Hello everyone,
I recently bought a 318is road rally car with a recently rebuilt M42 engine in it (rebuilt in the last 3000 miles). The car was running well when I bought it, plenty of power and free revving, and always starts on the button. However the car had what I would consider a high idle when warm (say between 1100-1300rpm). I have since done around 600 hard miles in it to get to know the car and it has developed a fault where by it now won't idle (just cuts out, warm or cold) and is rough between 2000-3000 rpm. Above that it still runs fine up to 6k rpm.
I was just wondering what is the best way to start to determine where the fault lies is? I have disconnected the AFM and the car runs but idles roughly at around 2500rpm. The IAT sensor is disconnected due to cone filter. Everything else is standard I think, although I don't know exactly what specs the engine was rebuilt to so I am trying to get in touch with the builder.
I tried doing the smoke test around the intake to check for unmetred air but the air thrown off the vanes on the alternator make it difficult to assess whats going on! I was going to do a compression test next to see what the figures are.
Any assistance would be much appreciated.
I recently bought a 318is road rally car with a recently rebuilt M42 engine in it (rebuilt in the last 3000 miles). The car was running well when I bought it, plenty of power and free revving, and always starts on the button. However the car had what I would consider a high idle when warm (say between 1100-1300rpm). I have since done around 600 hard miles in it to get to know the car and it has developed a fault where by it now won't idle (just cuts out, warm or cold) and is rough between 2000-3000 rpm. Above that it still runs fine up to 6k rpm.
I was just wondering what is the best way to start to determine where the fault lies is? I have disconnected the AFM and the car runs but idles roughly at around 2500rpm. The IAT sensor is disconnected due to cone filter. Everything else is standard I think, although I don't know exactly what specs the engine was rebuilt to so I am trying to get in touch with the builder.
I tried doing the smoke test around the intake to check for unmetred air but the air thrown off the vanes on the alternator make it difficult to assess whats going on! I was going to do a compression test next to see what the figures are.
Any assistance would be much appreciated.
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