Throttle sticks for a second

[thecremeegg]

Just took the M out for the first time in a while and I noticed that when I lift off the pedal the revs don't drop for a second. It's never done it before, what would it be, perhaps a sticking throttle body?

Thanks

 

[AndyBeech]

Possibly, TPS sensor could be another culprit. Be worth checking for fault codes first, may well have one that hasn't stored as an EML fault yet.

Otherwise airbox off and have a look around for any linkage that might need some lube, clean out ICV and the throttle bodies while you are in there. Not too bad of a job and good to do once in a while in any case.

 

[thecremeegg]

Ok cool thanks, I'll have a poke at that tomorrow!

 

[RedUn]

If your taking the airbox off you might as well do the tps down there at the same time, 30 quid for a new one, infact do them both

 

[AndyBeech]

If your taking the airbox off you might as well do the tps down there at the same time, 30 quid for a new one, infact do them both

Agreed if it's never been done, worth doing. £30 though, you sure? Thought more like £100 these days I wouldn't go anything other than Genuine with TPS's, heard bad things about copies.

 

[RedUn]

If your taking the airbox off you might as well do the tps down there at the same time, 30 quid for a new one, infact do them both

Agreed if it's never been done, worth doing. £30 though, you sure? Thought more like £100 these days I wouldn't go anything other than Genuine with TPS's, heard bad things about copies.

They've gone up, used to be 30 each for the oem Hella :|

BTW, have you seen the price of OEM wiper blades now :?

 

[AndyBeech]

If your taking the airbox off you might as well do the tps down there at the same time, 30 quid for a new one, infact do them both

Agreed if it's never been done, worth doing. £30 though, you sure? Thought more like £100 these days I wouldn't go anything other than Genuine with TPS's, heard bad things about copies.

They've gone up, used to be 30 each for the oem Hella :|

BTW, have you seen the price of OEM wiper blades now :?

Don't dare look! I only say about the TPS sensors as there was a thread on Cutters recently someone saying Hella don't make them anymore so you can't get the OEM copies cheaper like you could I vaguely remember someone saying BMW want around £100 for one now.
Hoping I don't need to replace anything like that soon, M tax getting out of control :lol:

 

[Justino]

Thats a pain Hella not making them anymore as I need 2 - last price for them on Autodoc was £52, so roughly half the price of BMW.

If Hella no longer make them, I wonder who is the OEM supplier now?

 

[a340driver]

I had a similar hesitant throttle and BMW fixed it by a no cost to me fix which according to the head tech basically involved cycling the accelerator pedal sensor was playing up. I suspect they just sprayed it with contact cleaner and wiggled it a lot.

 

[RedUn]

Agreed if it's never been done, worth doing. £30 though, you sure? Thought more like £100 these days I wouldn't go anything other than Genuine with TPS's, heard bad things about copies.

They've gone up, used to be 30 each for the oem Hella :|

BTW, have you seen the price of OEM wiper blades now :?

Don't dare look! I only say about the TPS sensors as there was a thread on Cutters recently someone saying Hella don't make them anymore so you can't get the OEM copies cheaper like you could I vaguely remember someone saying BMW want around £100 for one now.
Hoping I don't need to replace anything like that soon, M tax getting out of control :lol:

I guess the cars are getting to that age now, I've replaced a lot of the sensors, knock sensors coil packs to keep it running sweet. Exhaust mounts next... Don't look how much they are :rofl:

 

[Shakespeares]

Agreed if it's never been done, worth doing. £30 though, you sure? Thought more like £100 these days I wouldn't go anything other than Genuine with TPS's, heard bad things about copies.

They've gone up, used to be 30 each for the oem Hella :|

BTW, have you seen the price of OEM wiper blades now :?

Don't dare look! I only say about the TPS sensors as there was a thread on Cutters recently someone saying Hella don't make them anymore so you can't get the OEM copies cheaper like you could I vaguely remember someone saying BMW want around £100 for one now.
Hoping I don't need to replace anything like that soon, M tax getting out of control :lol:

I bought one for 32USD earlier this year. Cannot find the same price last week. I spent 62 this time

 

[MrPT]

As a quick test once the plenum is off, take the linkage off the throttle actuator and manually open/close the throttle bodies.

You will be able to feel of there is any mechanical resistance which, as above, can often be remedied by cleaning and lubricating the ITBs and/or their shaft bearings. It should feel effortless and they should close with a satisfying “thunk”.

If it’s the shaft bearings that are sticky, you will probably only be able to fix the issue temporarily (especially in winter!), as what is really needed is a full rebuild of the assembly with new or re-greased needle bearings. Don’t have the link handy, but this is documented elsewhere on the forum.

 

[thecremeegg]

Thanks for this, I'll get the guy that's currently doing the head gasket to take a look at that whilst it's all apart

 

[PDJ]

cycling the accelerator pedal sensor was playing up. I suspect they just sprayed it with contact cleaner and wiggled it a lot.

I was going to suggest the fly by wire throttle peddle