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      06-01-2020, 09:14 PM   #1
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Hesitation when jabbing throttle at idle quickly...

Hey guys, so my car runs perfectly so far except for a little odd behavior that my E39 M5 also exhibits.

I pulled into work yesterday and my co-worker wanted to hear the exhaust, so I jabbed the throttle real quick and the engine seems to stutter for a split second before revving up normally.

If I don't jab the throttle super quickly, the car revs up fine, it's when I stab quickly from idle/neutral that the motor seems to hesitate a split second and then revs up. I noticed my E39 M5 does this as well.

Does it have anything to do with the ITB's behavior? Anybody else have this behavior on their E9x M3s?

Last edited by DanMpower; 06-02-2020 at 02:22 PM..
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      06-01-2020, 09:19 PM   #2
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Quote:
Originally Posted by DanMpower View Post
Hey guys, so my car runs perfectly so far except for a little odd behavior that my E39 M5 also exhibits.

I pulled into work yesterday and my co-worker wanted to hear the exhaust, so I jabbed the throttle real quick and the engine seems to stutter for a split second then it revved up.

If I don't jab the throttle super quickly, the car revs up fine, it's when I stab it as fast as I can from idle/neutral that the motor seems to hesitate a split second bit and then revs up. I noticed my E39 M5 does this as well.

Does it have anything to do with the ITB's behavior? Anybody else have this behavior on their E9x M3s?
Happened to me when throttle actuator was failing. Have you replaced?
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      06-01-2020, 11:03 PM   #3
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Quote:
Originally Posted by Powashiftin View Post
Happened to me when throttle actuator was failing. Have you replaced?
The car has 66k miles on original TAs so that might be it! Did your car seem to stumble a split second then rev up?
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      06-02-2020, 12:37 AM   #4
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How old are the sparkplugs and air filter?
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      06-02-2020, 12:57 AM   #5
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Quote:
Originally Posted by Willem3 View Post
How old are the sparkplugs and air filter?
Sparkplugs are original I think and I just replaced the air filter with a K&N drop-in.

Here is a quick video I took, you can hear the engine stumble a bit when I jab the throttle from idle.

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      06-02-2020, 01:49 AM   #6
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I had the same the hesitation before, changed the air filter and sparkplugs and it was gone.
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      06-02-2020, 03:08 AM   #7
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Quote:
Originally Posted by Willem3 View Post
I had the same the hesitation before, changed the air filter and sparkplugs and it was gone.
Okay cool, just ordered new plugs.
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      06-02-2020, 08:26 AM   #8
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Quote:
Originally Posted by DanMpower View Post
Quote:
Originally Posted by Willem3 View Post
How old are the sparkplugs and air filter?
Sparkplugs are original I think and I just replaced the air filter with a K&N drop-in.

Here is a quick video I took, you can hear the engine stumble a bit when I jab the throttle from idle.

Quote:
Originally Posted by DanMpower View Post
Quote:
Originally Posted by Powashiftin View Post
Happened to me when throttle actuator was failing. Have you replaced?
The car has 66k miles on original TAs so that might be it! Did your car seem to stumble a split second then rev up?

Yes. Exactly like your video. Do you have the Carly app and adapter? Do a diagnostic and see if any codes pop up. I'm almost certain it's one or both TA's. DIY and order from FCP euro.

The DIY is not difficult and very satisfying. Especially knowing how much labor charges are for something like this. To me, removing the plenum and airbox/filter are the most time consuming.
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      06-02-2020, 08:38 AM   #9
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Original spark plugs at 66k miles? That's almost double the too-long factory interval. Jesus.
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      06-02-2020, 10:14 AM   #10
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Quote:
Originally Posted by Richbot View Post
Original spark plugs at 66k miles? That's almost double the too-long factory interval. Jesus.
Yeah I'm not sure since I just recently purchased the car and it didn't include any service records besides those listed in Carfax, which doesn't list sparkplugs as being changed.
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      06-02-2020, 10:22 AM   #11
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Quote:
Originally Posted by Powashiftin View Post
Quote:
Originally Posted by DanMpower View Post
Quote:
Originally Posted by Willem3 View Post
How old are the sparkplugs and air filter?
Sparkplugs are original I think and I just replaced the air filter with a K&N drop-in.

