Hello!...and a question!
I have 1995 325IC at ~89 K miles. The car has both automatic and manual options. I have a problem and would like to ask your suggestions or opinions. Thanks in advance!
When I am driving in automatic mode (D), [regardless of cold or warm engine / regardless of A/C running or not /regardless of my acceleration is gentle or aggressive], sometimes, I lose power (i.e., the RPM suddenly goes down from 2000 to 1000 for 2 seconds) and I feel a rocking (or, back and forth) movement and I can actually hear cranking from the transmission as if it is trying to engage to a lower or higher gear. Then RPM picks up, if I keep my foot on gas pedal and the gear change is back to normal. If I need to stop at a sign or at the lights, I get the same inconsistent RPM when the engine is running idle (RPM suddenly goes up to 1000 several times -whereas it should be around 500) and the transmission makes that cranking sound.
When I am driving in manual mode however, everything seems to be perfect.
I took the car to three different services, two of them are certified BMW service centers. The diagnostic computers did not pick up any codes, my transmission lamp is not lit and the trip computer's check mode comes clean every time I run systems check. I know it works because it recently gave a warning about the coolant level and it was accurate!
One of the mechanics suggested that the chip, which is controlling the timing of the automatic transmission (?), may be faulty since the problem is intermittent and occurs only in the automatic mode.
I will appreciate your insights!