Cold start bogging and RPM jumping

WonWunONE · 09-29-2012, 01:11 PM

2008 135i w/ catless downpipes and exhaust, dinan tune, DCI.

Recently had a recall on my injectors and HPFP.

They replaced the fuel pump and 5 of the 6 injectors and now on cold starts the RPMs jump, it sounds like it bogging/about to die.

Any thoughts?

crex · 10-02-2012, 06:09 AM

Mine does the same thing but I hadn't had any work done recently. I did have the injectors and fuel pump replaced many miles ago. I figured it was the carbon buildup starting to rear its ugly head.

1speedbike · 10-02-2012, 10:42 AM

When you say the "RPMs jump" do you mean like this?

ragingpanda · 10-02-2012, 12:57 PM

Are you throwing any codes?

ivanavyE82 · 10-02-2012, 01:14 PM

It must be the HPFP again, mine was replaced twice and now it works fine

WonWunONE · 10-03-2012, 10:35 AM

Quote:

Originally Posted by 1speedbike

When you say the "RPMs jump" do you mean like this?

Similar to this but not as extensive.

And I'm only throwing the o2 sensor code from catless down pipes.

I put in petrocan 94 and it seems to have almost completely stopped. I'm
Thinking maybe I had some bad gas?

BostonBeemah · 10-03-2012, 04:30 PM

same with me. I had this issue and filled up with different gas and the problem went away..

blakelocati · 10-03-2012, 05:37 PM

Quote:

Originally Posted by BostonBeemah

same with me. I had this issue and filled up with different gas and the problem went away..

oh. that's scary. who did you fill up with that had caused the problem?

WonWunONE · 10-03-2012, 10:19 PM

I WAS using Esso91 then I put in Petrocan94, today I put in Shell91 and I'll update this the next time I start it from a cold start.

09-29-2012, 01:11 PM	#1
WonWunONE UMADBRO? 11 Rep 188 Posts Drives: AW 135i Join Date: May 2008 Location: Alberta, CAN iTrader: (0)	Cold start bogging and RPM jumping 2008 135i w/ catless downpipes and exhaust, dinan tune, DCI. Recently had a recall on my injectors and HPFP. They replaced the fuel pump and 5 of the 6 injectors and now on cold starts the RPMs jump, it sounds like it bogging/about to die. Any thoughts? __________________ 2008 BMW 135i Dinan 325whp and 345wtq on a parking lot dyno at 28*Celcius
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10-02-2012, 06:09 AM	#2
crex Captain 53 Rep 659 Posts Drives: bmw 135i, Jeep wrangler Join Date: Nov 2005 Location: NOVA iTrader: (1)	Mine does the same thing but I hadn't had any work done recently. I did have the injectors and fuel pump replaced many miles ago. I figured it was the carbon buildup starting to rear its ugly head.
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10-02-2012, 10:42 AM	#3
1speedbike Brigadier General 732 Rep 3,274 Posts Drives: 2022 X4 M40i, 2008 135i Join Date: Jun 2008 Location: MKE iTrader: (15)	When you say the "RPMs jump" do you mean like this? __________________ 2022 X4 M40i - 2008 135i - 2015 F700GS On Order - 2024 i4 M50 Scruffy's gonna die the way he lived... Mmhm.
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10-02-2012, 12:57 PM	#4
ragingpanda Banned 321 Rep 751 Posts Drives: 135i Join Date: May 2012 Location: Florida iTrader: (0)	Are you throwing any codes?
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10-02-2012, 01:14 PM	#5
ivanavyE82 New Member 1 Rep 18 Posts Drives: 2010 135i M sport, 2005 S2000 Join Date: Oct 2012 Location: Blacksburg, VA iTrader: (0)	It must be the HPFP again, mine was replaced twice and now it works fine
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10-03-2012, 04:30 PM	#7
BostonBeemah Lieutenant 72 Rep 524 Posts Drives: AW 135i 6spd Join Date: Sep 2011 Location: Belmont, Ma iTrader: (4)	same with me. I had this issue and filled up with different gas and the problem went away.. __________________ 2010 AW/BLK 135i VM 6465 Single Turbo, JB4 + MHD, VRSF CP & Tial, Big Tom, Fuel-It PI + Stage 3 + Return + Ethanol Sensor, BMW PE, MFactory LSD, Spec 3+ & MFactory SMFW, RB External PCV Best stock turbo 12.5 @ 19.46 spinning all the way down RIP 2008 AW/BL 135i
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10-03-2012, 10:19 PM	#9
WonWunONE UMADBRO? 11 Rep 188 Posts Drives: AW 135i Join Date: May 2008 Location: Alberta, CAN iTrader: (0)	I WAS using Esso91 then I put in Petrocan94, today I put in Shell91 and I'll update this the next time I start it from a cold start. __________________ 2008 BMW 135i Dinan 325whp and 345wtq on a parking lot dyno at 28*Celcius
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