The problem car is my 2000 BMW 530i SE automatic. During a recent service, the garage said its electronic fault finder indicated a faulty electronic thermostat, which was replaced. Ever since, the car has been running very rough when cold, although it drives normally after about 15 minutes. It starts OK, but feels as if it is about to stall, although it never has. Any thoughts?
Also, can you recommend a fault reader that would be suitable for this model and would also fit my wife’s 1998 BMW 323i? WA Campbell
It sounds as though the new electronic thermostat is either not operating properly or is not connected correctly. If the initial problem shown up on the fault finder was due to a poor connection, this may be the source of the problem. Alternatively, the cooling system may not have been correctly bled, leaving you with an airlock within the new thermostat. As this problem has only developed since the new thermostat was fitted, I would return to the garage and ask them to check it for you.
A code reader that should cover both BMWS is the Foxwell NT510, although I would double-check with the company before purchasing to ensure this is the case. One of these FCR costs £169 including delivery and is available from http://bit.ly/1onkwqh