M70 / M73 / M73TU Family

BMW M73
BMW M73B54 – photo by The Car Spy

BMW M70 / M73 / M73TU Family

All Engines

Problems

  • Distributor caps and rotor arms should be checked at 80k miles – if they’re worn, the engine will be down on power and get poor fuel economy
  • Rubber couplers between the intake manifolds and heads can spring vacuum leaks and it’s a big job to replace them
  • Oil spray bar banjo bolts can slacken and cause problems
  • Throttle stepper motors can cause EML faults

Not Problems

  • Early vehicles: Oil can leak from the upper timing cover – this is not a concern

M70

Usage

M73 / M73TU

Usage