Car hesitates after installing intake/cp/dp

sickF30 · 03-06-2017, 10:48 AM

I installed an Injen intake and ER CP/DP this weekend and I'm getting a hesitation during part throttle. It seems as if the car has a hiccup, hahaha. I have a JB4 that I need to install, ran out of time/energy when I installed everything else.

Before I put it on, I want to resolve this issue first. I've seen where some people have unplugged their MAF because of aftermarket intake issues. Should I give that a try?

mbanks21 · 03-06-2017, 11:22 AM

Absolutely try unplugging the MAF sensor before doing anything else

mr_kay · 03-06-2017, 11:50 AM

I believe you can only unplug the MAF when running a tune such as a JB4...I don't think the stock DME signals would be okay with running MAF less. Double check for boost leaks, specifically the o-rings on the charge pipe.

mbanks21 · 03-06-2017, 12:08 PM

Quote:

Originally Posted by mr_kay

I believe you can only unplug the MAF when running a tune such as a JB4...I don't think the stock DME signals would be okay with running MAF less. Double check for boost leaks, specifically the o-rings on the charge pipe.

I misread that part, thought he had JB4 already. Def check the CP for leaks. MAF should be ok with stock tune

sickF30 · 03-06-2017, 01:33 PM

you know what, i think i forgot to put the o-ring back in the cp. fml

sickF30 · 03-06-2017, 02:26 PM

is there supposed to be an o-ring on the throttle body side of the cp?

when i took my stock cp off, it didn't have one at the top. i did move the o-ring on the intercooler side over to the new cp.

also, im wondering if an exhaust leak could be the issue because it sounds like there is an exhaust leak.

yoandry · 03-06-2017, 02:42 PM

Quote:

Originally Posted by sickF30

is there supposed to be an o-ring on the throttle body side of the cp?

when i took my stock cp off, it didn't have one at the top. i did move the o-ring on the intercooler side over to the new cp.

also, im wondering if an exhaust leak could be the issue because it sounds like there is an exhaust leak.

Both sides have O rings. CHeck inside your oem bt cp

GTBrandon · 03-06-2017, 02:50 PM

Quote:

Originally Posted by sickF30

I installed an Injen intake and ER CP/DP this weekend and I'm getting a hesitation during part throttle. It seems as if the car has a hiccup, hahaha. I have a JB4 that I need to install, ran out of time/energy when I installed everything else.

Before I put it on, I want to resolve this issue first. I've seen where some people have unplugged their MAF because of aftermarket intake issues. Should I give that a try?

Have you checked spark plugs as well?

sickF30 · 03-06-2017, 03:17 PM

i haven't checked the spark plugs, but this only started happening saturday after i installed the mods.

im swinging by the dealership after work today to get an o-ring

mr_kay · 03-06-2017, 03:23 PM

A boost leak can sound pretty similar to some exhaust leaks. Re-evaluate after you put in the new o-ring.

anrec330 · 03-06-2017, 04:35 PM

I had this issue also. It's your intake. I installed the jb4 and unplugged the maf and it went away.

mine would occur when partially on the throttle, around 3-4krpms it would hesitate and then abruptly pick up speed. As if I had instantly hit a wall of boost.

yoandry · 03-06-2017, 05:09 PM

Seems that most of the issues are open intake. When I got my bms intake I had the same hesitation issue when my car was stock. A week after, I sold the bms intake and I got the afe momentum pro intake that is sealed and issue was resolved.

sickF30 · 03-11-2017, 07:11 PM

installed my jb4 today and the problem is less dramatic. i'll pull the plug on the maf tomorrow and see how that works out.

jgoens · 03-11-2017, 10:33 PM

Would not worry a great deal if you have an exhaust leak--I had a small on on my DP and it was just a sound. You can re-seat the DP later. Most likely there is an issue with the intake. Once again this is why I always say to install one mod at a time as you will know the variable--you have 3 items to evaluate in this case.

sickF30 · 03-12-2017, 09:36 AM

Quote:

Originally Posted by jgoens

Once again this is why I always say to install one mod at a time as you will know the variable--you have 3 items to evaluate in this case.

