Engine response

S

spareone3

Member
 Lincs
On many occassions the engine seems to almost stall when I blip the accelerator, (from idle). I ensured I filled up with Optimax as I wondered if inferior fuel may be a cause, but it still does it even with the "best stuff". Is there a known fault for this type of symptom? The engine seems fine when idling and under normal conditions. No mis-fires I can detect, no warning lights etc. Any ideas would be welcome....
 
yeah, I have it sometimes too...for example you give it some throttle to take off, but the person in front of you stops again and then moves, so I go off the throttle and then back on...it's then when the engine almost stalls...
 
I sometimes get it, not to the point where the car will almost stall but there is a drop in engine revs. It's a bit weird, dont know why it happens. :idunno: For me, smoother/slower inputs is better for Z4M city driving, i dont mind if i'm a few milliseconds slower than everyone else. :)

Perhaps try resetting the throttle pedal adaptation? Our car's throttle pedals adapt depending on how the car is used, prolonged city driving makes the response softer and duller. I've found that resetting it helps.
 
I sometimes get this when mashing from 1 to 2 near the redline. Just a teeny hesitation for a nanosecond after shifting up, whether this is the same thing who knows :oops:
 
Do you guys remember Evos 2nd hand buy review. There is something abouot resetting the throttle by switching ignition on and off for 10 secs:

"Engine
Check the service book for the initial, 1200-mile service. This is where the fluids are changed from the run-in spec to the normal spec, and if it wasn’t done then serious wear could result.

Curiously, the throttle system can go out of tune. Resetting it can improve throttle response and its really simple to do: turn the ignition on and wait for 10 seconds, then turn it off for 10 seconds, then turn it on again for 10, then start the engine.

The crankcase ventilation oil separator assembly can clog with sludge; in extreme cases this can lead to combustible vapour building up in the intake and going bang in a big way when you next start the car. The valve is fitted to many BMWs and is one of the most ‘popular’ replacement parts"

Ob viously the rest of the article about the steering is pants but they did make a retraction :)
 
I had exactly this happen in the car park leaving Bala on the wales run this weekend, today the dealer did a throttle adaption reset whilst it was having the rear coilsping replaced. Seems much better behaved now :)
 
Adam D said:
I had exactly this happen in the car park leaving Bala on the wales run this weekend, today the dealer did a throttle adaption reset whilst it was having the rear coilsping replaced. Seems much better behaved now :)
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I had the battery disconnected for a few hours the other weekend, so the throttle should have reset. Still get it where the engine seems to want to die as I blip the throttle on moving off.
 
I'm not sure if its exactly the same and I wasn't in a position to speak with the tech guy directly but I would like to think the car would self callibrate after a battery disconnection; I was told they plugged it into their computer and it reset the throttle potentiometers or something... either way im happy so long as its sorted and doesn't come back :)
 
tomwac said:
yeah, I have it sometimes too...for example you give it some throttle to take off, but the person in front of you stops again and then moves, so I go off the throttle and then back on...it's then when the engine almost stalls...
Click to expand...

How about giving a good blast and a bit of stick for a couple of hours, getting the temperatures and pressures up- Just to clear its throwt :D

Whenever I've had ghost problems like that after much town driving and general poodling around in traffic for a few months, I found it a good cure.

Let us know.
 
Hark said:
playalistic said:
I sometimes get this when mashing from 1 to 2 near the redline.
Click to expand...

Remind me never to buy your car. lol :driving: :rofl:
Click to expand...

:x 1st gear is for moving off n ot hooning around and showing off :x

2nd and 3rd are just fine for that :D

How are we doing with this engine response problem?
 
Since my previous comment I can confirm that since the dealer reset the throttle thingy it's been well behaved.
 
ChawenHalo said:
Do you guys remember Evos 2nd hand buy review. There is something abouot resetting the throttle by switching ignition on and off for 10 secs:

"Engine
Check the service book for the initial, 1200-mile service. This is where the fluids are changed from the run-in spec to the normal spec, and if it wasn’t done then serious wear could result.

Curiously, the throttle system can go out of tune. Resetting it can improve throttle response and its really simple to do: turn the ignition on and wait for 10 seconds, then turn it off for 10 seconds, then turn it on again for 10, then start the engine.

The crankcase ventilation oil separator assembly can clog with sludge; in extreme cases this can lead to combustible vapour building up in the intake and going bang in a big way when you next start the car. The valve is fitted to many BMWs and is one of the most ‘popular’ replacement parts"

Ob viously the rest of the article about the steering is pants but they did make a retraction :)
Click to expand...

The throttle doesn't 'go out of tune', it just adapts to a particular style of driving over a period of time. So if you are doing a lot of stop-start low speed town driving, then go for a blast in the country, it won't pick up as well as it could because its adapted itself to town driving...hence the simple reset procedure.....which I believe is just insert key, turn to ON position (without starting), wait 15 seconds, turn off, then start as usual.
 
Well, I hope it's more than a placebo effect, but I reset the throttle yesterday, it does seem a lot better I've got to say.. :) . Will see how the next few days pan-out.
 
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