Idles rough possible vacuum leak

Tiny
GEJULES
  • MEMBER
  • 2006 BMW X5
  • 3.0L
  • V6
  • 4WD
  • AUTOMATIC
  • 177,000 MILES
How do you go about locating a vacuum leak on an e53? I have already changed the Disa valve, intake manifold gasket and the CCV valve. The vanos solenoids where checked and they are okay. What could be causing the SUV to idle rough and the leak vacuum leak code to stay on? Thanks
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Thursday, June 27th, 2019 AT 5:40 AM

3 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
Welcome to 2CarPros.

A vacuum leak can come from just about anywhere. Here is a link that explains how to locate a leak. Take a look through it and let me know if it helps. Also, let me know what code you are getting.

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

I hope that helps. Let me know.

Joe
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Thursday, June 27th, 2019 AT 8:34 PM
Tiny
GEJULES
  • MEMBER
Good day:
Thanks for your response to my question. I already checked the stuff that you provided in the link that you sent me. However, the leak is still present. The code that I have is P0174.
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Saturday, June 29th, 2019 AT 5:06 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Welcome back:

The code indicates a lean condition. See picture 1. Since it is exceeding Lambda, either you have really low fuel pressure or a major vacuum leak. Have you checked fuel pressure? And you are certain there are no vacuum leaks?

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Here are the directions for testing fuel pressure specific to your vehicle:

13 31 029 CHECKING FUEL PUMP DELIVERY PRESSURE
Checking Fuel Pump Delivery Pressure (M54)

Special tools required:
- 13 3 010
- 13 5 220
- 61 3 050

Switch off ignition.

CAUTION:
The fuel in the fuel lines is under pressure (approx. 3 bar).
Catch and dispose of escaping fuel.

Remove cover from fuel injectors.

pic 1

Remove dust cap (1) from measuring valve on fuel rail.

pic 2

Prepare special took kit 13 5 220 (consisting of 13 5 221 and 13 5 222).

pic 3

Unscrew check valve (1) on special tool kit 13 5 220.
Fit special tool kit 13 5 220 on measuring valve and tighten knurled nut until hand-tight.
Start engine.
Screw in check valve (1) until a pressure reading is indicated on DIS Tester.

CAUTION: Do not under any circumstances screw in the check valve up to the mechanical stop. This could damage the valve in the pressure regulator housing.

Measuring fuel pressure:
- Connect pressure sensor to DIS Tester
- Start engine.
- Select Measurement.
- Multimeter function appears
- Select Pressure test
- Read off fuel pressure

Compare actual value of test pressure with specified value.
Switch off engine.

Checking fuel pump:
Detach fuel pump relay.

NOTE: Check whether fuel pump no longer starts up during engine starting procedure (engine fails to start).

pic 4

Connect special tool 61 3 050 to terminal (87) and terminal (30).
Press button and read off fuel pump delivery pressure on DIS Tester.
Compare actual value with specified value of delivery pressure.

pic 5

Keep special tool 13 3 010 ready for further tests.
Further tests are described in the section "Fuel pressure check".

NOTE:
Interrogate fault memory of DME control unit.
Check stored fault messages.
Rectify faults.
Then clear fault memory.

_____________________________

Let me know if I can help.

Joe
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Saturday, June 29th, 2019 AT 6:15 PM

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