This would have never worked when I built the engine myself on my last car. That 6 month rebuild would have taken years doing one thing at a time. lol

jgoens · 03-12-2017, 11:29 AM

Quote:

Originally Posted by sickF30

This would have never worked when I built the engine myself on my last car. That 6 month rebuild would have taken years doing one thing at a time. lol

Referring to common performance mods--an engine rebuild is a whole different thing.

sickF30 · 03-20-2017, 01:08 PM

just updating the thread for documentation purposes, unplugging the maf after i installed the jb4 fixed this issue.

GTBrandon · 03-20-2017, 05:29 PM

Quote:

Originally Posted by sickF30

just updating the thread for documentation purposes, unplugging the maf after i installed the jb4 fixed this issue.

Glad to hear the issue is resolved. Maybe look into the implications of leaving MAF unplugged long term as I would assume they have it for a reason

izaazk · 03-20-2017, 05:47 PM

Hey everyone...

sorry to sound nooby... which one is the MAF?? the one on the intake (BMS INTAKE for me) ... the wide black plug?

I have the same issue with BMS intake and catless DP... no JB4 yet (being shipped atm)

mr_kay · 03-20-2017, 05:57 PM

Quote:

Originally Posted by izaazk

Hey everyone...

sorry to sound nooby... which one is the MAF?? the one on the intake (BMS INTAKE for me) ... the wide black plug?

I have the same issue with BMS intake and catless DP... no JB4 yet (being shipped atm)

Yes

sicmadek · 03-20-2017, 09:48 PM

Ive been having jb4 for a while but i just installed a bms intake last week. I havent noticed anything weird except for a stumble when i floor it during 3rd gear logs. Stumbles/bogs then takes off fine.

jaymax · 03-21-2017, 09:49 AM

i recently did similar mods with ER FMIC + DP + CP+ TIC running on JB4 map4, i have the same hesitation as well normally at 3k++ the power just releases upon hitting this RPM. I did not change the intake, does it mean that i can remove the MAF as well from my intake and i would get a smooth power/torque curve.

i also posted my logs to BMS and there does not seem to be any boost leak but i have been asked to provide another log with a wider RPM band to be sure. I'm hitting max 23-24psi of boost in my logs but the hesitation is unberable for me. and there seems to be some turbo lag at lower RPM, im suspecting the FMIC is too large compared to the stock version which has very minimal turbo lag

