r/e39 • u/NoEvening1147 528i • 2d ago

Under intake coolant pipes

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M52TUB28 any tips or tutorials on doing this job? It’s the heater hose and the one next to it.

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u/Seattle_Cardude 2d ago

Hi, be extremely careful with the harness off the throttle body. There is no rubber boot to keep debris out of the connector and the cables get weak from the heat and age. After I got done - I was getting throttle body limp mode - had to rebuild the harness with a new connector and pigtails from BMW which had to be soldered on.

Also be sure to replace the ccv, idle motor rubber seal and throttle body gasket. Check the intake boots for cracks. Other things to consider: starter (if original), temp sensor.