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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Fri, Jan-10-2020, 08:59:12 PM   #1
haas16
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Default likely blown head gasket?

Sorry if this is the wrong forum for this type of post!

Car developed or more likely got a more noticeable version of an abnormal noise. happens low in the revs on partial throttle. Here are two videos that try to show the sound. one at idle from the bay and the other from the cabin with load as well.

Researching shows me this is a likely head gasket issue. I have not noticed any smoke on start. Have not noticed any oil or coolant leaks. When I checked the dipstick oil seemed to be its normal color. This sound does occur in neutral but not right away; car has to be driven or revved for it to begin. I checked INPA for the first time and did not see any related codes.

My main questions are:
Is my diagnosis of a blown head gasket likely? Can I drive this car to have a compression/leak-down test done or should it be towed? Since this is happening in neutral is there likely to be severe wear on the head or even block? What is the best way to tell if there is cylinder or piston damage?

Thank you all, I hope this all made sense and I'm not sounding crazy
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Old Fri, Jan-10-2020, 09:06:07 PM   #2
Drewster
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Default Re: likely blown head gasket?

I would tow it to a shop - sounds like you might have a rod knocking on heaven's door..
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Old Fri, Jan-10-2020, 09:11:55 PM   #3
haas16
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Default Re: likely blown head gasket?

Quote:
Originally Posted by Drewster View Post
I would tow it to a shop - sounds like you might have a rod knocking on heaven's door..
oof not the news I wanted. what a day for my avin head unit to arrive
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Old Fri, Jan-10-2020, 09:13:28 PM   #4
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Default Re: likely blown head gasket?

I think you'd more likely hear pinging under load while in gear if you had a bad head gasket, other than the usual blue smoke on hard acceleration and oil in coolant. While a compression/leakdown test would be beneficial, I agree with Drewster that it sounds closer to rod knock...
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Old Fri, Jan-10-2020, 09:28:04 PM   #5
haas16
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Default Re: likely blown head gasket?

With the rod knock suggestions I wish i had a different title. Doing some quick reading people seem to debate rod knock sounds and vanos rattle. Can that be differentiated in this video or is there something else I could do?

Regardless with my whiff of a diagnosis towing to a shop to get a professional opinion is a must.

thanks again
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Old Fri, Jan-10-2020, 09:30:20 PM   #6
icecream
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Default Re: likely blown head gasket?

Quote:
Originally Posted by haas16 View Post
With the rod knock suggestions I wish i had a different title. Doing some quick reading people seem to debate rod knock sounds and vanos rattle. Can that be differentiated in this video or is there something else I could do?

Regardless with my whiff of a diagnosis towing to a shop to get a professional opinion is a must.

thanks again
Pop the filter and cut it open. If a rod os knocking, you will likely have metal in there.
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Old Fri, Jan-10-2020, 10:01:33 PM   #7
haas16
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Default Re: likely blown head gasket?

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Originally Posted by icecream View Post
Pop the filter and cut it open. If a rod os knocking, you will likely have metal in there.
Ok will do that within an hour or two and report back.

Have a new filter to replace it with for when I was gonna do my oil change and oil analysis soon
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Old Fri, Jan-10-2020, 11:01:03 PM   #8
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Default Re: likely blown head gasket?

Knock. Knock. Who’s there.

A rod.

Sorry OP. I hope I’m wrong.
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Old Fri, Jan-10-2020, 11:30:29 PM   #9
haas16
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Default Re: likely blown head gasket?

Quote:
Originally Posted by icecream View Post
Pop the filter and cut it open. If a rod os knocking, you will likely have metal in there.
https://imgur.com/a/UKlfa9Z

Heres the filter with a good look inside the folds. filled with gold glitter basically
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Old Fri, Jan-10-2020, 11:34:15 PM   #10
haas16
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Default Re: likely blown head gasket?

Quote:
Originally Posted by 02_LSB View Post
Knock. Knock. Whos there.

A rod.

Sorry OP. I hope Im wrong.
lol that got me. real gutted if it is a rod. Sad part is I have a blackstone oil kit and a fresh set of oil since i was going to check on this soon. Was only waiting on some parts from ecs tuning to realign front bumper cover at the same time which arrive Monday. Life can be cruel sometimes
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Discussing likely blown head gasket? in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)