Junior Member, warming up (<31 posts)
Join Date: Jul 2015
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Stop/start traffic nightmare! New M5 user - Sydney
After some weeks waiting for approval to join the board, it is now my time to introduce myself and discuss the existing issues that are preventing me from fully enjoying the Green beast. Like Shrek but with Carrera's, Air Max's and bulging 'roid muscles!
I bought this car from fellow M5 board member Lumsden in Brisbane, after many weeks looking at M3's my eyes lit up at the M5 and I got excited. Really, really excited. So after some long phone calls and a lot of keen BMW questions I took the punt and flew up there with cash and drove the car the 650 miles back to Sydney all in the space of 4 days. Talk about impulsive!
Now it might have been the way I was driving the car but the further I got into the drive back and especially as I got into Sydney, I noticed some lull at around 2-2.5k rev range. This turned into a full jerk whenever I changed gear in this range or if I was coming on/off the accelerator. Just to give you some specific details on my vehicle:
172k miles on body
66k miles BMW engine rebuild (piston rings)
106k miles on current engine
fastidiously maintained on time all the time including g/box and diff
Castrol 10w60 and 98RON fuel used throughout the life
To boot (I know this would make some owners jealous) I bought a bottle of 10w60 thinking that top up after nearly 1000 miles would be necessary. It was not. Dipstick is still on maximum line from when I picked it up in Brisbane. Gear changes are smooth and I don't need to force - occasionally I need to double clutch to get it into first when stopped but this is no big deal.
Onto the PROBLEM:
I get what I thought was a hesitation but I am now thinking is more of a clutch slip after I change gears and apply the throttle. I have test drove an M5 and M3 before and have owned a E46 manual before so am certain this is not me not driving it incorrectly. I am also certain it isn't the clutch wearing out because it bites HARD when it reengages.
This doesn't happen if I have had the gear engaged for a longer period and I can put my foot down in 2nd and fly ahead into 3rd, 4th fine higher up the torque band / rev range. If I stay in gear and allow the range to go close to idle and take my foot off and then back on the gas quickly then this HARD clutch bite comes back into play.
One evening I had VBR on (to test MAFs) and noticed that when this jerk happens, the consumption climbs to about 45-55 l/100km.
I did a launch at some annoying red lights (the ones that stop traffic when there are no cars waiting) and the bite was there as I ran through the gears but it was much a quicker bite.
What I have done so far:
First thing was to post and bother everyone without doing a code read, secondly was to get codes read! I met up with a fellow M5 owner who gave me some spare MAFs and put the Peake reader onto the vehicle. I got a:
16 - VANOS exhaust 1-4 - could be a cps (changed less than 24 months ago (15k miles) with Bosch ones. VANOS o-rings and solenoid boards re-soldered and replaced recently.
AA - secondary air system - normal, can't be helped. No CEL so not bothering me. Needs a good blast with exhaust manifold off.
I spoke with a guy at a local specialist in Sydney yesterday, Bimmertech, about the possibility it could be my DMF failing. I have been through a decade of service history receipts and there isn't a record of the DMF or clutch ever being done. Suggesting that the clutch could be briefly slipping at the beginning of the engine torque range because the DMF springs are failing to properly support when the clutch and engine mate.
All thoughts are welcomed and I hope I haven't come across as a complete noob.
E39 - 2002 M5 - Oxford Green with carmel interior - current
E38 - 1997 750iL - Black with black interior
E46 - 2002 330i Convertible - Gold with gold interior