REDBULLSTX

iTrader: (4)

Ok so a little background... My car has a haltech e6x. It works flawlessly. My fuel pump is fine. I have plenty of very good grounds. With that said. Every now and then the car just shuts off. It doesn't matter if its driving down the road or parked and idling. Its completely random. It may do it 15 seconds after it starts or 15 minute. It will die and then when I try to restart it it acts flooded. I turns over and over and finally sputters to life. I have to rev it out to get it to clear up while it billows smoke. It finally clears up and runs like a champ until it just randomly does it again. One wierd thing is that when it dies the tach drops to 0. Even if the car is still in gear and the engine is still turning. When it first happened it was in the 50s outside. I drove it all summer and it never did it once. Now saturday night it dropped down in the 40s and it did it several times on the way home. The outside temp is the only thing that I can think of that could be causing it. But it will run fine for the whole night and then just randomly shut off. Any help or any ideas to the possible cause would be greatly appreciated. And just so you know I DID search every rotary forum out there before I decided to finally make a thread. And FWIW I'm not a dumbass or some kid that doesn't know about these cars. I have 3 rx7s that I have built myself. So no smart *** comments please.

blkops

Map sensor wiring... At least I had that problem. Is it idling really low ?

ondabirdhouse

iTrader: (26)

I would check the wiring to the Crank Angle Sensors. it sounds like it looses the signal from CAS and stops fuel, spark, etc. and then continues to burn what little fuel is still in the engine. Maybe the cold weather is making the wiring stiff and more prone to bumps and vibrations if there is a wiring problem.

Have you done any data logging? it would tell you exactly whats happening.

Mahjik

iTrader: (1)

First thing to check is the wiring on the (US) driver's side of the engine bay. It's a common occurrence for people to get wheels that end up rubbing through the liner and fraying the harness. This will give similar symptoms as you described.

turbojeff

iTrader: (30)

X2 on what Mahjik said. Look above the drivers wheel to see if the wiring is damaged.

Does it happen when you turn right?

REDBULLSTX

iTrader: (4)

Map sensor reads correctly even when it does shut off. I have had the laptop on it when it has happened and I can say without a doubt that its not the MAP sensor. CAS sensor wiring kinda makes sense because of the tach stopping when it happens. But outside temperature couldn't affect that because underhood temps don't change with outdoor temps. Its always hot under the hood. Logging doesn't show anything out of the ordinary. Honestly it has never shut off while I'm turning. It usually happens when its parked and idling or driving straight down the highway. But like I say. It was happening in February and March. Then it didn't do it all summer. Then the first time that it drops down in the 50s it did it again. And it might not do it again for 3 weeks. Then it will do it 5 times in one day. Its baffling me.

REDBULLSTX

iTrader: (4)

When it first happened I went through all of the grounds. I ran extra ground straps. And even tied the ignition and coil ground to the chassis and battery. I thought that fixed it. It didn't do it again til this past saturday night. So now I'm stumped all over again.

SA3R

I had this issue happen to me three weeks ago.

My car would stall 15 minutes after starting, or an hour, maybe once a day or 15 times a day, in all situations and all gears. It was borderline crazy dangerous.

I have a stock ECU, so I am able to pull error codes. I did this, and it turned out to be the coolant temperature sensor going faulty, and sometimes no signal at all and the car would die.

Check/replace your coolant sensor. I would give this an 85% probability that this is the cause. Your symptoms are mostly identical to mine, except that you have an aftermarket ECU.

See here for some more info if you think it could be this: https://www.rx7club.com/3rd-generati...tarts-1047832/

palthyboy

Hey so were you able to figure out the issue? I am running into a similar issue. My car is pretty much bone stock has a turbo timer, boost controller, an intake and cat back and thats it. I changed my trans/diff fluid along with the oil and changed the spark plugs( not the wires since I couldn't follow them to where they were connected. After I did this change is when I had this happen to me so maybe i need to replace the wires too? either way car never shut off on me until today, and its been a couple of days since I replaced them and have driven the car a total of 2 hours drive/run time since the change.

Anyways I washed the car today, moved it from the drive way to the garage and while I was letting it run for a few minutes since I had just started it and then it just randomly cuts off, and then when I tried to turn it on again it was start and then shut right back off, then the third time I tried to crank it, it took a second im assuming b/c it must've gotten flooded but after a little bit it started up and I hit the gas and revved it up to 4 grand for a minute or two and then eased off the throttle where the car idled again for a few minutes no issues and I turned it off.

Any idea of what could be wrong?

DaleClark

iTrader: (55)

The OP had a modified car so that's a whole different set of potential causes.

What plugs did you put in?

Are you certain you didn't mix up the plug wires when re-installing?

Considering this happened once and under the circumstances I think it just randomly stalled. I wouldn't worry about that too hard. I think you did cold start flood the engine - just letting it idle for a bit sometimes isn't enough, you need to get some heat into the spark plugs. A simple drive around the block will do the trick there. Anytime you start the car stone cold, move it, and shut it down you run the risk of flooding it.

Get the car running, go on a good drive to get it all the way up to temp, and see how it does.

Dale

palthyboy

I will double check that I didnt mix up any of the plugs I put in, but I took them out one at a time and put them back in the same way, did the rear rotor housing first and then the front. I got 2 of the BUR9eqp, and 2 of the BUR7eqp's. I dont think I mixed up the wires either since the leading and tailing wires were different lengths and colors but I can double check that again as well.

It seems to be that to me as well, I cranked it this morning let it run for half an hour, the car was idling at a steady what looked like 800 rpm, if I turned on the lights it bumped up some and held there as well, and then took it for a drive for about an hour and a half and didn't give me any issues. It just seems strange to me that it did that haha but who knows I thought I had let it warm up enough before I pulled it into the garage, apparently not.

I am about to take it on a 3 hour road trip so wanted to be sure theres no funny business haha dont want to get stranded.