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#1
04-07-2022, 05:31 PM
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Stumble from stop light under mid to heavy throttle
2001 X5 3.0 from a start, stumbles like it is not getting power, from stop only. More so when fully warmed up.
Changed intake cam sensor. Exhaust was done about 30k ago. DISA checked and fine. Idle control valve was cleaned about 20k ago. Could be:
No codes. 260k miles I do need to replace my drivers side Fuel Tank Sending Unit as after a fill up the fuel level did not come back. It came back after a week full of gas though.
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Kevin 2001 X5 3.0i Phoenix, AZ 
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#2
04-07-2022, 07:05 PM
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How old is the fuel pump? Feels like fuel pump
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2011 E70 N55 (me) 2012 E70 N63 (wife)
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#7
04-07-2022, 07:42 PM
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The float for level doesn't interfere with fuel delivery, however if you don't know how much fuel, add enough to know you have 1/2 tank and test.
Siphon jet problems occur close to 1/3 to 1/4 tank and could cause a delivery problem but usually it isn't power problems it's fuel starvation stall. When fuel pump is near end of life, the FPR will hide a weak pump and symptoms show up under moderate to heavy demand.
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2011 E70 N55 (me) 2012 E70 N63 (wife)
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#8
04-07-2022, 07:50 PM
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i have 1/3 tank, only and issue from stop and med to hard acceleration for about 2 seconds until it gets going. RPM / Torque related I am thinking.
throttle position sensor exhaust cam sensor crankshaft sensor oxygen sensors smoke test? Fuel Tank Sending Unit Fuel pump wheel speed sensor clean maf
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Kevin 2001 X5 3.0i Phoenix, AZ
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#9
04-07-2022, 08:25 PM
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Tested in neutral, misses when tapping throttle, goes away on after a second . No cel. Original coils. Bad spark plug? Only 23k on plugs. MAF or TPS is my guess. I have Autel MaxiDiag MD808 Pro perhaps I can run live data
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Kevin 2001 X5 3.0i Phoenix, AZ
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#10
04-07-2022, 09:21 PM
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Stumble from stop light under mid to heavy throttle
Track real time TPS values can your scanner graph? Also pedal sensors.
Then: fuel pressure while hitting throttle. It should be dead flat no waver.
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2011 E70 N55 (me) 2012 E70 N63 (wife) Last edited by andrewwynn; 04-07-2022 at 10:30 PM.
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