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#1
06-07-2017, 01:31 PM
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E53 4.4 keeps cutting out when coming to a standstill
My e53 4.4i keeps cutting out when i am coming to a stop It does not do it when the car is cold just when upto temp. I have scanned the car and found three faults which are as follows: 98- Tank venting valve 140 - electronic thermostat control 115- hot film air mass sensor Based on the above can anyone point out which of the faults are causing the car to cut out. Any help is appreciated
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01 e53 x5 4.4 
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#2
06-07-2017, 04:51 PM
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Unplug your MAF while running and see if it runs better or dies.
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'01 740i Sport MKIV, Quad Brake Lights, Bi-Xenon retrofit, HID Fogs Dinan 7 Struts, Springs, camber plates, Intake, MAF, CAI, Throttle Body, NBT Retrofit, Strong Strut  '99 318ti Titanium Silver; '97 318ti Boston Green; '13 X5 3.5i Saphire Black Metallic '84 633csi Black (sold); '88 325iC Black (sold); '97 740iL Black(sold); '01 740iS Black (sold);'97 318ti White (sold); '08 X5 4.8i Titanium Silver (sold); '96 318ti Alaska Blue (sold)
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#3
06-07-2017, 05:08 PM
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Hi
Cheers for the reply, i have unplugged the maf and there is no change whatsoever. I took a look at the live data and there is no reading for the maf plugged or unplugged. Furthermore i have realised that during its cold phase the car is idleing and around 750rpm But when the cutting out begins the idle speed is around 500rpm.
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01 e53 x5 4.4
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#4
06-07-2017, 08:37 PM
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Fuel filter?
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2003 4.6is built June 27th, 2003 2004 4.8is built June 6th, 2004
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#5
06-07-2017, 10:08 PM
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Good day!!
For the easy checks, make sure you have your fuel cap in place... If you have the means to swap with another, I'd do that... That might get rid of your tank venting valve fault... I agree with 740iS about the MAFS... Sometimes you can get an indication of them going bad if you tap on the top while the vehicle is running... If the engine idles differently during that abrupt thump, it is going bad... However, not getting readings while plugged in kinda says it might be the cause... I forgot to plug mine back in once a while back and I got the same symptoms... Mine never really died, but it really wanted to a few times... You have a good used one you can swap it out with to verify? Good luck!! Cheers!!
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2001 E53 X5 4.4i (03-07-2001 build date) White exterior / hellbeige interior (6MT swap vehicle - Manny) 2002 E53 X5 4.6is (12-20-2001 build date) Imola Red exterior / M-texture interior (Red) 2003 E53 X5 4.4i (06-26-2003 build date) Silver exterior / Black interior (Silvester II) 2008 Mini Cooper S ragtop (04-17-2008 build date) Dark Silver exterior / Gray interior ( Topless) BMWCCA member (#4745)
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#6
06-08-2017, 01:59 AM
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The MAF would have to be suspect. When you disconnect it? It should revert the engine to a default MAP. So you should notice a difference in engine running/revs/speed/idle etc.
If you do not notice any difference? It is "possible/probable" that the MAF had died and your engine is permanently now running on the defaulted MAP. To test this you, will need to put in a new or known good MAF.
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#7
06-08-2017, 09:15 AM
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Quote:
Most don't realize that the MAF is a consumable part and they do wear out and need periodic replacement. Just like the O2 sensors, they last between 75k and 100k miles on average.
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'01 740i Sport MKIV, Quad Brake Lights, Bi-Xenon retrofit, HID Fogs Dinan 7 Struts, Springs, camber plates, Intake, MAF, CAI, Throttle Body, NBT Retrofit, Strong Strut '99 318ti Titanium Silver; '97 318ti Boston Green; '13 X5 3.5i Saphire Black Metallic '84 633csi Black (sold); '88 325iC Black (sold); '97 740iL Black(sold); '01 740iS Black (sold);'97 318ti White (sold); '08 X5 4.8i Titanium Silver (sold); '96 318ti Alaska Blue (sold)
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#9
06-10-2017, 08:33 PM
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Before throwing parts at it did you try to read some live data? Do you know how many G/S is flowing through the MAF? Sounds like the idle may be too low when it comes to a stop. Could be a vacuum leak, since when the throttle plate is closed, the vacuum is the greatest.
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2006 Infiniti G35 2001 BMW 3.0I E53 X5 Build date 08/2000 SOLD Lotus Europa 1970 Destroyed by fire Lotus Europa 1970 S2 Renault Powered Lotus Type 52 1970 Twincam Webers Powered PORSCHE 911 Targa 1982 The Garage Queen Audi Avant donated to Kars for Kids BMW 525IT Sold Audi 4000CS Quattro Sold Jensen Healey Lotus Powered Sold Opel 1900 Sold Triumph Spitfire 1971 Sold Triumph Spitfire 1968 Sold Plymouth "Cuda" 340 Six pack SOLD
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#10
09-11-2017, 05:51 AM
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Sorry for the late reply guys. This problem is still ongoing. I have replaced the maf with a new genuine one and now the error code has gone and live data is with in range but it is still cutting out.
The other error for the thermostat is still there but cant imagine that causing the car to cut out. Any ideas guys
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01 e53 x5 4.4
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