BMW 330d

ShoCk_ · 06-15-2019, 06:18 AM

Something very strange is happening to my car.

When ever I put my foot down the car launches itself forward as the boost kicks in at 2-2.5rpm

But for some reason it doesn't do this as aggressively anymore, it's lagging. There seems to be boost when i'm at 70-80mph though so higher up in the rev range it feels normal.

I recently had a brand new alternator & battery installed. Car has also had a full service.

No fault codes, or errors.

Bad batch of fuel ? are there any additives / potions I can feed the car to clean up it's insides ?

I do a lot of regular in town driving and rarely go on the motorway.

Car is Stage 2 with the DPF gutted by Avon Tuning in Bristol.

Tambohamilton · 06-15-2019, 07:22 AM

I'd suspect boost leak, or actuator issues...more likely the former, from the description you gave. I'd check all hoses and connectors attached to the inlet, between the engine and the turbo.

Hopefully it's something simple like that.

Good luck

mjn77 · 06-15-2019, 07:24 AM

Boost leak. Check every hose and fixing.

N5GKP · 06-15-2019, 03:21 PM

I'd check the turbo VNT actuator linkage with the vehicle running to make sure it actually moves freely when reviving the engine up. Also check for any signs of carbon build up where the linkage actually connects to the VNT fins inside the turbo, if you can see signs of carbon blow by then that could potentially be your issue.

06-15-2019, 06:18 AM	#1
ShoCk_ Private 19 Rep 98 Posts Drives: BMW E90 330d SE Join Date: Apr 2017 Location: UK iTrader: (0)	BMW 330d - lost it's low down boost ? Something very strange is happening to my car. When ever I put my foot down the car launches itself forward as the boost kicks in at 2-2.5rpm But for some reason it doesn't do this as aggressively anymore, it's lagging. There seems to be boost when i'm at 70-80mph though so higher up in the rev range it feels normal. I recently had a brand new alternator & battery installed. Car has also had a full service. No fault codes, or errors. Bad batch of fuel ? are there any additives / potions I can feed the car to clean up it's insides ? I do a lot of regular in town driving and rarely go on the motorway. Car is Stage 2 with the DPF gutted by Avon Tuning in Bristol.
	Appreciate 0 Tweet Quote

06-15-2019, 07:22 AM	#2
Tambohamilton Brigadier General 3058 Rep 3,909 Posts Drives: E91 330d Join Date: Apr 2019 Location: Herefordshire iTrader: (0)	I'd suspect boost leak, or actuator issues...more likely the former, from the description you gave. I'd check all hoses and connectors attached to the inlet, between the engine and the turbo. Hopefully it's something simple like that. Good luck
	Appreciate 0 Quote

06-15-2019, 07:24 AM	#3
mjn77 Lieutenant Colonel 1073 Rep 1,956 Posts Drives: E90 M3 LCI Jerez Black Join Date: Apr 2015 Location: Herts, UK iTrader: (2) Garage List 2011 BMW M3 [0.00]	Boost leak. Check every hose and fixing.
	Appreciate 0 Quote

06-15-2019, 03:21 PM	#4
N5GKP Private 16 Rep 91 Posts Drives: E90 325i M Sport Join Date: Jul 2018 Location: Preston, Lancashire iTrader: (0)	I'd check the turbo VNT actuator linkage with the vehicle running to make sure it actually moves freely when reviving the engine up. Also check for any signs of carbon build up where the linkage actually connects to the VNT fins inside the turbo, if you can see signs of carbon blow by then that could potentially be your issue. __________________ Current: 2009 E90 325i M Sport Auto Previous: 2017 435d xDrive Gran Coupe, 2010 E90 318d SE, 2009 E90 318i SE.
	Appreciate 0 Quote