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BMW E83 2.0D (150HP) Cold Start Issue: Shuts Off Multiple Times, Fuel Pressure & Pump Query

sly_1978 18249 16
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Why does a BMW E83 2.0d cold start, run for 2–3 seconds, then stall several times before finally running normally, and what fuel pump pressure should it have?

For this common-rail diesel, 0.8 bar at the in-tank pump is too low; the pre-pump pressure should be around 3.5 bar. [#17065172] The filter area on this car is a heater, not a second pump, so the fuel supply should be checked against the CR system requirement rather than assuming a missing auxiliary pump. [#17063473][#17064053][#17065172] Since glow plugs and the glow plug driver were already checked, a real-world fix for the same cold-stall symptom was a faulty EWS 3+ module and two relays: the fuel-pump supply relay behind the glove box and the ECU power relay in the engine bay. [#17064636][#19207029] In that case, replacing the EWS module and relays eliminated the problem even though diagnostics showed no faults. [#19207029]
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  • #1 17060657
    sly_1978
    Level 20  
    Posts: 724
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    Hello.
    BMW E83 2.0d 150HP will start and go off in the cold two or three times in the cold. Then it will start and work properly. Warm burns at touch. Interestingly, when smoking cold, turning twice three times for ignition helps. Looks like fuel reversing. The question is what pressure should the pump generate in the tank, because it gives about 0.8 Bar. Unfortunately, "ours" have already been here and I can not see the parameters or errors.
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  • #2 17061029
    piotrekwoj1
    Level 43  
    Posts: 10332
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    sly_1978 wrote:
    Unfortunately, "ours" have already been here and I can not see the parameters or errors.

    And why is that?
  • #3 17061086
    sly_1978
    Level 20  
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    piotrekwoj1 wrote:
    sly_1978 wrote:
    Unfortunately, "ours" have already been here and I can not see the parameters or errors.

    And why is that?


    Someone pushed toe to DPF.
  • #4 17061210
    piotrekwoj1
    Level 43  
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    So it's best to restore the error table.
  • #5 17063286
    Cobrat
    Level 22  
    Posts: 428
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    sly_1978 wrote:
    Hello.
    The question is what pressure should the pump generate in the tank, because it gives about 0.8 Bar.


    For CR, this is not enough ... There is no second (threshold) pump?
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  • #6 17063473
    sly_1978
    Level 20  
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    Cobrat wrote:
    sly_1978 wrote:
    Hello.
    The question is what pressure should the pump generate in the tank, because it gives about 0.8 Bar.


    For CR, this is not enough ... There is no second (threshold) pump?


    This engine has no other pump.
  • #7 17063894
    xxxkubek
    Level 10  
    Posts: 47
    Rate: 21
    You have one pump in the tank, the other at the height of the driver's seat, under the floor of course (unless it was different in m47?)
    And stupid question, the fuel filter when changed?
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  • #8 17063974
    sly_1978
    Level 20  
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    xxxkubek wrote:
    You have one pump in the tank, the other at the height of the driver's seat, under the floor of course (unless it was different in m47?)
    And stupid question, the fuel filter when changed?


    The second pump is not there. Filter by customer relationships exchanged, but to be sure, I'll look at him tomorrow. I am interested in the pressure of the pump, if it is not enough. I can't find anywhere.
  • #9 17064017
    xxxkubek
    Level 10  
    Posts: 47
    Rate: 21
    No pump at the fuel filter? I check after pictures and the filterek is together with the pump
    Call the service tomorrow (regenerating pump injection, etc.) give up for the customer that you want to give the car back and ask for pressure, they usually prompt because they count on the customer
  • #10 17064053
    sly_1978
    Level 20  
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    xxxkubek wrote:
    No pump at the fuel filter? I check after pictures and the filterek is together with the pump
    Call the service tomorrow (regenerating pump injection, etc.) give up for the customer that you want to give the car back and ask for pressure, they usually prompt because they count on the customer


    At the filter it is a heater. I don't think they have info regarding this.
  • #11 17064181
    xxxkubek
    Level 10  
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    Then check if you stick the cake during the first cold start to the inlet, it will also go out, if it does not go off, it will be known that the problem lies in the fuel supply.
  • #12 17064456
    sly_1978
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    xxxkubek wrote:
    Then check if you stick the cake during the first cold start to the inlet, it will also go out, if it does not go off, it will be known that the problem lies in the fuel supply.


