BMW 740i Repair and Maintenance

A guide to problems, costs, maintenance and repair for your BMW 740i

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BMW 740i Problems

Check Engine Light with Code P30FF and Rattle from Engine

The BMW 7 series turbo engine suffers from waste gate issues which become progressively worse with normal driving and especially with harsh driving conditions.

The turbocharger uses exhaust gas to create air pressure which is then forced into the engine. When there is no demand for power, the exhaust gases are released into the exhaust through a waste gate to prevent the turbo from speeding up.

“Waste gate rattle” or “Turbo rattle” is a result of excessive movement between the waste gate and the waste gate seat. This is a progressive issue with the following symptoms:

  • Rattling at cold start
  • Rattling upon deceleration
  • Loss of power
  • Check Engine Light Illumination
  • Manufacturer Specific OBD trouble code P30FF
  • Very poor engine performance and MPG

Adjustment of the waste gate actuator can solve the issue, but the issue will return. If adjustment does not correct the issue, the turbocharger waste gate must be rebuilt with new bushings, or the turbocharger must be replaced. BMW has replaced many turbocharger assemblies under warranty to correct this issue.

Multiple Parts May be Recommended to Correct Coolant Loss

Leaks are known to develop in the cooling system. It is common to see more than one part recommended for repair/replacement due to overlapping labor and the use of many plastic parts in the system.

Loss of Power Steering Fluid Due to Leaking Hoses

A fluid leak may develop from one or more power steering hose. When a leak is being repaired, it is not uncommon for multiple hoses to be replaced.

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BMW 740i Questions

Engine misfiring on Bank 1 possibly due to timing problem. Could be timing guild (1 answer)

Replaced 20+ items on engine and it still runs rough as though it wants to stall out, it has left me stranded a couple times. The most likely problem is the timing chain rail is broken and maybe the tensioner and/or the gear and or vanos timing. Need to remove front of engine and replace problem...

What is my best option if I need to replace the alternator in my 2000 name 740i? (2 answers)

The car has 223,000 miles on it and I have already replaced battery, water pump, and fuel pump.

what would happen if a person disconnected the battery with out a power saver? (1 answer)

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BMW 740i Recalls

The Auxiliary Water Pump May Smolder and/or Catch Fire

On vehicles equipped with an 8 or 12 cylinder turbocharged engine, the circuit board for the electric water pump may overheat. This could lead to smoldering of the pump and/or an electrical fire in the engine compartment. Dealers will replace the auxiliary water pump to correct this concern.

Recall 01V206000
VEHICLE DESCRIPTION: PASSENGER VEHICLES. THE ENGINE AUXILIARY/COOLING FAN OPERATION, INCLUDING VARIABLE SPEED, IS ELECTRONICALLY CONTROLLED. FAILURE OF THE FAN MOTOR CAN CAUSE THE ELECTRICAL CIRCUITRY OF THE FAN CONTROL UNIT TO OVERLOAD AND FAIL, CAUSING THE FAN TO STOP OPERATING.
Recall 01V001000
VEHICLE DESCRIPTION: PASSENGER VEHICLES EQUIPPED WITH 18-INCH TIRES. (18-INCH TIRES ARE STANDARD EQUIPMENT ON THE M5 AND OPTIONAL EQUIPMENT ON THE 7-SERIES MODELS). THE MACHINE USED TO MOUNT AND INFLATE THE TIRES ON THE WHEELS AT THE ASSEMBLY PLANT MAY HAVE DAMAGED THE SIDEWALL OF ONE OR MORE ...

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BMW 740i Reviews

Picked this dream car up with 39,000 orign. miles like new in and out. Had a brake job done 6 months ago. Now when parked over night when you back up you hear a very loud noise when you first applie the brakes. the nosie Can be heared inside the house. The brakes work fine. Is it the park brake ?/ Cable, Shoes ?
I purchased my 1998 740i in 2005 with 69K. I was hesitant about buying a car online. I had to fly 900 miles to pick up the car. That 900 mile drive back home convinced me that BMW is the “Ultimate Driving Machine.” At one point I was driving and bonding with the car, then I looked at the speedometer and I was going 105 mph. (That’s how we roll in Texas). I couldn’t believe that I was driving ...
My alarm will come on while i am driving and don't know what to do In need of any kind of help

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