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E36 /7 Z3 (1996-2002)
E36/7 Z3 roadster and coupe talk with our gurus here.

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  #1  
Old 01-24-2012, 03:42 AM
Mitch89 Mitch89 is offline
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Mein Auto: BMW Z4 3.0L Manual
3L M54 Z4 Hesitation when accererating past 3k

Hey guys,

New Z4 owner here, and I seem to have a slight issue. It's an 05 3L manual with 89000km on the clock.

I've noticed on startup what can only be described as a sort of whoosh noise just before the engine starts. It only happens when cold and the car has been left overnight. I also get a slight rattle when the engine turns off. Any other time (free revving, revving in gear, idling) it purrs like a kitten, no rattle.

The second issue is during acceleration. Sometimes when revving above 3000rpm the engine seems to hesitate, and sort of stutter between 4000rpm. Up to 3000rpm it is perfect, and sometimes between 3000 and 4000 it is fine too. There is no noise associated with it, the car just feels a bit jerky for a few moments, then it's fine again. It seems to mostly happen on light to mid throttle (at least that's when I've noticed it). Doesn't seem to matter if it is in "Sport" or not.

Accelerating from standstill and shifting before 3000rpm is smooth, and there are no issues when cruising at a constant speed (cruise control or not).

I've got a statutory 3 mth warranty from the dealer I purchased it from, so if it's something serious I want to get it rectified by them immediately. I've done some searching online but it's been hard to find an answer.

Thanks!

Last edited by Mitch89; 02-10-2012 at 08:04 PM.
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  #2  
Old 01-24-2012, 04:00 AM
Mikey48 Mikey48 is offline
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She might need a fresh set of spark plugs. My 04 Z4 3.0i did this also. A fresh set of plugs solved the problem. The whoosh you are hearing could be your secondary air pump. The pump only works for a few moments at start up when the car is cold. The rattle could be something loose under your hood. Check around under the hood and see if anything is loose. Look around the the exhaust shield it sometimes will rattle a bit. Good luck. Welcome to the club !
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  #3  
Old 01-24-2012, 04:09 PM
brianrparker brianrparker is offline
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Mein Auto: 1997 BMW z3
Mine has a problem like that to the hesitation. Im thinking spark plugs will help it. But also what i noticed is these cars do NOT like the cold.
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  #4  
Old 01-27-2012, 11:05 PM
brianrparker brianrparker is offline
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Do you have a update mitch? im curious because mine did it today also. it only happens when the car is cold or is below 20 outside. Im thinking either spark plugs or there is just to much cold air getting into in the throttle.
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  #5  
Old 01-30-2012, 01:41 AM
Z4-Driver Z4-Driver is offline
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Hi all. This is my first post on here! I've been trying to sort the very same issue on my 2.5 Z4. Thing is, it does it from idle up to about 2k RPM. the mechanic says there's no faults firing in the ECU so we can only start changing sensors to see what happens. But that is just throwing money at it to see what sticks! Does anyone have a more realistic approach / idea?
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  #6  
Old 01-30-2012, 01:59 AM
Mitch89 Mitch89 is offline
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I don't yet, I've hardly driven the car much over the last week and haven't had the time to get it in for the service and to track it down. The car didn't make the noise on startup this morning, it was much warmer so that might be why. The surging between 3k and 4k is still there though.
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  #7  
Old 01-30-2012, 02:34 AM
Z4-Driver Z4-Driver is offline
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I don't know about the noise you're having. Mines just really struggling on acceleration on low revs up to about 2k RPM. Almost like its misfiring. I've swapped out the mass airflow sensor to no avail. Could be a coil or spark plugs I guess, but all of the likely causes should log a fault in the ECU and it's not!
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  #8  
Old 01-30-2012, 02:57 AM
brianrparker brianrparker is offline
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Does it happen all the time? mine only happens when its really cold. try changing the spark plugs that is a cheap fix maybe.
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  #9  
Old 01-30-2012, 03:19 AM
Z4-Driver Z4-Driver is offline
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Yeah, pretty much all the time. And it's drinking fuel too, it's not very well! Got an appointment with the mechanics in about 30 mins. On Friday it kept doing it all the way up the rev band and the engine management light came on, so at least something should be logged in the fault codes this time. I'll let you know what it is.
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  #10  
Old 01-30-2012, 04:56 AM
Mitch89 Mitch89 is offline
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Thing with mine is my fuel eco is great, and driving below 3000rpm is silky smooth, its just occasionally over 3000rpm that I get the surging.
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  #11  
Old 01-30-2012, 05:25 AM
Z4-Driver Z4-Driver is offline
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Well, mechanic said the fault was the coil on cylinder 6. But only occurred once when the EML came on.
I stand corrected, he last changed the pre cat O2 sensor and he's still convinced its the mass airflow sensor. But this is a guess as there's no faults and at 400 I hope it fixes it, as the other 200 sensor didn't!!!!
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  #12  
Old 01-30-2012, 07:10 AM
irefayer irefayer is offline
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I had this issue myself on a 318ci. Was the Air mass sensor, replaced and not a bother.
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  #13  
Old 01-30-2012, 08:57 AM
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jmanscotch jmanscotch is offline
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Coils came to mind. Spark plugs could help too. If nothing else, try reading up on the VANOS seals and subsequent BESIAN system replacements.
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2004 325Ci - 5MT - SOLD & MISSED
2003 3.0 Z4 - 6MT - SOLD
1967 1602 - 4MT - STOLEN
2008 328XI - 6MT - EX STOLE
1995 325i - RUSTED AWAY
2009 135i - COPS IMPOUNDING
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  #14  
Old 01-30-2012, 03:02 PM
brianrparker brianrparker is offline
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i think is a scary problem. but its not a big problem. maybe just a tune up is needed.
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  #15  
Old 01-30-2012, 03:06 PM
brianrparker brianrparker is offline
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coil packs are only like 50$
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  #16  
Old 01-30-2012, 07:46 PM
tohbi tohbi is offline
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it could just be your brand of gas. that, or the grade. try switching to another brand or, if you aren't using premium, try that. fuels today are mixed with various components including differing levels of alcohol.
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  #17  
Old 02-10-2012, 02:21 AM
Z4-Driver Z4-Driver is offline
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Well folks. I have now changed the MAF sensor, the crank sensor and the plugs. All to no avail. Still stuttering under acceleration and still no fault codes. And I only use the premium petrol. Both me and the mechanics are stuck, don't know what else it could be!?
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  #18  
Old 02-10-2012, 04:18 AM
wifesauto wifesauto is offline
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a top of the line scan tool and a lab scope can monitor the ECM during a road test. scope the TPS,CPS etc
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  #19  
Old 02-10-2012, 05:11 AM
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jmanscotch jmanscotch is offline
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Mein Auto: '09 135 - 6MT - TwinTs
The VANOS seals failure is a very documented (and prominent) problem on the M54 engine. From their literature:

Vanos Seals Failure Symptoms

Overall loss of torque and power, particularly in the lower RPM range, < 3k. Bogging then surging at 3k RPM. Uneven power distribution and RPM transition. Engine hesitations in the lower RPM range, < 3k. Louder idle and intermittent idle RPM hiccups. Difficult takeoffs. Loss of power and bogging when AC on. Increased fuel consumption. Vanos fault codes.
Double vanos cars with the M52TU engine (98/99-00) experience cold weather cold start idle jolts and possible stall.


Their website for more info and their product (that is well respected and used as a cure): http://www.beisansystems.com/

Now I know not all of those symptoms describe your situation exactly, but I had what you describe, *to the "T"* on my E46 and it was the seals. Most of the sysmptoms described come on later down the road as the seals wear out even more.
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-Jake

2004 325Ci - 5MT - SOLD & MISSED
2003 3.0 Z4 - 6MT - SOLD
1967 1602 - 4MT - STOLEN
2008 328XI - 6MT - EX STOLE
1995 325i - RUSTED AWAY
2009 135i - COPS IMPOUNDING

Last edited by jmanscotch; 02-10-2012 at 05:12 AM.
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  #20  
Old 02-10-2012, 04:47 PM
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shipkiller shipkiller is offline
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Just for clarity sake, you have a M54 engine.

The 3000rpm thing also could point to the DISA valve. Item 7 listed here: http://www.realoem.com/bmw/showparts...79&hg=11&fg=40

The valve flap opens in the intake around 3K. This has been a known issue on M54 motors.
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How does something immoral, when done privately, become moral when it is done collectively?
Furthermore, does legality establish morality?
Slavery was legal; apartheid was legal; Stalinist, Nazi, and Maoist purges were legal. Clearly, the fact of legality does not justify these crimes. Legality, alone, cannot be the talisman of morel people. - Walter E. Williams
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  #21  
Old 02-10-2012, 07:41 PM
Mitch89 Mitch89 is offline
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You're 100% right, not sure why I put M52. I've read about that issue, along with instructions of removing the DISA, might have a go at checking it out.
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  #22  
Old 02-22-2012, 04:19 PM
Mitch89 Mitch89 is offline
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Location: Sydney, Australia
 
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Well got the codes read at BMW this morning, the computer lists "DME Misfire, cylinder 2", "DME Misfire at several cylinders" and "DME Misfire, cylinder 4". The kilometres showing for these codes are literally a couple of km before I purchased the car (from a different BMW dealer).

The tech at BMW suggested a reflash might help the situation, but is concerned that could cause other problems.

Thoughts?

Rather bummed...
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  #23  
Old 02-22-2012, 05:39 PM
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shipkiller shipkiller is offline
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At 69K I had to replace all six coils on my Roadster. It started with a major misfire that blinks the CEL light. (Minor misfires just set an internal code in the DME) I troubleshot this to one bad coil (Cylinder 4) which I replaced. Then the car exhibited hesitation upon acceleration during the test drive. More troubleshooting diagnosed intermittent low frequency misfires on various coils, never staying on an individual coil. Ordered five more coils and replaced. Problem fixed.

Just another data point.

I personally, would replace your coils if they are the original ones before you start with a DME reflash. But thats just me.
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How does something immoral, when done privately, become moral when it is done collectively?
Furthermore, does legality establish morality?
Slavery was legal; apartheid was legal; Stalinist, Nazi, and Maoist purges were legal. Clearly, the fact of legality does not justify these crimes. Legality, alone, cannot be the talisman of morel people. - Walter E. Williams
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  #24  
Old 02-22-2012, 06:04 PM
Mitch89 Mitch89 is offline
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Location: Sydney, Australia
 
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Mein Auto: BMW Z4 3.0L Manual
Yep the BMW guy also raised the issue of coils. The car is just under 90000kms on it, so not too far off yours when you did your coils.

Mine has never shown me an indicator on the dash, so as you say is a minor code.
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  #25  
Old 02-22-2012, 06:15 PM
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shipkiller shipkiller is offline
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You can do the coils yourself in about 40 mins.
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How does something immoral, when done privately, become moral when it is done collectively?
Furthermore, does legality establish morality?
Slavery was legal; apartheid was legal; Stalinist, Nazi, and Maoist purges were legal. Clearly, the fact of legality does not justify these crimes. Legality, alone, cannot be the talisman of morel people. - Walter E. Williams
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