    After all, I wrote that turning to ignition helps several times.
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  • #13 17064518
    xxxkubek
    Level 10  
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    And what does that have to do with it? There is no certainty with the problem is the lack of fuel
    In Bmw, the problem is often made by the glow plug driver, there may also be a problem, it's a pity that it doesn't connect to the computer, because the error would pop up right away
  • #14 17064636
    sly_1978
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    xxxkubek wrote:
    And what does that have to do with it? There is no certainty with the problem is the lack of fuel
    In Bmw, the problem is often made by the glow plug driver, there may also be a problem, it's a pity that it doesn't connect to the computer, because the error would pop up right away


    The driver and candles checked first.
  • #15 17065172
    Cobrat
    Level 22  
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    @ sly_1978 For the CR system, I think the pre-pump pressure is 3.5 bar. 0.8 is for the VP pump, but I can be wrong, I don't do it every day ;) . If I'm wrong, somebody correct me, but 0.8 bar is not enough for this system.
  • #16 19207029
    marcin.dziubczyk
    Level 1  
    Posts: 1
    Rate: 3
    Hello. Maybe someone will find it useful to have information related to my problem in X3. (Engine 2.0d M47) -2005 r Many users of the e83 model with a diesel engine have a problem with starting the engine, for example after a night stop, when we start the cold engine in the morning, it ignites but after 2-3 seconds it goes out. this problem. In my X3 the problem was a damaged EWS 3+ module (BMW number 61 35 6 941 986) it was replaced with another newer generation EWS 4 (BMW number 61 35 9 127 086) Electronic diagnosis did not detect any error. Apparently everything was working. Additionally, two more relays were replaced. One located behind the glove box in a bright green color, responsible for controlling the fuel pump power supply. It is marked K96 / X10156 on the diagram. It has been replaced with a brand new one. (Relay No. BMW 61.36 837700) and the second relay responsible for powering the engine control unit. It is located under the hood in the engine compartment on the left side (driver's side). In the diagram it has the designation K2003a / X2085. Relay is blue. New relay number (BMW number 61.36 6 915 327) Since the EWS module and relays have been replaced, the problem has not existed. In addition, 4 glow plugs and the glow plug relay / driver have been replaced. snapping vortex flaps they have been removed from the suction manifold.
  • #17 20535936
    tequila1993
    Level 1  
    Posts: 1
    >>17060657
    Hello, I have the same problem, can you tell me what the reason was? Thanks in advance.
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Topic summary

✨ The discussion revolves around a cold start issue with a BMW E83 2.0D (150HP) where the engine starts but shuts off multiple times in cold conditions. Users suggest checking the fuel pump pressure, which is reported to be around 0.8 Bar, potentially insufficient for the common rail (CR) system that typically requires around 3.5 Bar. The absence of a second pump is confirmed, and the fuel filter's condition is questioned. Other potential causes include issues with the glow plug driver and the EWS module, which has been known to cause similar problems in other BMW models. Recommendations include checking the fuel supply and relays associated with the fuel pump and engine control unit.
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FAQ

TL;DR: Typical M47 pre-supply is about 3.5 bar; “0.8 bar is not enough.” If your E83 2.0d stalls on cold start, verify low-pressure fuel delivery first. [Elektroda, Cobrat, post #17065172]

Why it matters: This FAQ helps BMW E83 2.0d owners fix cold-start stalls faster and avoid misdiagnosis.

Quick Facts

What fuel pressure should the in-tank pump provide on a BMW E83 2.0d?

