E46 BMW Social Directory E46 FAQ 3-Series Discussion Forums BMW Photo Gallery BMW 3-Series Technical Information E46 Fanatics - The Ultimate BMW Resource BMW Vendors General E46 Forum The Tire Rack's Tire Wheel Forum Forced Induction Forum The Off-Topic The E46 BMW Showroom For Sale, For Trade or Wanting to Buy

Welcome to the E46Fanatics forums. E46Fanatics is the premiere website for BMW 3 series owners around the world with interactive forums, a geographical enthusiast directory, photo galleries, and technical information for BMW enthusiasts.

You are currently viewing our boards as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!

If you have any problems with the registration process or your account login, please contact contact us.

Go Back   E46Fanatics > Tuning & Tech > DIY: Do It Yourself

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!

Reply
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 07-21-2015, 08:16 AM   #1
skesque
Registered User
 
Join Date: Jul 2015
Location: Kent
Posts: 28
My Ride: 318ci N46
Engine louder/vibration at 3000rpm after Valve Cover Gasket change

Hi,

My car has a N46 engine.

I changed the valve cover gasket last night and 2 valve cover studs sheared and snapped, flat to the head.

The car idles smoothly and there are no issues at all rpms in neutral.

However, in gears, there is a noticeable bassy/ heavy feel/ vibration from roughly 2900 to 3500 rpm.

Im pretty clueless what the the reason for this is. Would really appreciate your input.

Thanks


Sent from my iPhone using Tapatalk
skesque is offline   Reply With Quote
Ads by Google

Guests, get your FREE E46Fanatics.com membership to remove this ad.
Old 07-21-2015, 09:19 AM   #2
Gus-CO
Registered User
 
Join Date: Apr 2015
Location: Denver
Posts: 73
My Ride: 323ci
it is most probably leaking vacuum through the bolts that were not used. You're gonna need to take the remaining parts out and replace with new studs... Yes.... won't be fun.
Gus-CO is offline   Reply With Quote
Old 07-21-2015, 09:29 AM   #3
skesque
Registered User
 
Join Date: Jul 2015
Location: Kent
Posts: 28
My Ride: 318ci N46
Thanks for the quick reply Gus-Co.

That what i was thinking too.

The studs (approx 5mm diameter) are pretty much flat to the head.

I feel like i would risk shearing the remaining studs as some were very hard go get on.

Would i be naive in trying to remove the 2 snapped studs by a 4mm screw extractor (drill bits) through the valve cover holes?

Thanks




Sent from my iPhone using Tapatalk
skesque is offline   Reply With Quote
Old 07-21-2015, 09:43 AM   #4
Gus-CO
Registered User
 
Join Date: Apr 2015
Location: Denver
Posts: 73
My Ride: 323ci
If you can clearly see the snapped studs, I see no problem. It's even better as the head is going to be protected from shavings.

Good luck and keep us posted!
Gus-CO is offline   Reply With Quote
Old 07-24-2015, 08:46 AM   #5
skesque
Registered User
 
Join Date: Jul 2015
Location: Kent
Posts: 28
My Ride: 318ci N46
Engine louder/vibration at 3000rpm after Valve Cover Gasket change

Hi Gus-Co,

After deliberating, i chose to book the car in at a local regular garage for them to extract the studs.

He said it would take half an hour and said although its high risk, they wouldn't damage the cylinder head.

Should i trust them? Specialist thread works are asking for too much money? Would the garage have insurance? I really can't afford for things to go wrong.

Thank you once again for your help


Sent from my iPhone using Tapatalk

Last edited by skesque; 07-24-2015 at 08:47 AM.
skesque is offline   Reply With Quote
Old 07-24-2015, 09:38 AM   #6
Gus-CO
Registered User
 
Join Date: Apr 2015
Location: Denver
Posts: 73
My Ride: 323ci
If it fails he just needs to put a helicoil in. Installing a helicoil is not harder than extracting the bolt and very low probability of going wrong.

