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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
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Join Date: Apr 2013
Location: Milwaukee
Posts: 9
My Ride: Laguna Seca E46 M3
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
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Join Date: Nov 2011
Location: San Diego
Posts: 457
My Ride: 328i, M3, 525iT
What does a scan look like, what are the codes?

Last edited by ddaniel1; 07-27-2014 at 07:15 PM.
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Old 07-27-2014, 11:17 PM   #3
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Location: Socal
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My Ride: 328i, XC70
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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Location: San Diego
Posts: 457
My Ride: 328i, M3, 525iT
How were your exhaust hub tabs and cam bolts? The bolts being loose could throw off timing.
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Old Yesterday, 12:38 PM   #5
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Location: USA
Posts: 1,158
My Ride: 2001 330Ci
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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blown head gasket, misfire, timing

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