM   #9
jabela
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Quote:
Originally Posted by MightyMat View Post
So Exahust valves were bent, now its just a matter of getting the head re-done or swapping the motor. Leaning more towards just getting the valves redone and going from there.
Any idea how they were bent? Most likely an over-rev. Did you happen to let any of your friends drive it? Maybe they money-shifted.
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Old 10-02-2017, 09:29 PM   #10
Dinanstu
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You know right away when you over rev and fu** up the motor....ask me how I know!

Exhaust valves bent = money shift...

The cost to remove and rebuild can be pricey, I've done it, but that was for a Dinan packaged M3. You might want to source a used cylinder head?

Thoughts anyone?
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Old 10-02-2017, 10:53 PM   #11
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Quote:
Originally Posted by MightyMat View Post
So Exahust valves were bent, now its just a matter of getting the head re-done or swapping the motor. Leaning more towards just getting the valves redone and going from there.
In this aluminum block, not going to last very long! Better find a low milage motor.
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