Hi, recently on my rx7 single turbo fd i was accelerating on gear and suddenly the car shut down when still on gear (no rpm reading) then it started up alone while on gear (the rpm started reading again) ... This repeated itself the same day for 3-4x until when i was cruising and put it in neutral gear, it shut off and gave me a hard time to start, i sat a side on the street for about 5 mins and it started up again like never happened. Next day i tried going out again and was working normal until i made a 1st-3rd gear pull and when i put it in neutral shut off again, it didn't want to start from ignition and i started it on gear and the same as the previous event it worked like nothing ever happened. ​​​​​I have a haltech ecu 1500 and a fault popped up, im assuming the CAS (crank angle sensors) are failing somehow.... Any help is much appreciated thanksHi, recently on my rx7 single turbo fd i was accelerating on gear and suddenly the car shut down when still on gear (no rpm reading) then it started up alone while on gear (the rpm started reading again) ... This repeated itself the same day for 3-4x until when i was cruising and put it in neutral gear, it shut off and gave me a hard time to start, i sat a side on the street for about 5 mins and it started up again like never happened. Next day i tried going out again and was working normal until i made a 1st-3rd gear pull and when i put it in neutral shut off again, it didn't want to start from ignition and i started it on gear and the same as the previous event it worked like nothing ever happened.

​​​​​I have a haltech ecu 1500 and a fault popped up, im assuming the CAS (crank angle sensors).... I changed them both,changed alternator, checked alternator wireing, swapped Engine main relay and circuit relay for new ones, changed the ignition switch too, the problem is now constant every time i try to accelerate "on load/on boost" approximately 4.5-5.5k rev the car shuts down, and immediately re-starts again, ecu will shut down and freeze on laptop, the cluster rev reads 0 although the engine i hear it still working, than everyting restores ...rev..ecu reading in laptop, and reading on map is engine out of timeing amd lean on fuel since everything shuts down by itself and magically starts again.

Any help is much appreciated thanks in advance. (See picture attached for fault) the wideband sensor fault was already happening prior this situation i already tackled that problem in advance. (See picture attached for fault) the wideband sensor fault was already happening prior this situation i already tackled that problem

 

Are any of the engine protection features turned on? If a setting accidentally got changed maybe the ECU is commanding the shutdown as it thinks something bad is happening. With regards to engine protection I can't help much more as I'm just starting to use this feature and haven't gotten far enough or brave enough to test engine shutdown options, i.e. just monitoring conditions and throwing codes.

In this post in another section I saw your had injector duty cycle past 90%, That is an issue you need to get resolved as you risk lean run issues or stupid rich issues..

On my FD I see engine position errors from time to time but only when over 7500 rpm. The worse I have noticed in any was a tiny stumble in one out of about 8 instances.

 

OP if this is the case, I suppose you could be heating up the injector drivers to the point of shutting down. When the car dies are you still getting data feedback from the ECU or is the ECU completely off?

Is your ECU getting hot?

I had this issue once with my Sprint RE. Ended up being a bad connection to main power for the ECU.

 

​​​​​​YEs i have protection on wideband sensor, for lean mixtures, and some other ones. But when i had issues with my o2 sensor the saftey trigger was "02 sensor failure" ... The strange thing is that the car + ecu are shutting down its a strange thing when the ignition is still turned on like everything is shut down then magically it starts again by itself. And all my saftey settings are to go into limiter at 4k revs to still be able to drive the car to my home.

Could it be a fried ecu ?

 

When the car dies the ecu shuts down and the readings on the laptop freeze. i still hear the engine running very weak but then it runs normal after some seconds and the ecu starts reading again. ...i didnt check if the ecu gets hot. I didnt do any mods before the problem started to happen, i only raced the car for a couple of km. Nothing crazy just couple of pulls.

 

I'd double check the ECU power circuits and grounds before diving into other issues, then confim that the ECU isn't heating up.