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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 04-21-2015, 12:51 PM
mooal5 mooal5 is offline
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Location: Kansas City
 
Join Date: Mar 2011
Posts: 6
Mein Auto: 03 E39 540/09 E64 650
Cut out/pulse under light load low RPM low speed

Hello guys and Gals.

I am looking for some direction here. I have read thru tons of related posts and cannot find my culprit exactly.

I have a 2003 E39 540I M sport with 175k. I have owned the car for 7 years and have preformed all normal maintenance, and some!!

For the past 2 months I have had a pulse seems fuel related issue. Normal driving low RPM (below 2k) it feels like the fuel gets restricted. Or like someone pull slightly on the e-brake. This does not happen when RPM's are higher say on highway over 80mph when RPM's are above 2K. Nor does it occur under heavy load. Basically just when cruising at say 45 mph RPM below 2K. No other signs of a problem starts fine, runs up to speed fine, idle's like a dream.

I have no codes stored, no warning lights of any kind. I replaced the fuel filter/pressure regulator last week and still have the issue. I am leaning to fuel pump (As far as I know it is original). Just wanted to see if anyone had a similar issue and found the cause. I did read one thread where someone has loose wires on the pump sending unit and re-secured... problem solved. I doubt I will get that lucky.

Thanks for any reply's with thoughts....
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  #2  
Old 04-21-2015, 01:04 PM
edjack edjack is online now
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Location: San Jose, CA
 
Join Date: May 2007
Posts: 11,127
Mein Auto: '97 540i 6 speed
I assume you checked for pending codes, as well.

If you suspect a fuel problem, connect a fuel pressure gauge to the Schrader valve on the fuel rail. Tape it to the windshield wiper arm. Monitor the pressure.

I'd vote for a vacuum leak.
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  #3  
Old 04-21-2015, 01:13 PM
mooal5 mooal5 is offline
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Location: Kansas City
 
Join Date: Mar 2011
Posts: 6
Mein Auto: 03 E39 540/09 E64 650
Yes I checked no pending codes. I had read about fuel pressure test. I think that will be my next step. I appreciate your reply.
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Old 04-21-2015, 04:23 PM
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bluebee bluebee is offline
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Location: San Jose, California
 
Join Date: Mar 2008
Posts: 25,236
Mein Auto: 02 BMW 525i M54 auto 130K
- How to identify all BMW computer-specific OBDII DTC diagnostic fault codes (1) & how to better understand the key EPA federal test procedure (FTP) concept of the BMW SES "drive cycle" (1) & how to diagnose a typical BMW E39 engine misfire (1) or a sporadic-temperature-change cold-engine intermittent misfire (1) (2) & what you can expect for E39 smog emissions test results (1) & obtaining the pending or diagnostic trouble code (DTC) using free or freeware scans (1) [except in California or Hawaii (1) (2)] or where to get the cheapest reasonable OBDII scanner in the world (1) (2) or a better overall scanner (1) or the best BMW diagnostic tools (1) (2) (3) & a template of what to tell people from the Republik of Kalifornia who need to do an OBC diagnostic scan (1).
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See also: E39 Bestlinks & How to easily find what you need
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