Need advice--fuel pump?

V TACH · 11-02-2015, 08:53 PM

Can someone watch this video and give me a few ideas on what I should tell the dealership to check for?

It has had this very erratic idle on 3 different occasions in the past 10k miles but it won't throw a check engine light so the dealer says everything checks out. It generally will resolve after I let the car sit for a bit. Also, I recently had the charge pipe replaced and now the car runs at ~85% of the prior performance. The drop in performance is so subtle the dealer says it drives fine however I can feel hesitation when I shift gears--almost like it has more turbo lag than usual. Thoughts???? Are the two things related?
Thanks in advance--
Vivek

hot-j · 11-02-2015, 09:43 PM

Colapsed cats.

ronster · 11-02-2015, 10:57 PM

Coils or plugs?

MDORPHN · 11-03-2015, 08:19 AM

How many miles? Any modifications? What maintenance performed?

Neil

craina · 11-03-2015, 09:44 AM

Have the dealer check the injectors. I bet one or more of them has gone bad and that is causing a misfire.

aamelin · 11-03-2015, 01:10 PM

Coils, plugs, injectors or HPFP.

Had a same issue and resolved it with plugs changing.
As i know injectors and HPFP issues should turn on check engine light

Old plugs:

V TACH · 11-03-2015, 08:53 PM

Thanks for the input guys. All scheduled services are up to date and the car is stock with the exception of the dealer installed exhaust. It sounds like they are going to change the plugs and go from there. It's a bit unfortunate in terms of timing as my warranty ran out last week. They assure me that I will be take care of regardless yet they cannot find anything wrong since the car is not throwing a code. I appreciate your input!
VG

T1M · 11-04-2015, 06:21 AM

Wow that's really rough! As above, coils, plugs or injectors, possibly HPFP but they should go through one by one and eliminate each. No codes aside, it's very disappointing that you can take a car running that badly into a dealership that apparently specialises in that make of vehicle and they send you on your way, unable to assist.

Charge pipe - possibly related yes, have all the connection checked for vacuum leaks but even so it shouldn't cause a missfire (vacuum leak will usually cause the idle to 'hunt' around (rise/fall)). If it's leaking boost the boost the engine sees will be reduced thus your power will also be reduced.

blackmist222777 · 11-06-2015, 02:14 PM

Quote:

Originally Posted by V TACH

Can someone watch this video and give me a few ideas on what I should tell the dealership to check for?

It has had this very erratic idle on 3 different occasions in the past 10k miles but it won't throw a check engine light so the dealer says everything checks out. It generally will resolve after I let the car sit for a bit. Also, I recently had the charge pipe replaced and now the car runs at ~85% of the prior performance. The drop in performance is so subtle the dealer says it drives fine however I can feel hesitation when I shift gears--almost like it has more turbo lag than usual. Thoughts???? Are the two things related?
Thanks in advance--
Vivek

update us once you figure it out. GL!

V TACH · 11-06-2015, 04:05 PM

The rough idle has only occurred on three occasions then quickly resolves so it's hard to say if it's really fixed. The plugs were changed so we will see what happens. The turbo lag is still apparent after the charge pipe was changed and it never did this before. I'm wondering if they installed it incorrectly. I am going to have the shop foreman drive it soon and I will provide updates accordingly. Thanks again for all of your help!

11-02-2015, 08:53 PM	#1
V TACH Private 6 Rep 53 Posts Drives: 1M, Exige S260 Sport Join Date: Aug 2011 Location: Texas iTrader: (0)	Need advice--fuel pump? Can someone watch this video and give me a few ideas on what I should tell the dealership to check for? It has had this very erratic idle on 3 different occasions in the past 10k miles but it won't throw a check engine light so the dealer says everything checks out. It generally will resolve after I let the car sit for a bit. Also, I recently had the charge pipe replaced and now the car runs at ~85% of the prior performance. The drop in performance is so subtle the dealer says it drives fine however I can feel hesitation when I shift gears--almost like it has more turbo lag than usual. Thoughts???? Are the two things related? Thanks in advance-- Vivek
	Appreciate 0 Tweet Quote

11-02-2015, 09:43 PM	#2
hot-j First Lieutenant 98 Rep 309 Posts Drives: 1M Join Date: Sep 2015 Location: Boston MA iTrader: (0)	Colapsed cats.
	Appreciate 0 Quote

11-02-2015, 10:57 PM	#3
ronster Lieutenant 16 Rep 421 Posts Drives: 2011 1M VO Join Date: Mar 2009 Location: Toronto iTrader: (0)	Coils or plugs? __________________ 2011 1M VO stripper 2009 AW 135i M-sp (sold) 2002 SG MINI Cooper (sold)
	Appreciate 0 Quote

11-03-2015, 08:19 AM	#4
MDORPHN Colonel 291 Rep 2,898 Posts Drives: AW 1M Join Date: Oct 2010 Location: Wash, DC iTrader: (0)	How many miles? Any modifications? What maintenance performed? Neil
	Appreciate 0 Quote

11-03-2015, 09:44 AM	#5
craina Second Lieutenant 77 Rep 220 Posts Drives: 2020 m2c Join Date: Feb 2012 Location: Houston, TX iTrader: (1)	Have the dealer check the injectors. I bet one or more of them has gone bad and that is causing a misfire.
	Appreciate 0 Quote

11-03-2015, 01:10 PM	#6
aamelin New Member 13 Rep 20 Posts Drives: BMW 1M Join Date: Jul 2015 Location: Moscow, Russia iTrader: (0)	Coils, plugs, injectors or HPFP. Had a same issue and resolved it with plugs changing. As i know injectors and HPFP issues should turn on check engine light Old plugs:
	Appreciate 0 Quote

11-03-2015, 08:53 PM	#7
V TACH Private 6 Rep 53 Posts Drives: 1M, Exige S260 Sport Join Date: Aug 2011 Location: Texas iTrader: (0)	Thanks for the input guys. All scheduled services are up to date and the car is stock with the exception of the dealer installed exhaust. It sounds like they are going to change the plugs and go from there. It's a bit unfortunate in terms of timing as my warranty ran out last week. They assure me that I will be take care of regardless yet they cannot find anything wrong since the car is not throwing a code. I appreciate your input! VG
	Appreciate 0 Quote

11-04-2015, 06:21 AM	#8
T1M Captain 196 Rep 657 Posts Drives: AW MY12 1M Join Date: Jun 2015 Location: Melbourne, Australia iTrader: (0)	Wow that's really rough! As above, coils, plugs or injectors, possibly HPFP but they should go through one by one and eliminate each. No codes aside, it's very disappointing that you can take a car running that badly into a dealership that apparently specialises in that make of vehicle and they send you on your way, unable to assist. Charge pipe - possibly related yes, have all the connection checked for vacuum leaks but even so it shouldn't cause a missfire (vacuum leak will usually cause the idle to 'hunt' around (rise/fall)). If it's leaking boost the boost the engine sees will be reduced thus your power will also be reduced.
	Appreciate 0 Quote

11-06-2015, 04:05 PM	#10
V TACH Private 6 Rep 53 Posts Drives: 1M, Exige S260 Sport Join Date: Aug 2011 Location: Texas iTrader: (0)	The rough idle has only occurred on three occasions then quickly resolves so it's hard to say if it's really fixed. The plugs were changed so we will see what happens. The turbo lag is still apparent after the charge pipe was changed and it never did this before. I'm wondering if they installed it incorrectly. I am going to have the shop foreman drive it soon and I will provide updates accordingly. Thanks again for all of your help!
	Appreciate 0 Quote