Roberts Aerospace
SPONSOR: Maseratished
- Messages
- 47
I'm not sure how often I need to say this, but, it's not the throttle body! I have collected a whole load of data from this car with several different throttle bodies fitted including a nearly new unit that I use for reference. The data coming out of the ECU is always the same.
The problem is that for 12 seconds from a hot start, the ECU "MIN. TARGET REVOLUTIONS" parameter is about 2700RPM. For a cold start it is about 1300RPM - which is normal. Any other car has a hot start target of about 1100RPM. The engine is doing exactly what it is told to do by the ECU, which is to run at nearly 3000RPM for 12 seconds.
What needs to be found is why the ECU has decided to instruct the engine to run at higher than usual RPM, there's nothing in the data to suggest why, and I cannot think of any circumstances why someone writing the ECU software would require the engine to run at that speed at start up without triggering some sort of "out of acceptable range" error for one parameter or another.
Mike.
The problem is that for 12 seconds from a hot start, the ECU "MIN. TARGET REVOLUTIONS" parameter is about 2700RPM. For a cold start it is about 1300RPM - which is normal. Any other car has a hot start target of about 1100RPM. The engine is doing exactly what it is told to do by the ECU, which is to run at nearly 3000RPM for 12 seconds.
What needs to be found is why the ECU has decided to instruct the engine to run at higher than usual RPM, there's nothing in the data to suggest why, and I cannot think of any circumstances why someone writing the ECU software would require the engine to run at that speed at start up without triggering some sort of "out of acceptable range" error for one parameter or another.
Mike.