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130i sluggish throttle response

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5K views 21 replies 7 participants last post by  Littlejohno43  
#1 ·
Hello folks,

I've read a bunch of stuff on here and various other forums about this but feel compelled to make my own post as none of the other threads have described exactly what I think is happening to my car. I'm hoping it's something small that's a bit amiss with my new 130i but at present I'm thinking it's more systemic...

The basic problem is that in certain situations the throttle response is delayed from when I put my foot down. I mean completely delayed, it's like I haven't touched the accelerator at all until roughly a second later (probably a touch less, but it feels like ages).

It only occurs when I'm coasting and wish to accelerate again in the same gear, for example: Sitting in third gear, lift foot off throttle completely with car still in gear, put foot back on pedal and press it down, there's a pause before the engine actually revs again. It seems to occur in all gears so long as the situation is the same (lift off throttle, try to reengage it in the same gear).

There are no problems if I've engaged the clutch, so if I've changed gears either up or down (or even to the same gear) the throttle response is instant, it's only coasting>acceleration that seems to be the problem.

It's driving me nuts, I feel that the throttle should behave identically in all situations so you can "trust" it. From my reading on here and elsewhere my thinking is that it's the drive by wire postponing my input for I don't know what reason.

Does anyone have any other ideas? Suggested fixes? The car itself has just had a basic oil change/pollen filter service, I'm not sure if they checked the sparkplugs which is something that's on my list but I haven't had a chance to do yet.

In general web searches about the issue I've come across various ECU programming bits and pieces that claim to remove this lag amongst offering additional power or whatever, does anyone have experience with these (specifically with a 130 ideally, turbo models muddy the water as far as throttle lag goes as I could see people confusing turbo lag with this specific problem)?

Thanks!
 
#6 ·
Well after reading through the other thread I thought that perhaps it was the ignition coils. They were insultingly expensive locally (before the enthusiastic mechanic's fees) so I ordered a set online and changed them myself today. The actual work was easy to do if you follow the instructions in the other thread but, sadly, it hasn't fixed my problem!

Still if I lift off the accelerator but remain in gear, when I try to accelerate again there's a fractional pause before the engine responds. It's particularly noticeable when slowly tootling through the neighborhood in second/third and easing through corners in gear. I brace myself for the acceleration but it just doesn't happen immediately. If the accelerator is actively engaged, any changes in acceleration are instant, it's only when going from coasting to acceleration.

Does anyone have any other thoughts? Anyone else with a 130i experienced something similar?

Thanks!
 
#7 ·
I'm sorry to hear the colils haven't improved anything. :(

Sounds like it's time for a fuel map that's more power focused.

'EvoGlynn' had his mapped by Evolve with excellent results if I recall correctly. Not loads of power, but better throttle response and more midrange punch. Ended up being a pretty even match for M3's.

Whereabouts are you roughly?

Have a wee haggle on price though.
 
#12 ·
Hah, it would be quite a journey for me to make it to Evolve as I am indeed over the water. I think it would be fair to say I'm almost over all the water down here near the bottom of Australia...

And yes, Littlejohno43, it's sort of a jolt. I'm still not used to it so when there's no response initially I guess I put my foot down a bit harder so when the power does arrive, it's more enthusiastic that it would have been originally. Does this sound normal to you?

I've read about a few reputable local third party BM service centres, I'll look into what local remap options are available.

Thanks again folks!
 
#13 ·
I've had the same issue the only thing I find that stopped it was an oil change an solenoid clean.
This is bearing in mind I change my oil every 4000 miles roughly so it's not filthy but it seems to sort it.
I have also changed the plugs they had only done 10, 000 miles so it's not a plug issue.
Coils are a possibility but the above seems to work for me

Sent from my GT-I9300 using Tapatalk 2
 
#14 ·
That's odd. Mine was doing this and I bought a set of coils to put in at some time in the future. Popped the car into the local dealer for an oil service last week and it hasn't done it since. I can't for the life of me see why an oil/filter change should make any difference at all.
 
#18 ·
The solenoid is for the vanos which can gum up there is a software update to motor it further to stop carbon build up I believe.
Obviously an oil change will do this as well the vanos is vital as it controls the air intake.
I can post a pic of where it's situated and it's a five minute job to remove and clean them

Sent from my GT-I9300 using Tapatalk 2
 
#19 ·
Littlejohno43 said:
The solenoid is for the vanos which can gum up there is a software update to motor it further to stop carbon build up I believe.
Obviously an oil change will do this as well the vanos is vital as it controls the air intake.
I can post a pic of where it's situated and it's a five minute job to remove and clean them

Sent from my GT-I9300 using Tapatalk 2
I really must look into how Vanos works :redface: - I've always thought of it as BMW's Vtec equivalent but clearly it is very different. Are you saying that old oil will impede Vanos operation? Would this be an issue at very low revs?
 
#20 ·
Did you check the spark plugs when you changed the coils?

I had a very similar issue which turned out to be a loose spark plug which caused the coil it was attached to to fail. It was obvious which one it was as all the other cylinders were very shiney and the faulty one was coked up. Where all your coils clean?

Also my mpg shot back up immediatley after the repair but the jerkiness took a few weeks to go away, I put it down to the software engine mamangement adapting to the car running perfectly again.

Also isn't there a post on here somewhere about how to reset the electronic throttle with some button pushes? Might be worth a go.
 
#21 ·
I didn't have a spark plug tool that fit these plugs so I didn't take them out, but they all looked fine from the outside, and all the coils were fine. I haven't yet taken it for a long drive, just a few poots around the city. This coming weekend I'll go for a decent drive and perhaps that'll make a difference.

I have tried that whole "accelerator down for 30 seconds with the key in" which someone somewhere said recalibrated the engine management, though there appeared to be some confusion as to whether it was an automatic transmission thing or not (my car is manual). There was no apparent effect when I tried, no real surprise :D

I've found a few photos/mini guides on how to remove and clean the Vanos solenoids, but it'd be great if you could take a photo of where they are on a 130 as I'd like to get it right, Littlejohno.

Cheers!
 
#22 ·
Internev said:
I didn't have a spark plug tool that fit these plugs so I didn't take them out, but they all looked fine from the outside, and all the coils were fine. I haven't yet taken it for a long drive, just a few poots around the city. This coming weekend I'll go for a decent drive and perhaps that'll make a difference.

I have tried that whole "accelerator down for 30 seconds with the key in" which someone somewhere said recalibrated the engine management, though there appeared to be some confusion as to whether it was an automatic transmission thing or not (my car is manual). There was no apparent effect when I tried, no real surprise :D

I've found a few photos/mini guides on how to remove and clean the Vanos solenoids, but it'd be great if you could take a photo of where they are on a 130 as I'd like to get it right, Littlejohno.

Cheers!
I'll post one up this afternoon :) and it's oil that lubricates all the valve train any debris / carbon can cause issues they basically use the solenoids to control oil pressure to then control valve lift which controls air intake there is also a control unit on the plenum / inlet manifold there is no throttle body as such
Hope this helps I believe the above is right

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