Here is a quick video I took, you can hear the engine stumble a bit when I jab the throttle from idle.

Quote:
Originally Posted by DanMpower View Post
Quote:
Originally Posted by Powashiftin View Post
Happened to me when throttle actuator was failing. Have you replaced?
The car has 66k miles on original TAs so that might be it! Did your car seem to stumble a split second then rev up?

Yes. Exactly like your video. Do you have the Carly app and adapter? Do a diagnostic and see if any codes pop up. I'm almost certain it's one or both TA's. DIY and order from FCP euro.

The DIY is not difficult and very satisfying. Especially knowing how much labor charges are for something like this. To me, removing the plenum and airbox/filter are the most time consuming.
Thanks brother, yeah I did the TAs myself on my previous E92 M3, very easy job.

I just ordered two TAs and a full set of plugs, hopefully that will solve the issue.
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      06-02-2020, 12:03 PM   #12
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I would have recommended Jason @rebuild.org for TAs. Better to replace with his and not have to worry about them again. Cheaper than everywhere else too and lifetime warranty
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      06-02-2020, 02:20 PM   #13
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I would have recommended Jason @rebuild.org for TAs. Better to replace with his and not have to worry about them again. Cheaper than everywhere else too and lifetime warranty
That's exactly where I ordered from, well the US distributor for Jason, Mpower Motorsports.
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      06-06-2020, 04:34 PM   #14
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Quote:
Originally Posted by DanMpower View Post
Hey guys, so my car runs perfectly so far except for a little odd behavior that my E39 M5 also exhibits.

I pulled into work yesterday and my co-worker wanted to hear the exhaust, so I jabbed the throttle real quick and the engine seems to stutter for a split second before revving up normally.

If I don't jab the throttle super quickly, the car revs up fine, it's when I stab quickly from idle/neutral that the motor seems to hesitate a split second and then revs up. I noticed my E39 M5 does this as well.

Does it have anything to do with the ITB's behavior? Anybody else have this behavior on their E9x M3s?
It could be that the throttle body shafts (the long shafts that the actuators attach to) are seizing up. Read a comment on here about a buddy noticing that the shaft was stiff to turn and lubed it up.

I thought I didnt have any issue, but used the WD-40 when I was last in there and it's made such a difference - seems like the throttle response is so much better. Could save your (new) Throttle Actuators in the long term too.

I noticed a difference mostly on gear changes and slipping the clutch at really low speed.
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      06-10-2020, 04:19 AM   #15
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A little update, changed the spark plugs and the hesitation is completely GONE. The engine revs super smooth and responsive. Thanks for the help guys.

I think the plugs were original. What do you guys think?
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      06-10-2020, 04:40 AM   #16
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20k intervals. Also check your air filter sir.
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      06-10-2020, 09:12 AM   #17
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Those have another 50k in them easily

I like how one of the suggestions was "change the throttle actuators" when basic maintenance hadn't been addressed. Never change, internet
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      06-10-2020, 09:21 AM   #18
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Quote:
Originally Posted by Richbot View Post
Those have another 50k in them easily

I like how one of the suggestions was "change the throttle actuators" when basic maintenance hadn't been addressed. Never change, internet
Its probably RBs, best to start with an engine swap and see if that fixes it.
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      06-11-2020, 12:24 PM   #19
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i just had this a few days ago. i wasn't quick jabbing but i was on the throttle like normal driving then give it a bit more (like when you are overtaking), then the car started to hesitate/stutter a little bit (0.5s) and then keep on climbing.

I guess i should check spark plugs and air filter first. what do u guys think?
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