2004 Nissan 350Z Start up

Tiny
LUIS350
  • MEMBER
  • 2004 NISSAN 350Z
  • 6 CYL
  • RWD
  • AUTOMATIC
  • 10,094 MILES
When I start my 04 350z the rpms go up and for a quick second when I first start it up.
What could it be
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Friday, April 11th, 2014 AT 8:52 PM

7 Replies

Tiny
CARADIODOC
  • EXPERT
That's called "idle flare-up" and is what all electronically fuel injected engines are supposed to do.
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Saturday, April 12th, 2014 AT 11:37 AM
Tiny
LUIS350
  • MEMBER
But why is it that sometimes I turn the car on it idles under 1 rpms
And sometimes the car turns off.
I even have to give it gas so it stays on
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Sunday, April 20th, 2014 AT 8:58 AM
Tiny
CARADIODOC
  • EXPERT
That's a completely different symptom. There's two common things to consider. One is the idle speed motor is sticking or the air passage is plugged, or the battery was recently disconnected or run dead, and the Engine Computer lost its memory, including what is commonly called "minimum throttle". Most cars have a procedure for the relearn to take place, and most of the time it just involves meeting a few specific conditions while driving. For example, with Chrysler products, you drive at highway speed with the engine warmed up, then coast for at least seven seconds without touching the pedals. Until that relearn is done, the engine will idle too slowly and may be hard to start and may stall st stop signs unless you hold the accelerator pedal down 1/4".
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Sunday, April 20th, 2014 AT 6:41 PM
Tiny
LUIS350
  • MEMBER
I did change the battery a while back ago.
What can I do to fix this. Any info will help
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Sunday, April 20th, 2014 AT 6:59 PM
Tiny
CARADIODOC
  • EXPERT
Sorry for the delay. I saw your post yesterday, just in time for my laptop battery to die.

I only know the relearn procedure for Chrysler products. Some other brands are similar, and some don't show any symptoms. If you've been driving the car like this for weeks, you should have met the conditions necessary for any relearn to take place. The service advisers at the dealership should be able to tell you what, if anything, is required during the drive cycle. If they say there is nothing special you have to do, then you'll need to look at the automatic idle speed system. You'll need a scanner to allow you to command the Engine Computer to raise the idle speed to various settings to see if the system is working. Most independent repair shops will have aftermarket scanners capable of doing that. If the scanner says it's commanding a higher idle speed, but the engine doesn't respond, the idle speed motor is sticking or the air passage is plugged with carbon. We used to see a lot of carbon trouble, but that's much less common today with better additives in the fuel.
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Monday, April 21st, 2014 AT 4:24 PM
Tiny
LUIS350
  • MEMBER
I just noticed that yesterday while driving I smelled gas.
I'm don't see anything leaking. So I'm going to check my fuel injectors
Where else should I check
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Saturday, May 10th, 2014 AT 5:19 AM
Tiny
CARADIODOC
  • EXPERT
Common things to check are the rubber hoses that run from the steel fuel lines on the body to the engine, the o-rings around the injectors, the obvious steel lines under the car, and if your engine uses a fuel pressure regulator on the fuel rail on the engine, pull the vacuum hose off and check for fuel inside that hose.
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Saturday, May 10th, 2014 AT 10:13 AM

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