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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 5 Series > E39 (1997 - 2003)

E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 01-30-2007, 04:27 PM
millsey millsey is offline
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Location: Ballina, Australia
 
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Mein Auto: 1998 535i
Misfiring under load

When driving at aprox 80kmh (50 mph) with a light throttle the car seems fine however when I come to a slight hill and increase the throttle slightly (not enough for the auto box to change down to 4th gear) the engine develops a marked misfiring sensation.
I have taken it to an independent service centre and had the codes read-the only fault he could find was an oxygen sensor related one which he cleared and after he test drove it,the code did not reappear.
I would appreciate any help that members can provide.
Vehicle is a 11/97 build 535i
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  #2  
Old 01-30-2007, 05:12 PM
Hotswimmer Hotswimmer is offline
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Misfire under load often means clogged catalytic converter(s).
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  #3  
Old 01-30-2007, 05:57 PM
franka franka is offline
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Does it do it consistently? Is it just when you dip into the throttle lightly? What happens if from a 50 cruise you dip into the throttle more than just lightly? Does it still do the same?
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  #4  
Old 01-30-2007, 06:45 PM
Tom S. Tom S. is offline
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I had similar thing happen on my 528i at 88K on the clock. It was caused by a cracked insulator on #6 plug that was arching through the boot to the cylinder head. Check your spark plugs if you have few miles on them. If you replace the plugs replace the boots also they were under $10 each few years ago.
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  #5  
Old 01-30-2007, 07:45 PM
millsey millsey is offline
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Mein Auto: 1998 535i
The cats were replaced aprox 15000 km's ago(vechile has 88000km's) and to answer franka it seems to become worse as the engine heats up and as more load is placed on the car for example going up a quite steep hill in 3rd at aprox 4000 rpm
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  #6  
Old 01-30-2007, 07:50 PM
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Brian McKinney Brian McKinney is offline
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mass air flow sensor
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  #7  
Old 01-31-2007, 07:04 AM
franka franka is offline
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If it doesn't clear up by itself in the next couple of days I would take it to a dealer for diagnosis. They have the best diagnostic equipment and it looks like you will need it.

You always have the right to take the car somewhere else for repairs but the dealer will charge about $90 for the diagnosis only.

That's a small sum to find the problem. If the problem is a cracked spark plug insulator or some other minor item you could have them repair it.
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  #8  
Old 09-05-2012, 11:01 AM
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ztom ztom is offline
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Location: Thousand Oaks CA
 
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Quote:
Originally Posted by Brian McKinney View Post
mass air flow sensor
I'm having this issue. I think I'll spray the MAF. Maybe if the MAF is gunked, at high rev the engine thinks there's less that actual air coming in, so it cuts back on gas, causing a lean condition.
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  #9  
Old 09-05-2012, 02:45 PM
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Topaz540i Topaz540i is offline
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do you buy cheap gas? maybe its the knock sensors retarding the timing
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  #10  
Old 09-06-2012, 11:21 AM
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ztom ztom is offline
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It's been happening for months with different brand gas. But you may be right about the knock sensors because yesterday I was watching the fuel trims and ignition advance in real time on the code reader. All good at fwy speeds 3K rev until a slight uphill, then I can see the ign advance drop down from +30 deg. But short term trims looked ok, so I don't think it's a vac leak, maf, plug, injector or coil pack issue. Also replaced the CPS. Only happens under load. I can accelerate from stop and wind out to >4K and no stumble/misfire, only if on a hill. If not for uphill, car drives great, good power through range. Still can't figure out the cause. One reply to me was maybe the knock sensor has gone bad. Engine has 250K miles.

Last edited by ztom; 09-06-2012 at 11:23 AM.
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  #11  
Old 09-06-2012, 11:24 AM
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ztom ztom is offline
I gotta have more cowbell
Location: Thousand Oaks CA
 
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Quote:
Originally Posted by Hotswimmer View Post
Misfire under load often means clogged catalytic converter(s).
I have same issue, maybe my cats are clogged..
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  #12  
Old 09-06-2012, 11:41 AM
JimLev JimLev is offline
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If your CATs were clogged it should be more of a problem at WOT.
I had a similar problem a few months ago, give it a little gas and it sort of felt like it was missing. No codes or pending codes. I cleaned the MAF with CRC and the problem is gone.
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  #13  
Old 09-06-2012, 12:39 PM
edjack edjack is offline
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When my cats finally packed up, I got the bank 1 code for random multiple misfires. THe DME can detect back pressure (don't ask) and will shut down the cylinders to prevent further cat damage.
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  #14  
Old 09-06-2012, 01:54 PM
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ztom ztom is offline
I gotta have more cowbell
Location: Thousand Oaks CA
 
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Mein Auto: 1997 528i
Quote:
Originally Posted by JimLev View Post
If your CATs were clogged it should be more of a problem at WOT.
I had a similar problem a few months ago, give it a little gas and it sort of felt like it was missing. No codes or pending codes. I cleaned the MAF with CRC and the problem is gone.
I've tried to relate it to WOT under various speeds/gears, but does not seem to relate to WOT. It is completely related to being under load at frwy speeds, during which STFT's are ok. If a maf issue I would expect the STFTs to go out of limit on positive %.

A couple days ago I had a spare maf, cleaned it and installed, no change to issue.

I did notice that when it happens, if I then reset it and get back on the frwy, the stumble is less severe and at a little higher rev when it happens, don't know why though.
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