R33 gtst shutting off while driving randomly

[mattm21]

Hi guys a recently purchased R33 Gtst automatic is driving normally some days then it'll just completely lose responsiveness but once stopped the key will start the car as if nothing had just happened. if anyone has experience with this issue that would be extremely helpful. The mechanic we brought it to said they "fixed it" but no it definitely was not fixed. Please if anyone has experience anything would help, Thank you!

[Duncan]

We're going to need a little more information for useful internet mechanicing.

Does it stall when you are driving along in gear, when you are stationary or both? does it run roughly at idle? does it pull smoothly all the way to redline if you mash the throttle from say 0-100?

And, what did your mechanic do to "fix it"?

[mattm21]

Yes of course, it idles fine and will drive fine at times. However once it even died while idling from a cold start. Other than that it happens when driving at cruising speeds like around 70 mph. it'll pull smoothly to 100 as well. The mechanic only said that they fixed "some wires". unfortunately while trying to get a hold of them they aren't available.

[GTSBoy]

55 minutes ago, mattm21 said:

R33 gtst shutting off while driving randomly

So don't drive randomly?

/boom tish

This problem could be caused by almost any of the thousand common problems, from dirty TB to dodgy connections at the AFM or CAS, sick coilpacks or loom plugs/wires to them, the automatic could be doing the dirty, the fuel pump could be dying.

To find it you will need to instrument the car and drive it until it dies, and hopefully not what went wrong as it died. By "instrument" I mean, put on a fuel pressure gauge, connect up a Consult logger, and so on. Anything you can do to gather information.

Otherwise, as Duncan said, we can't diagnose random shitbox death across the internet. It's not like there's only one cause for this to happen.

[mattm21]

ty for the info! We are going to try with the AFM to start off with because it seems to cause most of the symptoms that we are experiencing. I will definitely utilize the list you created for me though!

[Duncan]

funnily enough, a car that dies while suddenly driving otherwise fine is a good chance of being electrical, causing the ECU to shut off.

I guess you have the standard ECU so it is hard to tell if it has power just by looking. If so, a consult cable and logging software will tell you if that (or many other potential reasons) is happening.

I had a similar problem with the Stagea for a while caused by loose wires added at the positive battery terminals

[GTSBoy]

36 minutes ago, Duncan said:

funnily enough, a car that dies while suddenly driving otherwise fine is a good chance of being electrical, causing the ECU to shut off

Actually, further to this, there has been some traffic in reports of the ECCS relay (the one that powers the ECU) and the ignition relay (the one that powers the ignition coils) dying of old age (or perhaps abuse) lately. R33s are pretty vintage now, so it shouldn't be surprising that those relays could be to blame, and/or the wiring associated with them. They do handle a reasonably large amount of current, so dodgy broken wires can cause all sorts of shit behaviour, but still look like they should work.

[funkymonkey]

This you?

As I mentioned in the thread, I'd be checking if it was a faulty exhaust temp sensor forcing the car to go into limp mode while you're driving.