BMW Repair: car misfire and dont idal good, coolant temperature sensor, throttle position sensor

Question
i have a 1988 bmw  735il  that mis fires i have changed the rotor button gas filter and it still doing the same thing.the warmer it get the worst it run then it starts to cut off but it will start right back.but it run rought;is there any way to check the  thorter persition sensor and the temperature at homeor what else could be wrong with ithope you can help0 meis there any way to run a scan on the on board computer          neepd help bad think.          ps where is the temperature sensor located?          think you very much

Answer
Subject:    car misfire and dont idal good
Question:    i have a 1988 bmw 735il when you get on it it seem like misfire i have changed the rotor button but that didnt help all of the spark plugs wires look good cant seem to fine the problem there is no check engin light on or no kind of light please help me if you can.          think you
Answer:    Think i will....
It's hard to guess without running an ignition scope and an exaust gas analizer I would check the throttle position sensor; coolant temperature sensor-unless the car acts like this when you first start it up and drive.
Have you changed your fuel filters recently? if not this will most likely be the cause, it could also be other regular maintence items like the air filter.
Check your fuel pressure at the fuel rail.
check the timing w/ a timing light (flip the throttle open a few times to see if the automatic timing is functioning)
sounds more to me like a fuel starvation problem caused by insufficent fuel supply at the engine (since hard acceleration requires more fuel)
-cheers



the coolant temperature sensor is on the thermostat houseing you can check the throttle position sensor with a voltmeter.  What you really need is to put it on an ignition scope or an ossciliscope to figure out whats happining with the sparkline.  it could be your airflow meter (can be diagnosed with a 5 gas analizer.  have you checked all the hoses leading to the intake? if you have a vacuum leak the car will run like shit.  you can check for a leak with a propaine tank but i don't recomend an untrained person even attempt it because propaine explosions happen 100's of times a year by poorly trained people attmpting to diagnose a vacuum leak.  you need to know what the exaust has in it to decide what component is at fault.  you can buy a computer to get the code or i think their is a way to get them with a paperclip. checkout:
http://www.roadfly.org/bmw/forums/
-cheers