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#1
07-19-2014, 11:33 PM
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Engine doesn't idle properly
Hopefully someone can help. I have a 4.4 N62 V8 which I just replaced the coolant transfer pipe,valley pan, intake manifold. Now it idles strangely, it't not rough and it's not missing it's just got a very small vibration - you know when you move your car from neutral to gear and it drops a little, mine is always like that...
It idles around 550rpm and sounds/feels like it has a load on it. I'm thinking that the coolant issue is unrelated but thought I would put it in just incase.
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2004 E53 4.4L N62 
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#3
07-20-2014, 04:32 AM
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I'd also wonder if there is a vacuum leak (something unplugged or not seated correctly) or a sensor not plugged in. Did you plug your car into a Peak tool, INPA, GT1 or similar to read your codes? The car IS working to tell you something - you just need to find a way to speak it's language
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2002 Euro X5 (E53) 3.0 diesel (M57) 5 speed manual with UUC short shifter. Pre-xDrive NV125 transfer case (chain & gears). Factory Xenon headlights, Spyder LED tail lights Updated vortex crankcase breather. Motorsport dead pedal, factory fire extinguisher, factory first aid kit, factory F&R mud flaps, factory PDC Bilstein B6 shocks F&R Redline oil has replaced "lifetime" fluids (F&R diff, manual transmission, transfer case and P/S). Dimple magnetic drain plugs in all compartments.
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#4
07-20-2014, 08:53 PM
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It could be a vacuum issue - everything is plugged back in - I'm a bit OCD with that. Maybe dust got into the MAF or I damaged it when I removed the intake components and placed them on the ground? I disconnected the MAF while the engine was running and after it's initial spurt sounded like it idled better (normal) so I'm leaning towards that. I don't have the money to replace it so I'm hoping that it is just dirty but will keep trouble shooting...
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2004 E53 4.4L N62
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#5
07-21-2014, 02:44 PM
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If you didn't have the issue before the work you did, it is most likely this issue is connected and likely a vacuum leak as suggested. Before I would do something like a smoke test or replacing anything, I would try spraying carb cleaner or starter fluid where a vacuum leak may be. If there is a vacuum leak you should hear the idle increase somewhat. The MAF is easy to clean, be sure to use MAF cleaner.
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 X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interiorDallas
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#6
07-21-2014, 10:14 PM
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Quote:
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2006 X5 4.4i premium, Sport package ,Winter Package, Sat Nav. AFE Power stage II Production : 08-2006 2012 BMW 128I Convertible Black 2011 Mercedes Benz B200 sold 
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#7
07-22-2014, 07:39 AM
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I'm struggling to work out where a vacuum leak could come from, anything in particular I should be looking for? I didn't really disconnect any vacuum sources so any help with trouble shooting would be very much appreciated...
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2004 E53 4.4L N62
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#8
07-22-2014, 08:12 AM
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Quote:
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#9
07-22-2014, 08:10 AM
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All around intake manifold, usually. Even places not anywhere near where you were working can be affected from pulling on that and tugging on this. Old brittle lines are easy to crack and it's hard to see.
I'm not familiar with your engine so pardon the lack of specifics. I recently tracked down a Leak to the drivers side rear wheel well which I thought had something to do with cleaning MI idle control valve..... It was just coincidental on the timing and not really related. Good luck with the search...... If you have any hair to pull out you may need to. Sent from my SCH-I545 using Tapatalk
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