Can you solve this puzzle? - BMW Forum - BimmerWerkz.com
1,6,7,8 - Series and Mini Cooper General Chat related to models that do not fit into particular categories above. Please try to put your discussion in more appropriate sections. This section does cover the 1 Series, MINI Cooper and 8-Series vehicles: BMW 830i, BMW 840Ci, BMW 850i, BMW 850Ci, BMW 850CSi, M8, Alpina B12, BMW CS Concept and others.

 
LinkBack Thread Tools Display Modes
#1 (permalink) Old 08-25-2004, 07:44 AM
n00b
 
Join Date: May 2004
Posts: 17
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
gm3mtm is an unknown quantity at this point
(Thread Starter)
I have made some improvements to the problem but here is the issue. The engine runs a bit rough for the first 20 to 30 seconds. So far i have replaced the following, some of which have helped improve the situation.....

new Pre cat O2 sensors
new mass air flow sensor
oil changed
fuel additive (barhdohls) ....seems to have helped
new fuel filter
new plugs
new cam positioning sensor


Of all of the above the oil change and the fuel additive seem to have helped the most.

Any other thoughts??

gm3mtm is offline  
Sponsored Links
Advertisement
 
#2 (permalink) Old 08-31-2004, 01:15 PM
n00b
 
slyhog-22056's Avatar
 
Join Date: Mar 2004
Location: Dallas / Ft Worth TX
Posts: 39
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
slyhog-22056 is an unknown quantity at this point
Send a message via Yahoo to slyhog-22056
I would be happy if mine only ran rough for a few seconds... I have to wait 2 to 3 minutes while heat builds in the engine before mine smooths out........

<a href='mailto:slyhog-22056@sbcglobal.net'>slyhog-22056@sbcglobal.net</a>
<span style='font-family:Impact'><span style='colorurple'>Wm. D. Cunningham</span></span>
My 1984 BMW 633 CSi Pictures:
http://www.roadfly.com/bmw/gallery/p...37076,1;-24,1;
slyhog-22056 is offline  
#3 (permalink) Old 09-04-2004, 02:25 PM
n00b
 
Join Date: Aug 2003
Posts: 8
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Wiseguy is an unknown quantity at this point
Bad intake mainfold seals/gaskets aka "oil separator plate".

Common on M60s and M62s
Wiseguy is offline  
#4 (permalink) Old 11-20-2004, 12:50 AM
n00b
 
Merlin4SC's Avatar
 
Join Date: Nov 2004
Location: LA,CA
Posts: 5
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Merlin4SC is an unknown quantity at this point
Exactly Wiseguy!

The puzzle is solved...

As heat build the intake mainfold blocks expand and seal off the leaks. Also, when the GT1 is reading out the fault codes from the OBDII, I bet it is always the same cylinders misfiring..

But you will get misfires until it does. To verify this take off the maifold cover and spray some Wurth silicone around the edges of the manifold - intake port connections and see if it doesnt smoothen out. This proves that you need to replace these manifold blocks which will only get worse over time.

If it were injectors, it would not get better when warm. And I assume that you have no other symptoms with your misfire that would point to a head gasket. But if you see white smoke or a "milkshake" in the oil galeries, then it IS likely a head gasket blowing though, which seals off when warm enough. This also deteriorates over time to become totally unserviceable.

Good news is that those other parts wont fail for a long time now. On a V-12 that can be like a giraff with a sore neck! More good news, on your car it is cheap to accomplish.
Merlin4SC is offline  
#5 (permalink) Old 11-22-2004, 11:46 AM
3rd Gear Member
 
Join Date: Jul 2004
Location: Poquoson, VA
Posts: 591
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Bear is an unknown quantity at this point
Quote:
Originally posted by gm3mtm@Aug 25 2004, 05:44 AM
I have made some improvements to the problem but here is the issue. The engine runs a bit rough for the first 20 to 30 seconds. So far i have replaced the following, some of which have helped improve the situation.....

new Pre cat O2 sensors
new mass air flow sensor
oil changed
fuel additive (barhdohls) ....seems to have helped
new fuel filter
new plugs
new cam positioning sensor


Of all of the above the oil change and the fuel additive seem to have helped the most.

Any other thoughts??


\


Or the Idle Control Valve, also a common complaint on these engines.
[snapback]172677[/snapback]
Bear is offline  
Sponsored Links
Advertisement
 
Reply

  BMW Forum - BimmerWerkz.com > BMW Model Specific Forums > 1,6,7,8 - Series and Mini Cooper


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
User Tag List

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
Warmed up idle puzzle. nightsurfride 3-Series (E21, E30) 2 02-03-2004 09:04 PM

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 Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome