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Black smoke. Drumming noise and uneven idle.Views : 526 Replies : 4Users Viewing This Thread : |
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Apr 21st, 2018, 17:18 | #1 |
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Last Online: Jun 16th, 2018 16:44
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Location: Cardiff
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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.
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Apr 21st, 2018, 17:38 | #2 |
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Last Online: Feb 10th, 2022 22:33
Join Date: Jul 2007
Location: newton abbot in sunny Devon
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Have good look at your boost hoses & intercooler for leaks.
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Apr 21st, 2018, 18:02 | #3 |
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Last Online: Apr 22nd, 2024 06:42
Join Date: Jan 2015
Location: Blackpool
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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
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Apr 22nd, 2018, 16:12 | #4 |
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Last Online: Jun 16th, 2018 16:44
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Thsnks for your replys. That gives me plenty to start checking. Many thanks
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Apr 25th, 2018, 13:52 | #5 |
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Last Online: Jun 16th, 2018 16:44
Join Date: Apr 2018
Location: Cardiff
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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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