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Robert, BMW Technician
Category: BMW
Satisfied Customers: 4708
Experience:  Fully qualified 19+yrs exp/self employed technician in the UK
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I have a 2000 318i tourer on a long journey of 300 miles plus

Customer Question

i have a 2000 318i tourer on a long journey of 300 miles plus the pressure hose assy part no *********** on the emissions control air pump melts on the conecton i have replaced this hose twice now any idea what it could be
Submitted: 2 years ago.
Category: BMW
Expert:  Robert replied 2 years ago.


Do you have the last 7 digits of your VIN number?

Is this the quick release hose section between the pump and the valve on the cylinder head?

Customer: replied 2 years ago.

The VIN number is *****

yes to your question

Expert:  Robert replied 2 years ago.

Hi..there.thanks for that..

Ok.. it possible the reason for that pipe to melt as a such is maybe due to that valve - its ment to apply air through the exhaust manifold to help with emissions etc.if the valve has some how stuck open and not closing .then it could be getting,reciving exhaust gases upto it and thus the heat from that is maybe causing the pipe connection to it to melt..thats about the only thing id say thats causing that pipe to melt like it does..the valve itself is vacuum controlled - so basically inspect that small hose for cracks/splits..its vital that you do check that vacuum line - because if its loosing vacuum then it simply wont work properly - then follow the line until you come to the electronic control valve and the rest of circuit that leads to the inlet manifold as thats where i remember its gets it vacuum supply from..the electronic valave just controls the supply of vacuum to open and close that it possible either the valves at fault or that small electronic controller is faulty if the lines are can remove the valve and with a mityvac check it works if not then its no doubt faulty..or you can remove it and check it does and clean it out ifs really coated in soot..might be preventing it from operating properly..brake cleaner/carb cleaner can help clear it out...I do hope this helps