03-06-2017, 10:48 AM	#1
sickF30 Private First Class 54 Rep 181 Posts Drives: F30 335i Join Date: Nov 2016 Location: Dallas, TX iTrader: (0)	Car hesitates after installing intake/cp/dp I installed an Injen intake and ER CP/DP this weekend and I'm getting a hesitation during part throttle. It seems as if the car has a hiccup, hahaha. I have a JB4 that I need to install, ran out of time/energy when I installed everything else. Before I put it on, I want to resolve this issue first. I've seen where some people have unplugged their MAF because of aftermarket intake issues. Should I give that a try?
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03-06-2017, 11:22 AM	#2
mbanks21 Colonel 1268 Rep 2,948 Posts Drives: 2015 335i MSport Join Date: Aug 2013 Location: High Bridge, NJ iTrader: (8)	Absolutely try unplugging the MAF sensor before doing anything else
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03-06-2017, 11:50 AM	#3
mr_kay First Lieutenant 126 Rep 367 Posts Drives: F30 335i Join Date: May 2014 Location: NYC iTrader: (0)	I believe you can only unplug the MAF when running a tune such as a JB4...I don't think the stock DME signals would be okay with running MAF less. Double check for boost leaks, specifically the o-rings on the charge pipe.
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03-06-2017, 01:33 PM	#5
sickF30 Private First Class 54 Rep 181 Posts Drives: F30 335i Join Date: Nov 2016 Location: Dallas, TX iTrader: (0)	you know what, i think i forgot to put the o-ring back in the cp. fml
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03-06-2017, 02:26 PM	#6
sickF30 Private First Class 54 Rep 181 Posts Drives: F30 335i Join Date: Nov 2016 Location: Dallas, TX iTrader: (0)	is there supposed to be an o-ring on the throttle body side of the cp? when i took my stock cp off, it didn't have one at the top. i did move the o-ring on the intercooler side over to the new cp. also, im wondering if an exhaust leak could be the issue because it sounds like there is an exhaust leak.
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03-06-2017, 03:17 PM	#9
sickF30 Private First Class 54 Rep 181 Posts Drives: F30 335i Join Date: Nov 2016 Location: Dallas, TX iTrader: (0)	i haven't checked the spark plugs, but this only started happening saturday after i installed the mods. im swinging by the dealership after work today to get an o-ring
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03-06-2017, 03:23 PM	#10
mr_kay First Lieutenant 126 Rep 367 Posts Drives: F30 335i Join Date: May 2014 Location: NYC iTrader: (0)	A boost leak can sound pretty similar to some exhaust leaks. Re-evaluate after you put in the new o-ring.
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03-06-2017, 04:35 PM	#11
anrec330 Private First Class 43 Rep 100 Posts Drives: 335i Join Date: Jun 2016 Location: CA iTrader: (0)	I had this issue also. It's your intake. I installed the jb4 and unplugged the maf and it went away. mine would occur when partially on the throttle, around 3-4krpms it would hesitate and then abruptly pick up speed. As if I had instantly hit a wall of boost.
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03-06-2017, 05:09 PM	#12
yoandry Colonel 691 Rep 2,082 Posts Drives: G80 M3CX & X5 M50i Join Date: Jan 2011 Location: Naples, FL iTrader: (0)	Seems that most of the issues are open intake. When I got my bms intake I had the same hesitation issue when my car was stock. A week after, I sold the bms intake and I got the afe momentum pro intake that is sealed and issue was resolved. __________________
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03-11-2017, 07:11 PM	#13
sickF30 Private First Class 54 Rep 181 Posts Drives: F30 335i Join Date: Nov 2016 Location: Dallas, TX iTrader: (0)	installed my jb4 today and the problem is less dramatic. i'll pull the plug on the maf tomorrow and see how that works out.
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03-11-2017, 10:33 PM	#14
jgoens Major General 3788 Rep 5,776 Posts Drives: 2013 335i msport Join Date: Nov 2014 Location: San Mateo, CA iTrader: (0)	Would not worry a great deal if you have an exhaust leak--I had a small on on my DP and it was just a sound. You can re-seat the DP later. Most likely there is an issue with the intake. Once again this is why I always say to install one mod at a time as you will know the variable--you have 3 items to evaluate in this case. __________________ 2013 335i Msport Black sapphire/Coral red. MHD. stage 2--e30 VRSF DP, ER CP, Dinan Shockware. VRSF 12mm/15mm spacers. Cobra dashcam. Various codings. Last car: 2011 335i Msport. JB4. Vrsf CP
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03-20-2017, 01:08 PM	#17
sickF30 Private First Class 54 Rep 181 Posts Drives: F30 335i Join Date: Nov 2016 Location: Dallas, TX iTrader: (0)	just updating the thread for documentation purposes, unplugging the maf after i installed the jb4 fixed this issue.
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03-20-2017, 05:47 PM	#19
izaazk Captain 140 Rep 625 Posts Drives: 2013 335i Join Date: Aug 2016 Location: Chicago, Illinois iTrader: (1)	Hey everyone... sorry to sound nooby... which one is the MAF?? the one on the intake (BMS INTAKE for me) ... the wide black plug? I have the same issue with BMS intake and catless DP... no JB4 yet (being shipped atm)
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03-20-2017, 09:48 PM	#21
sicmadek Captain 223 Rep 693 Posts Drives: 2013 335i sportline Join Date: Dec 2016 Location: louisiana iTrader: (0)	Ive been having jb4 for a while but i just installed a bms intake last week. I havent noticed anything weird except for a stumble when i floor it during 3rd gear logs. Stumbles/bogs then takes off fine.
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03-21-2017, 09:49 AM	#22
jaymax F30 328i Msports N20+ERDP+CP+TIC+FMIC+MPE+ JB4 14 Rep 80 Posts Drives: F82 M4 BM3 Stage 2 Join Date: Sep 2009 Location: MY iTrader: (1)	i recently did similar mods with ER FMIC + DP + CP+ TIC running on JB4 map4, i have the same hesitation as well normally at 3k++ the power just releases upon hitting this RPM. I did not change the intake, does it mean that i can remove the MAF as well from my intake and i would get a smooth power/torque curve. i also posted my logs to BMS and there does not seem to be any boost leak but i have been asked to provide another log with a wider RPM band to be sure. I'm hitting max 23-24psi of boost in my logs but the hesitation is unberable for me. and there seems to be some turbo lag at lower RPM, im suspecting the FMIC is too large compared to the stock version which has very minimal turbo lag
	Appreciate 0 Quote

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