My ASC light in my 1997 Z3 turns itself on and at the sametime the car miss fires & performs really badly. Auto electricians seem stumped! The car is in for a full service in a few days - I have even had comment this could becaused by spark plugs? I cannot tell if the light is coming on because of the miss firing, or the opposite - kind of a chicken/egg situation. Had it scanned yesterday and was told thee was numerous faults, all seemingly linked. Any advice? Cheers! :)

If it got too hot the engine may have been damaged. You will need to have a cylinder compression test to make sure the engine is ok. Did the coolant get all over the engine? Some electrical connections may have gotten wet. Make sure it is getting fuel. Spray a little starter fluid into the throttle body.

Check on Bimmerfest,com its a bmw forum, I have gotten alot of great answers and ideas for my 1997 z-3 roadster great site.

check for fire, fuel, did you take out distributor or turn it? if no fire check coil, timing belt, wire, etc.....

as you've had the OBD scanned i'd go with getting the codes erased, after noting down what they were, and see if problem persists, if does then change whatever the codes indicate

If you have an automatic transmission, you may have two exclamation points in warning lights on the dash. The one in the circle with gear cogs around its perimeter is an error warning light for the computer in the automatic transmission. I have never had that light, but I would first disconnect the battery to try to clear it, and if that failed, I would have to take the car to a good independent shop that specializes in BMWs. Go to Car Talk website for recommendations for a shop.
The exclamation point in a triangle which in turn is in a circle, located between the speedometer and tach, is for the Automatic Stability Control. It should illuminate when you press the ASC button on the console which turns the ASC off. The light warns you when the ASC is turned off.
If there is a problem with the ASC, the most common problems are: 1) Failed switch in the console. 2) Damage or foreign objects in the wheel speed sensors. There are tooth wheels near the front brake rotors and on the rear axle. There are sensors near the toothed wheels that detect wheel speed. The the sensors must be the correct distance from the toothed wheel. If their wires are chaffed, or the toothed wheel is bent or broken, they won't work. 3) Poor connections on the ASC electrical connectors under the hood. Look on the ASC (outboard) throttle body and on the brake controller module. 4) I once put on a new throttle body rubber boot, and I left the screw on the hose clamp positioned at 12 o-clock, up on top of the boot. The ASC throttle arm collided with the hose clamp screw so the throttle motion was restricted. That set an ASC error code and illuminated the light.

Anythings possible with a 10 year old car. Could be a fuel pump or ignition issue. We have tools to test for this situation. Without testing were all just guessing. Would you really throw a $500 dollar part on the car without accurately testing because someone said too. This really needs to be brought to a repair shop.

Check to see if your brake pads and rotors are in good condition. Or if you have replaced the pads yourself and have not reset the wheel sensors this would cause the ABS Antilock Brake System light and the ASC Automatic Stability Control light to stay on as the ASC uses the ABS brakes with computer assistance to control the traction of the car if not fixed it can effect your rev limiter slowing performance

There must be a problem with the air bag system for the light to be on, if the system was o.k. the light would be off and have a stored code. You cannot reset this light with a generic obd2 scanner. You need to access the air bag system and read what codes it has stored. Good Luck.

When your ASC light is on this is to let you know your Automatic Stability Control system is switched off press the ASC button Till light is off /ASC is on this works with your rev limiter and should stabilized your idle. If the problem persists have your throttle control unit checked as thi can trigger the ASC light as well and may also activate the ABS light if not fixed

I have a replacement roof for my 1997 BMW Z3, could anyone give me advice how easy or hard its and could one man do it on his own?