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#21
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Sent from my iPhone using Tapatalk Pro
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2005 Imola 4.8iS |
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#22
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part number for this IVM/ISM device 12527510638 for years 2003-2006, according to realoem...
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I swear, my cars are like a girlfriend. Sometimes its a rough ride, sometimes its smooth motorin'. Sometimes she doesnt like how i treat her and sometimes i dont like how she behaves. BUT at the end of the day, she loves it when I am inside her. _______________________ '91 850i '05 X5 4.4i '09 Clubman S |
#23
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12527510638
Sent from my iPhone using Tapatalk Pro
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2005 Imola 4.8iS |
#24
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In the winter, when its cold out, I've often got the shakes upon startup and then the error on dashboard... so I turn off vehicle and restart adn all is perfect... I spoke with a BMW mech about this and he said just learn to live with it as its not bad actually for the car as it warms up adn problem goes away as opposed to paying for the Lifters replacement.... he never mentioned it could be an IVM/ISM part that could be easily/cheaply replaced...interesting.
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I swear, my cars are like a girlfriend. Sometimes its a rough ride, sometimes its smooth motorin'. Sometimes she doesnt like how i treat her and sometimes i dont like how she behaves. BUT at the end of the day, she loves it when I am inside her. _______________________ '91 850i '05 X5 4.4i '09 Clubman S |
#25
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Often, a rough idle on a long sitting cold starts is due to slowly leaking injectors. The residual pressure in the fuel rail causes fuel to slowly drip into one of the cylinders. This causes a too rich condition for ignition in the effected cylinders until the extra is blown out the exhaust. Then it smooths out.
You’ll smell unburned gas frm the exhaust on startup. Diagnosis is to wait for 12 hours, or so, for the condition to set, then pull plugs and see if they are wet. Or stick a wooden pencil in the plug hole and see if it gets fuel on it.
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2005 X5 4.4i SterlingGrau, Sport Package, DSP Build 3/12/2005 |
#26
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If it's leaking injectors wouldn't it start rough from the start? Also wouldn't it be a consistent cylinder misfiring? But it's random, like today it was only cyl 6. I doubt all my injectors are leaking or I would definitely smell heavy gas which I don't. And I don't think it's technically "misfiring" more like it's slightly retarded because I I rev up slowly to like 1k rpm it doesn't misfire.
And sometimes it does start rough right away sometimes it does the normal high idle (perfectly) and as the rpm settles down (lift being adjusted by valvrtronics) the roughness begins. Again intermittently and random. Also for me shutting the car off when idling rough and restating doesn't fix it at all and so far this is always been the case. Restarting never does anything. Just have to let it go away on it's own. Have even restarted it 3 times and no chance. Sent from my iPhone using Tapatalk Pro
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2005 Imola 4.8iS |
#27
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True. It should idle rough from the start, unless it’s even dripping across all cylinders, which is unlikely.
Anytime I think about problems that show up after extended cold sitting, I think of fuel delivery. Especially since it seems to happen only after the cold of night time. Fuel starvation for some reason? That would cause lean misfire and the computer to retard ignition to reduce detonation. Failing return valve in the fuel tank that allows line pressure to drop after the pump shuts off, possibly causing short term initial starvation? Small Frozen glob of water in the fuel tank pickup? Cold causing low voltage to the fuel pump? Please keep us posted on what you find.
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2005 X5 4.4i SterlingGrau, Sport Package, DSP Build 3/12/2005 |
#28
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Yeah I looked into fuel supply issues thinking it's losing pressure the longer it sits. First the filter was replaced. Also ran fuel injector cleaners as well just as a maintenance.
To see if it was a pressure issue I primed the pump 3 times before cranking by going starting the key but not cranking on and off so the rails build up pressure but that didn't do anything either. Also monitored my voltage while this was happening to see if my alternator is failing therefore not supplying enough voltage but it all checked out, voltage goes straight up to 13.8v and does not fluctuate with the rough idle. So since I finally found about the IVM my really hoping this is it. Because every other potential issues should be happening all the time cold or not warmed up engine or not and it's not the case. Sent from my iPhone using Tapatalk Pro
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2005 Imola 4.8iS |
#29
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Welcome to the club!
Quote:
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Daily Drivers: - 2008 535i, 290,000km - 2004 X5 4.4, 01/2004 production, 380,000km - 1998 328i, 370,000km Track: - 1996 328i, track/race car, ~300,000km Winter: - 2013 Ski-Doo MXZ X 800 E-TEC, trail can - 2001 Ski-Doo MXZ 600 w/800 engine, exhaust - 1978 Ski-Doo Olympique 340 (vintage race sled) - 1977 Ski-Doo Olympique 340E |
#30
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Noooo! You just killed my hopes lol
But you're saying the replacement IVM didn't cure it but now it's not having cold start issues? So it did cure/help? Did you take apart the old IVM to see if had any corrosions or faulty soldering? Sent from my iPhone using Tapatalk Pro
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2005 Imola 4.8iS |
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