Injen Intake Makes car bounce at idle?? Why

M2_MEDUSA · 10-07-2017, 05:04 PM

Hey guys so I'm not sure if there's existing threads or whatever but after installing my new injen intake on my 428i when I put it in gear in drive it'll bounce me back and forth until it gets above about 6 mph. This also occurs when I'm braking and comming to a stop it'll bounce and as soon as I let off the brake it'll bounce some more. Crazy thing is, my Rpms don't change at all when this bouncing thing occurs So what could be the issue here. As soon as I accelerate there's no bouncing occurring, it's only when comming to a stop or in idle from a stop It like throws me forward then back in my seat then forward again like 5 or 6 times. Anyone ever experience this issue with their car or previous cars in anyway shape or form? Because I can't find anything anywhere. Throttle response hasn't changed everything is fine but why is my car bouncing ??

Edit: I'm not familiar with this running lean concept, Could that cause it to shake back and forth at idleing speed, or no. It's fine as soon as I press the gas past 5-6 mph. Could my brakes be sticking ? Any help would be appreciated to anyone who knows what they are talking about. Thank you.

Shri2222 · 10-08-2017, 09:48 AM

Sounds like you have a vacuum leak, check your clamps/pipes and hoses.

Diegov209 · 10-08-2017, 02:34 PM

Quote:

Originally Posted by IssaF32

Hey guys so I'm not sure if there's existing threads or whatever but after installing my new injen intake on my 428i when I put it in gear in drive it'll bounce me back and forth until it gets above about 6 mph. This also occurs when I'm braking and comming to a stop it'll bounce and as soon as I let off the brake it'll bounce some more. Crazy thing is, my Rpms don't change at all when this bouncing thing occurs So what could be the issue here. As soon as I accelerate there's no bouncing occurring, it's only when comming to a stop or in idle from a stop It like throws me forward then back in my seat then forward again like 5 or 6 times. Anyone ever experience this issue with their car or previous cars in anyway shape or form? Because I can't find anything anywhere. Throttle response hasn't changed everything is fine but why is my car bouncing ??

Edit: I'm not familiar with this running lean concept, Could that cause it to shake back and forth at idleing speed, or no. It's fine as soon as I press the gas past 5-6 mph. Could my brakes be sticking ? Any help would be appreciated to anyone who knows what they are talking about. Thank you.

Boost leak sir make sure the intake or chargepipes are connected good. It is most likely just a leak nothing big lol

M2_MEDUSA · 10-08-2017, 07:15 PM

For some reason it happens a lot when I'm braking at low speeds

Diegov209 · 10-09-2017, 11:59 AM

Quote:

Originally Posted by IssaF32

For some reason it happens a lot when I'm braking at low speeds

When your at a stop this it jolt forward or feel like it wants to turn off also any loss in power you feel?

D041987 · 10-09-2017, 03:46 PM

Did you make sure to check and see if you have a VAC line going to the OEM intake and that you plugged it into the new one? If your car does not have a vac line, you need to cap the nipple by the filter on the Injen intake. Next would be to check your hoses and pipes and clamp them on tight.

M2_MEDUSA · 10-10-2017, 12:09 PM

Quote:

Originally Posted by Diegov209

Quote:

Originally Posted by IssaF32

For some reason it happens a lot when I'm braking at low speeds

When your at a stop this it jolt forward or feel like it wants to turn off also any loss in power you feel?

I don't experience any loss in power that I feel

M2_MEDUSA · 10-10-2017, 12:10 PM

Quote:

Originally Posted by D041987

Did you make sure to check and see if you have a VAC line going to the OEM intake and that you plugged it into the new one? If your car does not have a vac line, you need to cap the nipple by the filter on the Injen intake. Next would be to check your hoses and pipes and clamp them on tight.

I'll check my vac lines today and get back to you

Domotron · 10-12-2017, 10:39 AM

there is autotrans vac line that connects to the intake pipe.. might wanna look at that one first.

M2_MEDUSA · 10-15-2017, 10:32 PM

So my vac line is completely secure. The one next to the maf sensor

M2_MEDUSA · 10-15-2017, 11:09 PM

Pretty sure somehow my brakes are sticking

Sielth3284 · 10-16-2017, 05:47 PM

Mine has been on my 320iX since febuary. No issues at all, You might have something else going on.

