Why the ocassional pause when starting?

SouthArk370Z

Thanks for the reply.

Since it seems to affect all 370Zs, not just those that pulled the SLU fuse, I'm not really worried about it, just a gnawing curiosity. I'm not losing any sleep over it, but would like to know why it happens.

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ProfessorDave

It is weird to not hear the unlocking of the steering wheel once you press the start button after the fuse pull. Perhaps it creates the illusion of a delay?

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SouthArk370Z

Reasonable theory, but there is a definite delay. Most ppl are reporting 1-3 seconds. Last time it happened to me, I was reaching to press the button again (thought I may not have pressed the button properly) when it finally started.

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DLSTR

I blame ethanol

scgolfer7

In all honesty, I think it is something to do with some kind of software reset, maybe the ECU purges some cache or something; that seems like the most logical thing I can think of.

SouthArk370Z

Sounds like one of the better theories to me. My personal favorite is that the system is doing an extra self-test (but that doesn't explain why it only happens some of the time).

A few ppl have reported that the driver door being open for a long time may trip the delay, but I haven't been able to reproduce it.

Maybe someone will come up with the answer, but I'm not holding my breath.

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mayday813

I experienced the approx. 3 second delay today again. Just got in the vehicle and pressed the start button and the delay occurred. Didn't leave the door open for an inordinate amount of time. I tend to think that SCGOLFER7 may be on to something since the BCM appears to send signals to the ECU to verify some of the system checks. This would explain the diagnostic procedure noted in NTB12-041.
Has anyone had a dealer perform the procedure describe in NTB12-041?

SouthArk370Z

I think what you, I, and golfer are talking about is pretty much the same thing - an extra system startup routine that gets executed for some reason. Whether that is a memory purge or a self-check or something else remains to be seen.

I haven't noticed anyone posting about doing a BCM reflash, but I can't read all the posts.

I just read over NTB12-041 again and I can't tell for sure if the two are related or not. The startup symptoms are the same, but I don't remember anyone reporting that they couldn't shut the engine off with an SLU failure. But I've read a lot of SLU posts and may have flushed that particular piece of info.
It would be interesting to find out if they are related or not. If someone has been unable to shutdown because of SLU failure, I would consider that to be strong evidence for.

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luigi90210

probably just going through the usual system checks, checking steering wheel lock and unlocking it, making sure there is fuel in the tank, making sure everything is all good to start without damaging the motor, or ecu delay

its all drive by wire tbh and as much as i like my start button, it just doesnt replace the key-barrel

IDZRVIT

If you've pulled the SLU fuse your car won't start after 21 Dec 2012.

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JARblue

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Cmike2780

I was told it would explode if you installed a GT-R button.

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TheGreatOne

lol, funny posts in here

Happened to me a few times, I just figured I didn't hold the button long enough so it didn't crank...but as long as it starts! lol

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JohnsZ

Awww....come on Ken, be nice! After all, tis the season! I care and can relate to what the op is saying. I have wondered about this ever since I got mine and to be honest, I do find it annoying at times. At times after holding my finger on the button without it starting, I will take it off just before it was going to start and will have to do it again. It's a minor 370Z annoyance but no less an annoyance. Merry Christmas

JARblue

I FINALLY had the privilege of experiencing this delay after removing my fuse several weeks ago. Two full seconds for sure. I don't care that it happens; I'm just curious about why it happens.

I do not have to hold down the start button to start the Z. You should be able to simply push it once briefly and let go. Usually it begins the sequence as I'm letting off the button or right after, but what I just experienced the other day was I pushed the button quickly and there was a significant delay even after letting off. In fact, during this delay I was able to fully buckle my seat belt before the car started.

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