RB25DET strange shut down on warm idle
Posted: Fri May 02, 2014 6:00 pm
I was working on a RB25DET with type 3 board in it. Car was running good on idle while engine was cold. After the engine reached 60 degrees temperature it shut down like it was turned from key. After that it was not possible to start the car without using throttle. Then it would idle for various amount of time and shut down again.
While the car was driven it was working with no problems, but when let it roll with idle, it shut down again.
When the car was sitting outside for a coffee break, it started well without problems and was running on idle for few minutes and again.
Car was having Z32 MAF modified to a new pipe and added to pressure side and 850cc injectors. After disconnecting and connecting AAC, I didn't notice any change in RPM. We "adjusted" the idle with throttle valve, so that it is a little open but still gives TP closed signal. With that, we managed to keep the car running for quite much better. Could non working AAC do something like that?
Removing connector from TPS caused engine to run around 1700 rpm, and it did not shut down.
Or is it just something in the mapping that it changes from cold/after crank map to some warm maps and there is something wrong in it?
It just felt completely strange. It sounds like someone turns the ignition off. Car was also having turbo timer, which was turned off or not in use at the moment. I found from some forum someone having similar shut down problem and it was found to be from switched off turbo timer, but it was running 30 second this on the time is never same.
- Toni
While the car was driven it was working with no problems, but when let it roll with idle, it shut down again.
When the car was sitting outside for a coffee break, it started well without problems and was running on idle for few minutes and again.
Car was having Z32 MAF modified to a new pipe and added to pressure side and 850cc injectors. After disconnecting and connecting AAC, I didn't notice any change in RPM. We "adjusted" the idle with throttle valve, so that it is a little open but still gives TP closed signal. With that, we managed to keep the car running for quite much better. Could non working AAC do something like that?
Removing connector from TPS caused engine to run around 1700 rpm, and it did not shut down.
Or is it just something in the mapping that it changes from cold/after crank map to some warm maps and there is something wrong in it?
It just felt completely strange. It sounds like someone turns the ignition off. Car was also having turbo timer, which was turned off or not in use at the moment. I found from some forum someone having similar shut down problem and it was found to be from switched off turbo timer, but it was running 30 second this on the time is never same.
- Toni