fluffy acceleration
- Thread starter MR BLACK
- Start date
Run on 98 or 99 and see if it makes any difference, used to on mine 
Shipkiller
Veteran
At what RPM range does the acceleration problems occur at?
Shipkiller
Veteran
Go to this site and read the symptoms. If they are similar to yours then the Vano's O-rings are the culprit. Just, be advised that the cold idling symptoms that are reported on this site does NOT manifest itself on the Zed's M-54 engine.
http://www.beisansystems.com/procedures/vanos_procedure.htm
Not saying that this is the problem, but you can decide that.
http://www.beisansystems.com/procedures/vanos_procedure.htm
Not saying that this is the problem, but you can decide that.
When were spark plugs, oil, air filter etc all changed?
Is this in sport mode or normal, or both?
Up to operating temp, or during warm up cycle?
How many miles does your engine have on it?
Shirley if VANOS isn't reacting as the sensor/ecu demands, then a fault code is logged?
Dave
Is this in sport mode or normal, or both?
Up to operating temp, or during warm up cycle?
How many miles does your engine have on it?
Shirley if VANOS isn't reacting as the sensor/ecu demands, then a fault code is logged?
Dave
Shipkiller
Veteran
1/2 the time with a Vanos O-ring issue, a fault code is not shown.
Pretty much identical to mine then... which had an insp2 at 58k at about the same time as you, so new plugs + oil + air filter.
Hmmmm... doesn't sound 100% right then.
I have noticed, for the first one or two full throttle but low rev accelerations mine sort of skips for half a second, ie, 1st/2nd then into 3rd out of a junction when it's still stone cold at say 20mph, and it does it. But it only does it once or twice and then is perfectly smooth right through.
Not sure if it's throttle sensor related (doesn't it auto-range/calibrate every time it starts!?) or just calibrations keeping it smooth/clean during that cold start period.
I'd possibly have a play with the throttle when it does it. Go WOT, and then back to part throttle and see what happens. Does it go fine, or does it fluff still etc...
I'll have a re-read of the VANOS operation specifics but it sounds more related to inputs/sensors than an actual mechanical fault as I'm sure the tech docs said any VANOS non-response to request would issue a fault code (iirc, need to re-read )
Dave
Hmmmm... doesn't sound 100% right then.
I have noticed, for the first one or two full throttle but low rev accelerations mine sort of skips for half a second, ie, 1st/2nd then into 3rd out of a junction when it's still stone cold at say 20mph, and it does it. But it only does it once or twice and then is perfectly smooth right through.
Not sure if it's throttle sensor related (doesn't it auto-range/calibrate every time it starts!?) or just calibrations keeping it smooth/clean during that cold start period.
I'd possibly have a play with the throttle when it does it. Go WOT, and then back to part throttle and see what happens. Does it go fine, or does it fluff still etc...
I'll have a re-read of the VANOS operation specifics but it sounds more related to inputs/sensors than an actual mechanical fault as I'm sure the tech docs said any VANOS non-response to request would issue a fault code (iirc, need to re-read
)Dave
My 3.0 manual 53 reg Z4 is doing a silimar thing.
I would describe it as hesitant acceleration rather than fluffy ;-)
A few months ago i had a coil pack fail and i was told the others usually follow suit once one goes.
I recently noticed this hesitation when accelerating from a low speed and low revs, usually in 3rd gear.
It's fine most of the time though.
Mine has covered 45,000 miles and its due for an oil change in another 1,000 miles or so.
Having read around people mention coil packs, plugs and fuel filters...
I might just get the plugs replaced seeing as i've got new coil packs in it now..
I would describe it as hesitant acceleration rather than fluffy ;-)
A few months ago i had a coil pack fail and i was told the others usually follow suit once one goes.
I recently noticed this hesitation when accelerating from a low speed and low revs, usually in 3rd gear.
It's fine most of the time though.
Mine has covered 45,000 miles and its due for an oil change in another 1,000 miles or so.
Having read around people mention coil packs, plugs and fuel filters...
I might just get the plugs replaced seeing as i've got new coil packs in it now..
