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#1
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X5 4.6is Dies After Start Up
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#2
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Vapor lock is not something that happens on modern cars. You need to check fuel pressure to determine if fuel pump is supplying pressure.
Your gauge is high enough it's not a siphon jet thing unless also the gauge is reading high (this recently happened to me). Starts and stalls is a symptom of the IVM. (integrated voltage module).
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2011 E70 • N55 (me) 2012 E70 • N63 (wife) |
#3
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Thanks for the reply, as for the module your talking about, I don’t think mine has it, only the 04 and up models have it.
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#4
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When my car behaved like that it was the cam position sensor.
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2011 E70 • N55 (me) 2012 E70 • N63 (wife) |
#5
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Mine does this too sometimes when warm. I have to give it gas to keep it going then it levels out. Unsure if fuel filter was changed. Replaced the DMTL pump. However, mine is supercharged and prior to rebuilding the blower it was spritzing oil into the intake, not sure if the issues are related.
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740iLDUKE 01' DINAN 7 S62 Swap - Stratus Grau (1587 produced in SG 440) 02' 4.6is DINAN X5 S2 Supercharged 833/3258 produced | 1/27 Dinan X5's |
#6
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Wouldn’t that pump cause a check engine light, I’m leaning towards vacuum leak or a bad fuel pump, my fuel filter is only 8 months old so I don’t think that’s the culprit. Also when I come to a stop, my rpms decrease like the car wants to stall but when the AC is on it doesn’t do it.
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#7
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A vacuum leak with throw an error code/light.
If it's not showing a check engine light and there are no codes, then it's a physical problem like low pressure from a failing fuel pump. Mine showed the same symptom and I tracked it down to a leaking fuel hose inside the tank where it attached to the pump. Check the fuel pressure and the bleed down rate after the engine is off. It should hold pressure for a bit. https://xoutpost.com/bmw-sav-forums/...leaking-2.html
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2005 X5 4.4i SterlingGrau, Sport Package, DSP Build 3/12/2005 |
#8
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Will do, thanks for the assistance guys.
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#9
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Mine also does this after it's warmed up. It won't catch itself coming down to idle speed very well unless the AC is on, which bumps up the idle speed by about 50 rpm and it really seems to help. It feels like a vacuum leak issue to me, but i'm in the same boat where I'm not throwing any air/fuel codes, or any codes for that matter. I too will eventually test the fuel pressure.
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Black Sapphire Metallic 2002 4.6is |
#10
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Do you guys have idle control valve? Could be dirty or faulty.
Engine will run higher RPM when cold would explain why problem is only when warm. I used foxwell nt510 to set my idle up 25-50 just to make it run smoother at red lights.
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2011 E70 • N55 (me) 2012 E70 • N63 (wife) |
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