https://www.boards.ie/ Tue, 07 Apr 2026 03:17:45 +0000 en sluggish acceleration — boards.ie - Now Ye're Talkin' https://www.boards.ie/discussion/2057700776/06-bmw-520d-manual-sluggish-acceleration-hesitation-no-power-in-low-revs-hiccups Wed, 01 Feb 2017 23:50:37 +0000 Motors pliauskiux 2057700776@/discussions
I've got 2006 e60 520d manual (140k miles) m47 engine and I've been having issues with the car being underpowered in low revs for a few months now.
I bought the car 3 months ago and a few weeks later I've noticed that the car is seriously underpowered in low revs. Wasn't paying much attention to it initially as I thought it's normal. Moved onto this 163bhp version from a 105bhp passat so it really didn't feel like anything was wrong with it.

• The car accelerates very slowly below 2k RPM but drives fine afterwards.
• Rev needle also acts weird. Let's say I'm driving at 2.6k revs, If I get my foot of the accelerator for a second and then put my foot down again, the rev needle jumps up about 50rpm, jumps back down to 2.6k again and then slowly raises up as it should. This happens very quickly and cause 1 second lag. Add this to sluggish acceleration in low revs and the thing is a death wish as it has stalled on intersections and other dangerous places before.
• It also feels like it's hiccuping. I can feel sudden decrease in power for a split second around 1.4-1.8k revs and around 2.5k revs (sometimes). Usually until it's driven for 15-30mins or so.

Car has had a full service done 2 months ago.

In the past month a few things have been done to the car trying to sort out the problem:

1. Crankcase breather changed to vortex type
2. MAP sensor replaced
3. MAF sensor cleaned using EGR cleaner
4. New glow plugs
5. EGR/Throttle body/intake manifold cleaned, swirl flaps blanked off
6. DPF has been removed physically + in the software, EGR blocked through software

Only 1 error stored as of now, 1 glowplug gone (again).

Initially thought it could be MAP/MAF sensors, swirl flaps, EGR valve or the Crankcase breather, nothing helped.

The only thing that actually helped increasing the performance was getting DPF removed, it kept getting blocked and I was losing boost as the turbo wouldn't kick in until 2.8k revs or so. I got the boost back after 1.8k revs but still dangerously underpowered under 2k.

Some people have mentioned that the problems I'm having could be caused by:

• Faulty MAF sensor
• Turbo actuator
• Turbo itself

All the help is greatly appreciated. Thanks!]]>