I have had random cut out problems with my newly acquired 1993 3.0L M3. I have only driven the car thrice, but the trip home from the seller (8 hours) had it die on me several times, once in a tunnel 200+ m. below sea level which was slightly unnerving
I have been unable to get INPA to connect to the DME, it throws an error asking for a file, so I don't have any fault codes from the DME. I can connect to the other ADS modules.
- It cuts out without any warning. It seems only to happen when warm. There is no dimming of lights etc.
- When slowly increasing the revs I found that it drops about 300 exactly at 1500rpms. I can easily replicate this. If I keep the throttle at exactly 1500 the revs will oscillate. The climb to 1500 and abruptly drop to 1200 only to climb back up and dropping again. See video below. When the engine is cold it is incredibly hard to hit 1500rpms. It seems to just steadily climb past. It was easier to let the revs drop down to 1500, which produced no oscillations. I managed to hit 1500 a couple of times when climbing up to it. This produced no oscillations until the engine heated up. Then the oscillations returned.
- The engine stumbles a little bit in the lower half of the RPMs. You have to pay attention to feel it, but it definitely misses a beat now and then. It makes a slight burble when it does.
- Unplugging the MAF makes little difference. I have not tried running it at 1500 without the MAF.
- The engine revs freely, and from memory the car pulled well. Maybe less than expected, but this is my first BMW.
- There is more exhaust than expected, but it does not smell of fuel. It is more white than blue. There is no pressure or signs of oil in the coolant system.
I found these faults in the KOMBI instrument cluster.
And this for the ZV36 Module:
Here's the movie I shot of the tacho.