Rx7 shutting down by itself
 

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
https://cimg1.ibsrv.net/gimg/www.rx7...b6d92fa81c.jpg

Wow, that was one tough wall of text to read.

Either the power to the Haltech is getting interrupted or you have a problem with the signal from the CAS. I'm not super familiar with the Haltech so there could be other issues, may be worth a post in the Haltech forum.

Do you have a new harness from the Haltech to the engine or do you have a plug-and-play setup using the existing harness?

Dale

Hmm, I got that "engine position error" once at a track. It didn't cause my car to shut down and I didn't notice any performance difference, and wouldn't have suspected anything happened at all until I checked the logs and saw the fault code. So I'm assuming if it in fact is a CAS problem, then it's a prolonged one.

Weirder to me is that the ECU would lock up in that situation. I really think that's not ever supposed to happen, even if a fault occurs. Can you see the ECU itself? The next time it happens, I'd look and check to see if the little power / status light is still on, and not solidly off or flashing some weird color or error code. Can you pull a log after the event happens? You should be able to chart CAS faults, battery voltage, and I think internal ECU voltage as well (almost positive, but I'm not looking at my tuning PC so can't check). The more info you can get at the time of fault, the easier it'll be to diagnose. You might even contact Haltech tech support if you suspect an ECU problem.

Keep us posted and good luck!