Typical common-rail pre-supply is around 3.5 bar. 0.8 bar is too low for this system. “0.8 bar is not enough for this system.” Measure at the feed line with a gauge. If pressure is low, test the lift pump and its power supply before chasing injectors. [Elektroda, Cobrat, post #17065172]

My X3 starts, runs 2–3 seconds, then dies when cold. What fixed it for others?

One owner solved this by replacing a faulty EWS 3+ with EWS 4 and renewing two relays: K96 (fuel pump) and K2003a (ECU power). The car had no codes and would die after 2–3 seconds. After these parts, cold starts were reliable again. [Elektroda, marcin.dziubczyk, post #19207029]

Why does cycling the ignition two or three times help a cold start?

Cycling the ignition primes the low-pressure circuit. The OP reported that turning to ignition two or three times helps cold starts. He suspected fuel reversing, which points to supply-side issues like drain-back or a weak lift pump. [Elektroda, sly_1978, post #17060657]

Does the M47 in the E83 have a second low-pressure pump?

One contributor reports a second pump under the car near the driver’s seat. It sits roughly below the seat, along the fuel lines. Inspect your specific car for this configuration. If present, test that auxiliary pump as part of your diagnosis. [Elektroda, xxxkubek, post #17063894]

Where are relays K96 and K2003a, and what do they do?

K96 is a bright green relay behind the glovebox powering the fuel pump. K2003a is a blue relay in the left engine bay powering the ECU. Replacing both resolved cold-start stalls for one owner. [Elektroda, marcin.dziubczyk, post #19207029]

Could the glow plug controller cause hard cold starts on this engine?

Yes. A failing glow plug driver can cause difficult cold starts on BMW diesels. A contributor flagged this as a frequent culprit. Scan the glow system and verify the controller and plugs before deeper fuel work. [Elektroda, xxxkubek, post #17064518]

I can’t see fault codes or parameters. What should I do first?

Restore the ECU’s error table to regain diagnostics. A user recommended this step when codes and live data were missing after changes. “So it’s best to restore the error table.” [Elektroda, piotrekwoj1, post #17061210]

Could previous DPF modifications block diagnostics?

Yes. The OP indicated a DPF modification had been done, and afterward he could not see parameters or errors. Revert such changes or reflash to stock to restore diagnostic visibility. [Elektroda, sly_1978, post #17061086]

How do I prime the fuel system before a cold start?

Use the ignition-cycling method the OP found helpful:
  1. Switch ignition ON for 10–15 seconds without cranking.
  2. Switch OFF and repeat 2–3 times.
  3. Start the engine and observe idle stability. [Elektroda, sly_1978, post #17060657]

Is a 0.8 bar low-pressure reading acceptable on this common-rail system?

No. The system expects around 3.5 bar pre-supply. “0.8 bar is not enough.” At 0.8 bar, expect cold stalls and poor priming. Investigate the lift pump, filter restriction, and wiring for faults. [Elektroda, Cobrat, post #17065172]

What’s at the fuel filter on the E83 2.0d—pump or heater?

On the OP’s car, the unit at the fuel filter location is a heater, not a pump. Verify your vehicle’s configuration visually before ordering components. [Elektroda, sly_1978, post #17064053]

Should I replace the fuel filter during diagnosis?

Yes. Confirm the fuel filter service history and replace it if unknown. A contributor raised this check early because restriction there starves the low-pressure side and worsens cold starts. [Elektroda, xxxkubek, post #17063894]

Warm starts are perfect. Does that rule out fuel supply problems?

No. In the thread, warm starts were instant yet cold starts stalled. Ignition cycling helped, which points to priming or supply issues. Do not rule out low pre-supply pressure or air ingress. [Elektroda, sly_1978, post #17060657]

I have the same issue—what’s the most likely fix from this thread?

The only confirmed resolution shared was replacing a failed EWS module and renewing relays K96 and K2003a. After that, the engine started reliably from cold. Use this path after verifying pre-supply pressure. [Elektroda, marcin.dziubczyk, post #19207029]
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