98 Nissan Sentra hard to start when hot

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carnvperson - 12 Dec 2006 19:43 GMT

Hi all,

I am having problem with my Nissan Sentra GXE about 85k miles. Problem is
when it is hot outside and driving for short distance like week end
shopping. After 3-4 stop/start situations car wouldn't start. I have seen
that if I hit the gas during startup it would start OK.

I am sure others also have experienced similar problem, any idea what
could be possibly wrong with the car. Just to add this car has passed the
emission test.

Thanks,

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John Henderson - 12 Dec 2006 20:15 GMT

> I am having problem with my Nissan Sentra GXE about 85k miles.
> Problem is when it is hot outside and driving for short
[quoted text clipped - 5 lines]
> idea what could be possibly wrong with the car. Just to add
> this car has passed the emission test.

I'm not sure exactly what you mean by "hit the gas". Nissan
recommended procedure for hot starting my Pulsar (probably same
engine) is to hold the pedal right to the floor until it
starts.

John

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Codifus - 12 Dec 2006 21:23 GMT

>>I am having problem with my Nissan Sentra GXE about 85k miles.
>>Problem is when it is hot outside and driving for short
[quoted text clipped - 12 lines]
>
> John

His Sentra is feul injected, so no need to hit the gas or floor the gas
pedal to start the car, cold or hot.

As for the issue,carnvperson, have you tried cleaning the throttle body?
Or maybe the idle air control valve needs adjustment. Clean the throttle
body 1st and see how it goes.

CD

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John Henderson - 13 Dec 2006 01:14 GMT

> His Sentra is feul injected, so no need to hit the gas or
> floor the gas pedal to start the car, cold or hot.

It's more complicated than that. Nissans like mine have smart
ECUs, which interpret the full-throttle start as an instruction
to adjust the total fuel quantity for hot-start conditions.
They electronically mimic the effect of holding the carby
butterfly wide open.

John

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codifus@optonline.net - 15 Dec 2006 13:04 GMT

> > His Sentra is feul injected, so no need to hit the gas or
> > floor the gas pedal to start the car, cold or hot.
[quoted text clipped - 6 lines]
>
> John

OK. I stand corrected.

CD

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max@dontspam.me - 16 Dec 2006 02:04 GMT

>> > His Sentra is feul injected, so no need to hit the gas or
>> > floor the gas pedal to start the car, cold or hot.
[quoted text clipped - 9 lines]
>
>CD

also, if you have a leaky injector, holding the pedal to the floor
will help burn off the excess fuel.

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175726@gmail.com - 29 Dec 2006 13:17 GMT

> Hi all,
>
[quoted text clipped - 8 lines]
>
> Thanks,

Trust me, I SPENT 1 YEAR trying to solve this same problem. I finally
traced it to a bad fuel pressure regulator. The diaphram had just
slightly cracked, so during cold weather everything was fine, when hot
weather came and it was driven a little i had to step on the gas pedal
to get gas going to the manifold because the diaphram in hot weather
was slightly letting go of the fuel pressure. Replaced the Fuel
Regulator, and now it starts on the 1st try every time. I found the
problem by checking the vacume of the fuel regulator and low and
behold, gas was comming up the tube when it should have been air!!!
Hope this helps...

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