About liability, I would barely trust a dealer in assuming any mistakes. An indy is totally hit & miss in my opinion. Again, there is little to go wrong. But there is always a chance.

Good luck!
Gus-CO is offline   Reply With Quote
Old 07-24-2015, 10:04 AM   #7
skesque
Registered User
 
Join Date: Jul 2015
Location: Kent
Posts: 28
My Ride: 318ci N46
That's very true.

What about the potential of them damaging the valve cover, or worse the cylinder head, with the drill they use?

Would that not lead to a huge repair cost?






Sent from my iPhone using Tapatalk
skesque is offline   Reply With Quote
Old 07-24-2015, 10:13 AM   #8
Gus-CO
Registered User
 
Join Date: Apr 2015
Location: Denver
Posts: 73
My Ride: 323ci
I can't envision anything going so bad that requires the head to be removed. So, short answer is no....

If the unlikely happens and the guy is able to damage it so much that it needs to be removed, fixing at a head shop will be less than $100. Labor to pull the head off though (with the necessary parts to be replaced involved) is about $2K.
Gus-CO is offline   Reply With Quote
Old 07-24-2015, 10:14 AM   #9
skesque
Registered User
 
Join Date: Jul 2015
Location: Kent
Posts: 28
My Ride: 318ci N46
Thank you very much, much appreciated


Sent from my iPhone using Tapatalk
skesque is offline   Reply With Quote
Old 07-27-2015, 11:10 AM   #10
skesque
Registered User
 
Join Date: Jul 2015
Location: Kent
Posts: 28
My Ride: 318ci N46
Hey, sorry to bother you again, but the car did not start today so i charged the battery using a battery charger. It started fine, but then after 10 minutes of running idle the EML light came on and the engine does not idle; it revs between 1-2k rpm by itself.

Any ideas what this could be? Coil? Sensor? Or the vacuum leak?

Thanks


Sent from my iPhone using Tapatalk
skesque is offline   Reply With Quote
Old 07-27-2015, 11:19 AM   #11
Gus-CO
Registered User
 
Join Date: Apr 2015
Location: Denver
Posts: 73
My Ride: 323ci
Get the code read at advance or any other auto parts... It still sounds as a vacuum leak.

A vacuum leak is almost always together with a EML light. The light trips when the short term fuel trim is too different than the long term, because a vacuum leak exists. Or because misfire is happening somewhere also because of too much air not accounted for, that got into the engine because of a vacuum leak.

Maybe before the leak was too small for the ECU to detect, and now it is substantial enough that it tripped the alarm.

Again, get the code checked to make sure it is vacuum related. if it is, you have nothing else to be concerned about....

If you use android, there is a cheap bluetooth scanner on ebay that works with an app called TORQUE. It gives you all basic information you need to solve most problems ECU related.
Gus-CO is offline   Reply With Quote
Old 07-27-2015, 11:25 AM   #12
skesque
Registered User
 
Join Date: Jul 2015
Location: Kent
Posts: 28
My Ride: 318ci N46
Would the vacuum leak be the cause of the self-initiated revving?

Thanks for the help again, truly very helpful.



Sent from my iPhone using Tapatalk
skesque is offline   Reply With Quote
Old 07-27-2015, 11:32 AM   #13
Gus-CO
Registered User
 
Join Date: Apr 2015
Location: Denver
Posts: 73
My Ride: 323ci
Not a problem! This is what the forum's for.

Self Revving is a characteristic of vacuum leaks, yes... if there is too much air entering the engine, it will inject more gas to burn that excess air. Otherwise the engine would run lean and potentially melt your pistons... If the leak is too big your engine would just accelerate to red line or shut off depending on how it is programmed (most likely it will shut off).

If the leak is small enough a little revving gets rid of the excess air momentarily, then it builds up again and the ECU sends more gas and cleans it, then it builds up again and the ECU accelerates to gt rid of it and so on......

