XC90: - Black smoke. Drumming noise and uneven idle.

Damianwilliams · Apr 21st, 2018, 17:18

Hi. I have a 2007 xc90 d5 185 auto. It suffers a uneven idle. And has a drumming type noise coming from the right hand side of the engine bay. It also throws out a lot of black smoke on acceleration and also some grey smoke at other times. There are no fault codes stored. The engine pulls strong. Any ideas. As I’m lost. Many thanks Damian.

harveys · Apr 21st, 2018, 17:38

Have good look at your boost hoses & intercooler for leaks.

dingov70 · Apr 21st, 2018, 18:02

D5 engines are well known for having problems with the butterfly valves in the inlet manifold . What are swirl flaps? Swirl flaps are small butterfly valves located within the inlet manifold on modern diesel and petrol engines, they are designed to help regulate the fuel to air ratio, improve emissions and help generate better torque at low engine speeds .

Broken link arm , blocked EGR , gunk in inlet manifold could all cause your problems . Black smoke is unburnt fuel & it is not hard to realise stuck butterfly's reducing / cutting off air flow into the cylinders , BUT the manifold pressure sensor tells the ECU it's on boost and increases fuel flow , resulting in black smoke .

I have used a USB endoscope that links to my android phone for looking into many manifolds & was worth te £12 it cost & saves a compost heap of time & swearwords

Damianwilliams · Apr 22nd, 2018, 16:12

Thsnks for your replys. That gives me plenty to start checking. Many thanks

Damianwilliams · Apr 25th, 2018, 13:52

I have found out what’s wrong. The swirl flap arm is missing on my car. There’s nothing coming out of the engine. Just a hole.

Apr 21st, 2018, 17:18	#1
Damianwilliams New Member Last Online: Jun 16th, 2018 16:44 Join Date: Apr 2018 Location: Cardiff	Black smoke. Drumming noise and uneven idle. Hi. I have a 2007 xc90 d5 185 auto. It suffers a uneven idle. And has a drumming type noise coming from the right hand side of the engine bay. It also throws out a lot of black smoke on acceleration and also some grey smoke at other times. There are no fault codes stored. The engine pulls strong. Any ideas. As I’m lost. Many thanks Damian.

Apr 21st, 2018, 17:38	#2
harveys Master Member Last Online: Feb 10th, 2022 22:33 Join Date: Jul 2007 Location: newton abbot in sunny Devon	Have good look at your boost hoses & intercooler for leaks. __________________

Apr 21st, 2018, 18:02	#3
dingov70 Master Member Last Online: Yesterday 06:42 Join Date: Jan 2015 Location: Blackpool	D5 engines are well known for having problems with the butterfly valves in the inlet manifold . What are swirl flaps? Swirl flaps are small butterfly valves located within the inlet manifold on modern diesel and petrol engines, they are designed to help regulate the fuel to air ratio, improve emissions and help generate better torque at low engine speeds . Broken link arm , blocked EGR , gunk in inlet manifold could all cause your problems . Black smoke is unburnt fuel & it is not hard to realise stuck butterfly's reducing / cutting off air flow into the cylinders , BUT the manifold pressure sensor tells the ECU it's on boost and increases fuel flow , resulting in black smoke . I have used a USB endoscope that links to my android phone for looking into many manifolds & was worth te £12 it cost & saves a compost heap of time & swearwords __________________ To stupidity & beyond

Apr 22nd, 2018, 16:12	#4
Damianwilliams New Member Last Online: Jun 16th, 2018 16:44 Join Date: Apr 2018 Location: Cardiff	Thsnks for your replys. That gives me plenty to start checking. Many thanks

Apr 25th, 2018, 13:52	#5
Damianwilliams New Member Last Online: Jun 16th, 2018 16:44 Join Date: Apr 2018 Location: Cardiff	I have found out what’s wrong. The swirl flap arm is missing on my car. There’s nothing coming out of the engine. Just a hole.

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