Forums/Z31P/z31-performance-upgrade-forums engine-mechanical-aa/Engine cut out during hard pullls
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baseball: (2014-04-07 00:45:01)
87 300zx turbo, currently 330hp at the wheels.
Cars been worked on for about 10 years, last
year, finally got the car turned, runs great, but
sometimes the engine cuts out. I'll have to pay
attention and perhaps hook up my nistune and
do some data logging. Any thoughts as to what
might be causing this would be appreciated or
at least where to look.
jaqattack02: (2014-04-07 01:18:09)
More info would be helpful. What do you mean by "cuts out"? Turns off altogether? Stumbles and loses power?
baseball: (2014-04-07 01:52:08)
all the idiot lights turn on and the engine is off.
one tidbit, there is a known back pressure issue
with the existing turbo. that's why I'm only
hitting 330hp at the wheel - to be replaced
later this summer.
G-E: (2014-04-07 02:55:04)
Something harness related, either a main hot wire or ground is becoming disconnected or shorting…
Check the alternator harness and battery cables/terminals, is your battery even tied down?
baseball: (2014-04-07 14:49:19)
Yes, the battery is tied down - I'll check the other things you mentioned. I'm also wondering is something is triggering the ECU to turn the car off?
jaqattack02: (2014-04-07 16:04:47)
Yes, the battery is tied down - I'll check the other things you mentioned. I'm also wondering is something is triggering the ECU to turn the car off?
I don't think there is a function in the ECU to just turn the car off.
baseball: (2014-04-07 16:43:23)
I don't think there is a function in the ECU to just turn the car off.
I was thinking in a critical situation whereby you run too lean or rich, perhaps it might?
jaqattack02: (2014-04-07 17:24:33)
I was thinking in a critical situation whereby you run too lean or rich, perhaps it might?
Nope, these ECUs are old and dumb. They would do their best to keep things safe, but they would just let your engine kill itself if they can't keep up.
300zxturboftw: (2014-04-07 18:10:45)
I'd the tune was working fine before then it's definitely mechanical or electrical
baseball: (2014-04-08 04:22:30)
The car has been worked on for the past 10 years, I just had it tuned, for all intense of purposes, for the 1st time last fall - thus I'm driving it 'really' for the 1st time with all the mods. I don't really have a baseline to compare it to, so perhaps I will go off the assumption it's probably electrical, since the ecu from what I'm told won't cut the engine if it detects a critical state.
I'd the tune was working fine before then it's definitely mechanical or electrical
baseball: (2014-04-08 04:24:51)
Good to know, LOL - thanks.
I'd the tune was working fine before then it's definitely mechanical or electrical
300zxturboftw: (2014-04-08 05:17:26)
If you're having issues it could be the tune if you just tuned it then. The map and other settings can cut out fuel and also cause a bunch of other issues.