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99 maxima se hard to start all the time once it starts

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sputters for a quick second...
99 maxima se hard to start all the time once it starts sputters for a quick second and then runs great
Submitted: 2 years ago.Category: Nissan
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Answered in 3 hours by:
11/9/2015
Nissan Mechanic: Jake, Nissan Technician replied 2 years ago
Jake
Jake, Nissan Technician
Category: Nissan
Satisfied Customers: 4,065
Experience: Experienced collision repair technician, Pulaski Tech graduate and DSM hobbyist.
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Hey there, thanks for the question.

Did this just start happening in the cold weather? any smoke or anything when this happens?

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Customer reply replied 2 years ago
When cranking smell gas and light grey smoke during cranking
Nissan Mechanic: Jake, Nissan Technician replied 2 years ago

A couple of things come to mind here.

The first being the center intake manifold gasket thats prone to leaking and causes hard starts on these engines.

The other is the possibility of something leaking into a cylinder (coolant, fuel, oil) when the car sits for awhile. This will create a hard start because of the uncombustible fluid or excessive fuel in the cylinder.

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Customer reply replied 2 years ago
No leaks of fluids or gas change trans before all this started
Nissan Mechanic: Jake, Nissan Technician replied 2 years ago

So all was going normal, then you changed trans and this started?

is this a manual or auto trans?

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Customer reply replied 2 years ago
It's an automatic
Nissan Mechanic: Jake, Nissan Technician replied 2 years ago

can you answer my other question please?

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Customer reply replied 2 years ago
All was normal until transmission swap
Nissan Mechanic: Jake, Nissan Technician replied 2 years ago

Gotcha, more commonly when this happens it's because the crank sensor was not REMOVED BEFORE swapping the transmission. When this happens the sensor is easily damaged on the edges which gives a scratchy wave pattern and causes hard starting.

Best bet at this point is to replace the crank sensor.

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Customer reply replied 2 years ago
Replace both crank sensors and cam sensor with new ones from dealer
Nissan Mechanic: Jake, Nissan Technician replied 2 years ago

anything else you did that you failed to mention? before i make any other suggestions?

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Customer reply replied 2 years ago
Nothing Else
Nissan Mechanic: Jake, Nissan Technician replied 2 years ago

Ok, run a temporary ground from the bellhousing to the battery.

Let me know if it fires right up

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Customer reply replied 2 years ago
It's still hard starting have crank it about 6-10 times
Nissan Mechanic: Jake, Nissan Technician replied 2 years ago

Did you sand the mating surface where the engine and trans come together?

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Nissan Mechanic: Jake, Nissan Technician replied 2 years ago

about the only 2 things you see relating to hard starts from transmission replacements on these cars is either the crank sensor, or grounding issues that i mentioned.

This may not be related to the transmission installation

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Customer reply replied 2 years ago
I know any solution I've tried everything you've mentioned so far
Nissan Mechanic: Jake, Nissan Technician replied 2 years ago

Have you checked the actual starter itself? made sure it wasn't loose or anything? not making any weird noises when starting?

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Customer reply replied 2 years ago
New starter
Nissan Mechanic: Jake, Nissan Technician replied 2 years ago

Why did you replace the starter?

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Customer reply replied 2 years ago
It went bad from all cranking trying to start the car it started this morning no problem got to work when it was time to come home it about 10/minutes of cranking to get it started
Nissan Mechanic: Jake, Nissan Technician replied 2 years ago

At this point you may want to scope the crank sensor to see what kind of signal your getting.

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Customer reply replied 2 years ago
Had all that done at a shop they replace crank sensor and cam sensor iwas told the idle air valve will make it hard to start
Nissan Mechanic: Jake, Nissan Technician replied 2 years ago

There is of course other things that would cause a hard start completely unrelated to the transmission install itself.

Just seems a little peculiar that you had none of these issues prior to the replacement.

you could rule out the IAC hard starting by simply depressing the gas pedal slightly when starting.

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Customer reply replied 2 years ago
I was told that it helps but not much also when starting car or kinda back fire through air filter at times
Nissan Mechanic: Jake, Nissan Technician replied 2 years ago

backfiring through the intake could be from a couple different things, could be excessive fuel from a leaky injector, a bent intake valve, timing being off, or a poor/weak ignition signal.

Generally the weak ignition signal though will cause the backfire sensation at heavy acceleration as well, not just trying to start.

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Customer reply replied 2 years ago
What would cause weak ignition signal
Nissan Mechanic: Jake, Nissan Technician replied 2 years ago

having 1 or more weak coils or a bad ground.

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Customer reply replied 2 years ago
It's grounded from starter BOLT to negative side of battery
Nissan Mechanic: Jake, Nissan Technician replied 2 years ago

the ignition ground is on the intake manifold also.

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Customer reply replied 2 years ago
Ok is there a way to test the coils and what should I test
Nissan Mechanic: Jake, Nissan Technician replied 2 years ago

The coils are very difficult to test accurately with a meter. The best test on these coils is to pull them and crank the engine.

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Nissan Mechanic: Jake, Nissan Technician replied 2 years ago

I would start with an easy test to see if your bleeding off static fuel pressure.

Use a T-fitting and test idle fuel pressure, then cut the engine off and pin the soft lines and see if the pressure bleeds off. If so then an injector is leaking.

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Customer reply replied 2 years ago
I went to used auto salvage an replaced the coils it starts alot better but have to press on accelerator slightly and it fires right up
Nissan Mechanic: Jake, Nissan Technician replied 2 years ago

That being the case its probably only 1 of two things here.

Either the engine is flooding out, or your not getting enough air in the engine for some reason. (IAC is not operating with key to ON like it should, or air filter clogged)

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Nissan Mechanic: Jake, Nissan Technician replied 2 years ago

Never heard back from you.

if you need further help let me know, if not be sure to leave a kind rating please.

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Customer reply replied 2 years ago
How would I check to see if IAC is operational with key in on position
Nissan Mechanic: Jake, Nissan Technician replied 2 years ago

BEST way is to either remove it and turn key ON and watch it or use a stethescope and listen to it when key turned to ON.

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