rough idle, reduced power, oil cap suctioned on - BMW Forum - BimmerWerkz.com
5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)

 
LinkBack Thread Tools Display Modes
#1 (permalink) Old 08-02-2009, 10:29 PM
n00b
 
Join Date: Jan 2009
Posts: 3
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
goose512 is on a distinguished road
(Thread Starter)
rough idle, reduced power, oil cap suctioned on

2002 525i. Check engine light is on and the car runs rough at idle with reduced power during accleration. There is a "hissing" noise coming from the engine compartment that does not change pitch with RPM's I noticed when I take the oil filler cap off while the engine is running the hissing is diminished and the engine smooths out slightly. When I do take the oil filler cap off it is "suctioned" on and there is a rush of air into the engine when I pry it off. Earlier posts suggested MAF sensor but had a mechanic tell me that if the oil filler cap is difficult to remove that it's probably something else, I just can't remember what he said it might be though.

Thank you in advance.
goose512 is offline  
Sponsored Links
Advertisement
 
#2 (permalink) Old 08-05-2009, 04:16 PM
n00b
 
Join Date: May 2009
Location: Parsippany, NJ
Posts: 41
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
jimoreno is on a distinguished road
You probably have a vacuum leak somewhere. Check the intake boot and hoses around the intake manifold area. If you cannot find anything use carb cleaner sprayed on different suspect areas until you hear the engine improves. since now you've found the area of the leak, dive deeper and fix it. Also, check which code the is stored in the system for the engine light to be on.
jimoreno is offline  
#3 (permalink) Old 08-05-2009, 07:44 PM
Mr. Clean
 
BimmerE39's Avatar
 
Join Date: Jan 2009
Location: Danbury, Connecticut
Posts: 1,817
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
BimmerE39 will become famous soon enough
Garage
Yeah, it definitely sounds like you have a vacuum leak.
BimmerE39 is offline  
#4 (permalink) Old 08-06-2009, 08:15 AM
n00b
 
Join Date: Aug 2009
Posts: 6
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
izzy786 is on a distinguished road
have you checked the EGR valve there is a small pipe that comes off that .. that may be loose?

im sure that may be the cause.. as that would generare the hissing sound

Good luck - keep us posted on your progress

Izzy
izzy786 is offline  
#5 (permalink) Old 08-10-2009, 06:27 PM
n00b
 
Join Date: Jan 2009
Posts: 3
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
goose512 is on a distinguished road
(Thread Starter)
Update:

I thought I would update everyone and thanks for the help. I took it to the shop to have it repaired since I was going out of town for a few days. Here's the story.

The primary problem was the crankcase vent valve. It was replaced along with the connection line which was starting to crack.

As a result of the problem though, all of my spark plugs were fouled and had to be replaced, as well as one coil from the #5 cylinder.

I hope this helps anyone else with similar problems, and thanks to everyone who replied.

DG
goose512 is offline  
#6 (permalink) Old 08-10-2009, 06:43 PM
OMFG another one!?
 
witeshark's Avatar
 
Join Date: Aug 2004
Location: Miami FL
Posts: 14,702
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
witeshark is just really nice witeshark is just really nice witeshark is just really nice witeshark is just really nice witeshark is just really nice
Thanks for sharing the solution.

BMW

Sig by zeaq
witeshark is offline  
Sponsored Links
Advertisement
 
Reply

  BMW Forum - BimmerWerkz.com > BMW Model Specific Forums > 5-Series (E12,E28, E34, E39, E60)


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
Rough idle & jumping idle ///M Power 3-Series (E36) 4 12-22-2008 06:20 PM
95 740iL rough idle no power help! onadaga 1,6,7,8 - Series and Mini Cooper 4 10-31-2008 01:00 PM
Rough Idle komodo 3-Series (E36) 5 03-14-2005 11:00 PM
Rough Idle fins1972 3-Series (E46, E90) 4 01-17-2005 06:21 PM
Rough Idle when Oil Filler cap removed DMan328 3-Series (E36) 11 03-29-2004 04:48 AM

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