2006 BMW X5 3.0I AC Condenser and Aux Fan Cause Overheating

[upallnight]

Get yourself a scanner and do some of these work yourself or you are going to regret the day you brought that BM Trouble U.

A misfire will turn on the light after x number of misfires had occurred in the cylinder. Turning off the engine just reset the counter for the misfire and the light will go off until the number of misfires has ocurred again.

If you are an Android person and didn't drink the Apple Cider, you can down load a free app Torque.

[crystalworks]

Or you can purchase Carly BMW which I've used with good results. It's $55 I think but was worth it for me. Torque is a good option as well.

[Nick416]

I am an android user. The last time the light came on there was a code for misfire low fuel (I believe that's what it said) but it has never ran with low fuel. Could that mean something? Also what would cause a misfire if that's what it is? I'll look into Carly BMW. THANK YOU!

[upallnight]

Any time the computer see a variation in speed after a cylinder fires, it count that as a misfire. The computer keeps track of all the misfires in each cylinder and when the misfires exceed a certain limit it throws up an SES light.

A misfire could be from a bad spark plug to low compression in a cylinder to a burnt valve, to a clogged injector or a dead injector.

[Nick416]

Thank you upallnight. How can I narrow the problem down?

[Nick416]

I think the mechanic mentioned one of the codes meant there was a compression issue. This was about 2 weeks ago. He reset the light and said it was a misfire probably due to running with low fuel. I know it never ran with low fuel though. There is no lack of power and I've never heard a misfire.

[upallnight]

Originally Posted by Nick416

I think the mechanic mentioned one of the codes meant there was a compression issue. This was about 2 weeks ago. He reset the light and said it was a misfire probably due to running with low fuel. I know it never ran with low fuel though. There is no lack of power and I've never heard a misfire.

You are thinking of a typical old misfire situation when the cylinder is actually dead. In these computer controlled engine, the computer is able to detect the slightest variation in the power from each cylinder. The cylinder may not be dead, but it is weaker than the rest of the cylinders. The computer consider this a misfire.

[Bmwtvboy]

Have you run an ac pressure check ? If there is insufficient coolant pressure than changing the aux fan won't fix anything. If the compressor is damaged changing the fan won't fix it. Is this shop specialized in AC repair? I changed out my pusher fan for less than 200 drove from FL to ME 4 months ago and everything was perfect. However, because the fan wasn't working properly the temp in the system rose and released refrigerant. My shop evap and filled the system and then I changed the fan.
DON"T spend a dime until you know for sure if your compressor is good.