Question about 1995 Nissan Maxima

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1998 Nissan Maxima

Cold starting problem mostly / I changed the Coolent temp sensor think that would do it / no fix / Sometimes need to push the gas pedal down / When it start up Idles and runs fine / Any sugestions ??

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  • bau044 Jan 21, 2009

    I originally had problems starting the engine. After about 5 cranks, it would usually start. When the car would start, it runs like new without any hesitation or misfires. Now, the engine turns over, but it will not start at all.


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You may have a problem with the check valve in the fuel pump, if this valve is defective the gas drains back to the fuel tank and causes long crank times, you can test this by hooking up a fuel pressure guage at the fuel injector fuel supply line on the top of the engine, run the engine for a moment and quickly record the pressure when you shut down, that pressure reading should not drop more than 5 PSI overnight, if the check valve is bad the pressure will most likely start to drop right away, but do the over night test anyway. If this is the problem you will need to replace the fuel pump in the gas tank.

Posted on Nov 03, 2008

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Dying, not starting after it's been warmed up. Runs beautiful on cold engine. Replaced plugs, wire, cap, rotor and crank position sensor, no luck.

Your car cold start valve puts more gas into the system keeping your engine running higher RPM. When you car warms up, the cold start valve will stop working and your car RPM will drop. What you could have is a vacuum hose disconnected which puts more air into your engine - therefore when you press on the gas pedal, your engine would shut off or you find lack of power and then shut off.

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This can actually be several things but most common is the coolant temp sensor, it tells the computer how much fuel to give the engine depending on temp, if the sensor goes bad then it may be giving engine too much fuel when it's warm, which may be why it starts fine cold cause it needs more fuel to start cold, try holding the gas pedal to the floor when u start it warm, if it does start and run rough for a few seconds it's cause it was flooded due to excessive fuel.. Get scanned for any trouble codes..

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When car warms up it misses and dies and is hard to start what do you think is wrong

I am going to guess at the easiest first .
I will attempt to explain my reasoning without going into it so far as to bore anyone...

Coolent tempreture sensor ;
When the car is cold it starts fine , as it warms up (coolent temp sensor) the ECM is signaled to decrese the rich fuel mixture (choke).

Test coolent sensor for variences in reading with an ohm meter to verify the sensors condition.

Plugged fuel filter;
Cold start , fuel is sedentary allowing particles to settle (paired with the enrichened fuel mixture of cold start), Then when warmed the particles are clogging the filter and the fuel enrichment of the cold start is no longer helping the starving condition...

Its hard to diagnose with what little information you have provided.
If you are ghetting a code , take it to the nearest AutoZone and get a free diagnostic done.

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