1995 E34 540i Poor Acceleration - 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 03-28-2005, 09:24 PM
n00b
 
Cambridge's Avatar
 
Join Date: Aug 2004
Posts: 26
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Cambridge is an unknown quantity at this point
Send a message via AIM to Cambridge Send a message via MSN to Cambridge
(Thread Starter)
I’m not getting the power I used to out of my 95 540i. It idles smooth as silk and cruises nicely, but when I punch the accelerator to pass or merge with traffic, it just doesn’t seem to have the power it used to. The exhaust also seems to have a different note when I punch it. I’m used to a smooth turbine-like sound, but now I hear a slight chuffing rhythm in the exhaust. Before it was effortless acceleration, now the engine seems to labor.

Interestingly, about 120 miles or so ago, I replaced the oxygen sensors and plugs. For about 30 miles the car was like a rocket. Smooth, powerful acceleration. Then, while at highway speed, I experienced a short burst of engine knock and an accompanying loss of power. The knock quickly went away in a couple seconds, but the power never came back.

The computer shows two persistent faults: “lambda control #1” and “lambda control #2”

I rechecked the sensors and the plugs, but they seem fine. The car has an Alusil block with 108000 miles. I checked fuel pressure per Bentley and that all checked out.

I’ve heard that the computer needs 150 miles to adjust itself after a sensor change. Could that be the cause of poor performance? Is it possible that this is all because of a bad injector? I’ve also heard that it could be the exhaust gas recirculation control on the back of the intake manifold. (Although there is not much suction when I open the oil filler or pull the dipstick).

Any ideas?

<img src='http://bmw-540i.com/images/540i/540i.jpg' border='0' alt='user posted image' />
<a href='http://www.bmw-540i.com' target='_blank'>My BMW 540i website</a>
Cambridge is offline  
Sponsored Links
Advertisement
 
#2 (permalink) Old 03-29-2005, 01:16 PM
5th Gear Member
 
billB's Avatar
 
Join Date: Aug 2004
Location: New Jersey
Posts: 1,635
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
billB has a reputation beyond repute billB has a reputation beyond repute billB has a reputation beyond repute billB has a reputation beyond repute billB has a reputation beyond repute billB has a reputation beyond repute billB has a reputation beyond repute billB has a reputation beyond repute billB has a reputation beyond repute billB has a reputation beyond repute billB has a reputation beyond repute
Send a message via Yahoo to billB
Lambda control 1/2: means the DME senses large deviations in the value of air-fuel mixture could be too rich or too lean. Many possibilities as you can imagine such as fuel pressure problems, defective injector, air leak, and problems with the fuel evaporation. I say have a pro check it to minimize this guess work.

Note: when O2 sensor is the problem a different code like 1212 is stored in your DME this so because the DME does NOT read any value (output) from a non operational O2 sensor—bad wires or O2 sensor proper going south…….

regards
billb
billB 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
Does the 540i (E34) have a timing belt? Amazetbm 5-Series (E12,E28, E34, E39, E60) 4 10-06-2005 12:46 AM
Fs: 1995 E34 540i - $8450 Obo newdad52001 Classifieds Sell & Buy 2 01-20-2005 09:17 AM
E34 1995 540i Mods? cmbruner 5-Series (E12,E28, E34, E39, E60) 7 09-26-2004 03:35 PM
1995 540i for sale $12,700 540ibeast Classifieds Sell & Buy 1 10-20-2003 03:50 PM
For Sale 1995 540i six speed with M Sport Pkg Steve Diamond Classifieds Sell & Buy 6 05-06-2003 11:21 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