10-07-2017, 05:04 PM	#1
M2_MEDUSA Major 669 Rep 1,074 Posts Drives: 2021 M2 Comp. SpecialEdition Join Date: Sep 2017 Location: Texas iTrader: (0)	Hey guys so I'm not sure if there's existing threads or whatever but after installing my new injen intake on my 428i when I put it in gear in drive it'll bounce me back and forth until it gets above about 6 mph. This also occurs when I'm braking and comming to a stop it'll bounce and as soon as I let off the brake it'll bounce some more. Crazy thing is, my Rpms don't change at all when this bouncing thing occurs So what could be the issue here. As soon as I accelerate there's no bouncing occurring, it's only when comming to a stop or in idle from a stop It like throws me forward then back in my seat then forward again like 5 or 6 times. Anyone ever experience this issue with their car or previous cars in anyway shape or form? Because I can't find anything anywhere. Throttle response hasn't changed everything is fine but why is my car bouncing ?? Edit: I'm not familiar with this running lean concept, Could that cause it to shake back and forth at idleing speed, or no. It's fine as soon as I press the gas past 5-6 mph. Could my brakes be sticking ? Any help would be appreciated to anyone who knows what they are talking about. Thank you. __________________ Instagram: M2_Medusa
	Appreciate 0 Tweet Quote

10-08-2017, 09:48 AM	#2
Shri2222 Enlisted Member 7 Rep 32 Posts Drives: 2013 328xi Join Date: Sep 2016 Location: NJ iTrader: (0)	Sounds like you have a vacuum leak, check your clamps/pipes and hoses.
	Appreciate 0 Quote

10-08-2017, 07:15 PM	#4
M2_MEDUSA Major 669 Rep 1,074 Posts Drives: 2021 M2 Comp. SpecialEdition Join Date: Sep 2017 Location: Texas iTrader: (0)	For some reason it happens a lot when I'm braking at low speeds __________________ Instagram: M2_Medusa
	Appreciate 0 Quote

10-09-2017, 03:46 PM	#6
D041987 Big Turbo Boys N Girls 327 Rep 579 Posts Drives: 2012 328I 6speed Join Date: Apr 2016 Location: Lynnwood, WA iTrader: (0)	Did you make sure to check and see if you have a VAC line going to the OEM intake and that you plugged it into the new one? If your car does not have a vac line, you need to cap the nipple by the filter on the Injen intake. Next would be to check your hoses and pipes and clamp them on tight.
	Appreciate 0 Quote

10-12-2017, 10:39 AM	#9
Domotron Captain 150 Rep 757 Posts Drives: 2014 BMW 328xi M-Sport Join Date: Feb 2013 Location: St. Louis iTrader: (2)	there is autotrans vac line that connects to the intake pipe.. might wanna look at that one first. __________________ 2014 Estoril Blue II BMW 328i xdrive ///M-Sport
	Appreciate 0 Quote

10-15-2017, 10:32 PM	#10
M2_MEDUSA Major 669 Rep 1,074 Posts Drives: 2021 M2 Comp. SpecialEdition Join Date: Sep 2017 Location: Texas iTrader: (0)	So my vac line is completely secure. The one next to the maf sensor __________________ Instagram: M2_Medusa
	Appreciate 0 Quote

10-15-2017, 11:09 PM	#11
M2_MEDUSA Major 669 Rep 1,074 Posts Drives: 2021 M2 Comp. SpecialEdition Join Date: Sep 2017 Location: Texas iTrader: (0)	Pretty sure somehow my brakes are sticking __________________ Instagram: M2_Medusa
	Appreciate 0 Quote

10-16-2017, 05:47 PM	#12
Sielth3284 Registered 0 Rep 1 Posts Drives: 2014 320iX Join Date: Mar 2017 Location: Kingston, PA iTrader: (0)	Nothing wrong with the Injen Intake Mine has been on my 320iX since febuary. No issues at all, You might have something else going on.
	Appreciate 0 Quote