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 Post subject: cold start trouble
PostPosted: Tue Apr 16, 2013 11:02 am 
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Joined: Mon May 16, 2011 5:25 pm
Posts: 3
I'm having trouble starting my 96 tt when it's cold. Once it starts it's fine, no other issues. Once it's warm it starts fine. Anyone come across this before?

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96 300ZX Twin Turbo, California car w/ 48k miles, Black on black, 5 speed, 19" rims


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 Post subject:
PostPosted: Tue Apr 16, 2013 11:04 am 
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Joined: Sun Apr 01, 2012 4:19 pm
Posts: 1644
What does it do when you try to start it? (On a cold start)


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 Post subject: cold start trouble
PostPosted: Tue Apr 16, 2013 11:21 am 
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Joined: Mon May 16, 2011 5:25 pm
Posts: 3
It cranks strong for a while then will "kick over" quickly and die. As you continue to crank the "kick over" may last longer till it finally starts. I doesn't seem to matter what position the pedal is at.

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96 300ZX Twin Turbo, California car w/ 48k miles, Black on black, 5 speed, 19" rims


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 Post subject:
PostPosted: Tue Apr 16, 2013 6:54 pm 
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Joined: Wed Apr 09, 2008 5:53 pm
Posts: 12934
Location: CT
Hi Moose ~

In my experience (240Z only), that describes the wrong spark plugs. You would have igniters in the Zx so that's unlikely to be the problem.

Ask someone to crank the engine for you while you check for a strong spark. Most of us just pull a plug wire, insert a metal rod into the plug wire and hold it close to an engine part (ground). A good, healthy spark jumping from the metal rod to the engine should tell you your ignition system is working OK. If it isn't, that gives you a place to start looking for trouble. (Be careful not to touch the metal rod, and not to let anything contact the moving fan blades).

If spark's OK, move on to fuel. Ask the friend to crank it while you squirt some starting fluid into the intake (anywhere convenient). If the engine fires right up then dies, you know it wasn't getting the right air/ fuel mixture and the starting fluid temporarily replaced it.

How many miles on the car and how long since a good tune up, do you know?

Frank

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1970 240Z


Last edited by Frank T on Tue Apr 16, 2013 7:30 pm, edited 1 time in total.

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 Post subject:
PostPosted: Tue Apr 16, 2013 7:21 pm 
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Joined: Mon May 19, 2008 8:17 pm
Posts: 2112
Location: Colchester, Ct
It may be that you are losing fuel pressure overnight. Try turning the key to the On position but not far enough to have it crank over. You should hear the fuel pump come on and then shut off after 5 seconds. This will pressurize the fuel line and rails. Once the pump shuts off, turn the key to start and crank it over.

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Phil
1981 280zxt


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 Post subject:
PostPosted: Wed Apr 17, 2013 7:27 am 
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Joined: Wed Jul 23, 2008 2:38 pm
Posts: 3098
Location: rhode island
Do what Phil said, but if your losing fuel pressure, could be leaking injectors. Try starting it with the gas pedal all the way down to the floor, DO NOT pump the pedal. Then just let off once it starts. Usually when I do this to a car it needs spark plugs and a good tune up.


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 Post subject:
PostPosted: Wed Apr 17, 2013 9:31 am 
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Joined: Sun Feb 15, 2009 6:47 pm
Posts: 307
Location: Niagara falls, NY
I'm not sure about your newer car, but on earlier z's, your problem would be caused by a bad cold start injector. We have an extra small injector , placed just downstream of the throttle plate, in the throttle body, which adds fuel to the mix when the motor is cold. This injector is controlled by the thermotime switch. A bad injector or thermotime switch (the switch is the usual source of the problem) gives the exact symptoms you describe.

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71 on a rotisserie, two more in pieces in my shed...and a 69 1600 waiting for me to get to it


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