Last edited by Gus-CO; 07-27-2015 at 12:13 PM.
Gus-CO is offline   Reply With Quote
Old 07-28-2015, 03:09 AM   #14
skesque
Registered User
 
Join Date: Jul 2015
Location: Kent
Posts: 28
My Ride: 318ci N46
Is it possible for the garage to drill through the valve cover bolt into the water jacket? Im feeling fairly apprehensive


Sent from my iPhone using Tapatalk
skesque is offline   Reply With Quote
Old 07-28-2015, 08:35 AM   #15
Gus-CO
Registered User
 
Join Date: Apr 2015
Location: Denver
Posts: 73
My Ride: 323ci
Be cool!

It's impossible to affect any passageways in the head. They are like 4" below that level.
Gus-CO is offline   Reply With Quote
Old 07-28-2015, 07:18 PM   #16
skesque
Registered User
 
Join Date: Jul 2015
Location: Kent
Posts: 28
My Ride: 318ci N46
Haha thanks! Mechanic managed to get them out using a normal drill bit and extractors! All sorted. Now to address coolant leaks haha


Sent from my iPhone using Tapatalk
skesque is offline   Reply With Quote
Old 07-29-2015, 11:46 AM   #17
Gus-CO
Registered User
 
Join Date: Apr 2015
Location: Denver
Posts: 73
My Ride: 323ci
Cool! Is EML light gone?

Don't fool around with coolant leaks.. I just had to redo my wife's 323 head. NOT fun...
Gus-CO is offline   Reply With Quote
Old 07-29-2015, 12:54 PM   #18
skesque
Registered User
 
Join Date: Jul 2015
Location: Kent
Posts: 28
My Ride: 318ci N46
Engine louder/vibration at 3000rpm after Valve Cover Gasket change

Yeah the EML went by itself 30 minutes after first appearing before repair, the air suction intake duct/cover wasn't on at that point so could it have been that?

I've had coolant issues since ive bought this car, it overheated once for 1 minute and i got it towed. Changed upper hose twice at garages, radiator once. There's a leak in the upper hose for the third time so i bought a febi-bilstein hose i'm going to put on. But a mechanic told me a month ago i have a leak in the back of the engine water housing but im skeptical of his diagnosis. For now im filling water everytime i use it and no issues as of yet. Any ideas?


Sent from my iPhone using Tapatalk

Last edited by skesque; 07-29-2015 at 12:55 PM.
skesque is offline   Reply With Quote
Old 07-29-2015, 01:13 PM   #19
Gus-CO
Registered User
 
Join Date: Apr 2015
Location: Denver
Posts: 73
My Ride: 323ci
How many miles?

I think it is really good practice to overhaul the whole system at 100Kish. I bought everything BEHR or OEM and did not regret. It is a 400+ investment on parts, but it is worth, especially if you are note taking the head apart if it overheats too much (like a blown pipe I had, stopped right away but with absolutely no coolant the damage was great). Taking the head apart will run you $450 if you do it by yourself, a shop will charge $2k,,,
Gus-CO is offline   Reply With Quote
Old 07-29-2015, 01:43 PM   #20
skesque
Registered User
 
Join Date: Jul 2015
Location: Kent
Posts: 28
My Ride: 318ci N46
Engine louder/vibration at 3000rpm after Valve Cover Gasket change

Over here it costs more in . Ill change the upper hose and see how bad the leak remains?

Is taking apart the head a repercussion of overheating the engine? Dont these aluminium engines completely fail/become useless if they overheat too long?

Thanks
Sent from my iPhone using Tapatalk

Last edited by skesque; 07-29-2015 at 01:45 PM.
skesque is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Censor is ON





All times are GMT -5. The time now is 07:23 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2015, vBulletin Solutions, Inc.
(c) 1999 - 2011 performanceIX Inc - privacy policy - terms of use