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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 07-27-2014, 05:08 PM   #1
M3_Power_Hustle
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New Radiator Blew Exp. Tank...Blown Head Gasket? Tried everything.

Alright so, I finally have to get some consulting. My 2001 Laguna M3 has had about half of its power for a couple of months. It's not ignition coils, it's not any of the sensors. A lot of the time when driving, especially in high heat and I accelerate too quickly (anything above 1 gear/10mph, so lame) the car will go straight into limp mode which is more like dead mode...I can flip the ignition quickly while driving and it'll reset to normal, and then happen again, and again and....

Codes all are reading like it's a timing issue. Misfires on all cylinders, Timing both retarded and advanced, Cam Pos Sensors (intake and exhaust - both replaced), vanos solenoid pack (purchased from Beisan) and while all of these things have made improvements, the car still runs like a P0$ Lada through a Russian village . I'm stuck at either a blown head gasket or the timing has been completely thrown off (no reasoning for this though). Awhile back I had to replace the radiator, however trapped air inside of it led to a blown up expansion tank upon install. Issues didn't start until a little bit after that. No evidence of coolant/oil incest, no white smoke anywhere. You guys think it could either be a blown head gasket or completely off timing? Either way I'm not too worried about the work, I work on M3s all day, currently doing a rebuild from an auctioned 02 M3, which I found to have completely bent connecting rods. It's a blast. So, what do you guys think?
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Old 07-27-2014, 07:14 PM   #2
ddaniel1
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What does a scan look like, what are the codes?
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Old 07-27-2014, 11:17 PM   #3
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Timing must be off, check the marks and let us know!
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Old 07-27-2014, 11:45 PM   #4
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How were your exhaust hub tabs and cam bolts? The bolts being loose could throw off timing.
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Old 07-28-2014, 12:38 PM   #5
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Find a real BMW mechanic. Ask for recs from members of the local chapter of the BMWCCA. Every chapter has a website.


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Old 07-29-2014, 01:51 PM   #6
M3_Power_Hustle
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Are you talking about the exhaust hub tabs in the vanos sprocket? And the camshaft camshaft bolts, you're referring to correct? I'll check that out. As far as the marks on the timing, are we talking camshaft alignment marks or the timing marks on the vanos sprockets, because there are both...I'm thinking the actual camshaft alignment would be an ideal place to check.

Codes are as follows: P0304, P0012, P0303, P0305, P0300, P0302, P0014, P0012 P0301, P0306...lol...etc...
The ones that jump out at me are two pings, one at P0012 saying Intake Camshaft Pos Timing OVER-RETARTED, second ping P0014 saying Exhaust Camshaft Pos Timing OVER-ADVANCED.

So I think it's fair to say my timing is completely F'ed. I'm wondering though how this happened, because that could make the difference between me jumping into the head or me jumping into the VANOS, neither of which are walks in the park (though I've been into both on multiple M3s) it's just a B$%#@...I'm so baffled about this happening, because I've found little information about people with these seemingly unprovoked issues...
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Old 07-29-2014, 02:55 PM   #7
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i might sound ignorant here but I had issues similar to this and had to replace my MAF
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Old 07-29-2014, 03:28 PM   #8
ddaniel1
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"Are you talking about the exhaust hub tabs in the vanos sprocket? And the camshaft camshaft bolts, you're referring to correct?"
Yes, if those tabs are gone you will lose oil pressure to the VANOS system, shutting it down, that or the bolts will allow the cams to be in the wrong position. That is the first thing I would check.
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Old 08-10-2014, 11:20 PM   #9
M3_Power_Hustle
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Well I got into my vanos, the hub tabs were perfectly fine, the bolts were on tight, HOWEVER, and I've never heard of this happening to anyone, but the bearings and shells from the oil pump on the exhaust side had completely been regurgitated into the heart of the vanos. It's really incredible because the retaining clip that holds it all in place was still there. I found shearing of metal from the housing down near the bottom of the chain tensioner. Anyone heard of this happening? Also, this helped my problem a little bit, I even timed out the entire system, but I'm going in tomorrow to check the fuel pressure for further diagnosis.
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