Question about 1997 Nissan Sentra

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1997 Nissan Sentra 4 cyl. Won't Start

My daughter drover her 97 Nissan Sentra home last night, parked it, and in the morining would not start at all.

I put new plugs in, and checked the Spark. It has great spark.

It is flooding out terribly, even when only cranked over a few times. It's flooding so bad if you crank it much, you can see fuel on the top of the pistons!

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  • Roger Leischner Oct 18, 2008

    Not sure the fuel pump or injectors would be the problem here ... a fuel pump would most likely not deliver ANY fuel. Is there a pressure regulator?

  • Roger Leischner Oct 18, 2008

    No, no. It is getting WAY too MUCH fuel. If the pump is blocked, it would get NO fuel ...

  • Roger Leischner Oct 18, 2008

    What about the coolant temp sensor? Is there a way to test it? Would it put out an OB Code? I read that when failed, it will put out -127 Deg., and tell the fuel injection to really blast. Anybody know?

  • Anonymous Mar 13, 2014

    no spark at plugs

  • Anonymous Mar 23, 2014

    Lp help help

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You do not have a fuel pump, fuel pressure regulator, or other fuel-related issue.
What you have, in fact, is an issue with the fuel injectors. All 4 injectors get constant power, and the ECU provides a pulsed ground circuit (in milliseconds) to energize the injector (the ground completes the circuit, pulls the electromagnet open to let the fuel spray). If the ground circuit is constant, as in your case, you will have the injectors spraying all of the time, as you have described seeing fuel on the tops of the pistons. This can only be caused by these 2 factors: either you have a chafed injector ground wire shorting that wire to a ground on the engine, or a bad ECU.

Posted on Oct 18, 2008

  • Toyota Ed Oct 18, 2008

    The coolant temp sensor will read -40 maximum

  • Toyota Ed Oct 18, 2008

    The coolant temp sensor would not be the problem, at -40, you only get 12-14 milliseconds max of fuel pulse per eng RPM. That is nowhere near enough pulse to "see fuel" as you have described. Try this: Remove all of the plugs. Remove the coil wire. Turn the key on. Do not crank the engine. Observe the tops of the pistons...if fuel starts to begin to run out of the spark plug holes, my initial observation is validated.

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May be the pump is being blocked in some way???????

Posted on Oct 18, 2008

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That means bad injectors, or defective fuel pump, you probably need to replace the fuel pump.

Posted on Oct 18, 2008

  • Ginko
    Ginko Oct 18, 2008

    The fuel pump has a pressure safety valve, that is released when fuel pressure is excessive, if that is stuck, the pump will deliver fuel with eccessive pressure, sure that is not enough to flood cylinders with fuel, as you must also have a problem with valves or injectors, or you must spend some time trying to crank with no spark.

    Let the fuel dry up completely, try starting again with new spark plugs, if it floods immediately it is an injection problem, if it fllods after a while because there is no spark, then it is a distribution problem (rotor, electronic distribution).


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I think sumbudy put sumthing in the car silencer put it out ...

Posted on Oct 18, 2008

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Have a compression check.. may be the problem is on the pump.. stop for a while.. remove all the plugs.. then restart it after sometime!! .it might work out!!

Posted on Oct 18, 2008

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It sounds like the pump is fine.Its certainly pushing enough fuel if it can overcome the resistance created by the injectors.I guess if too much pressure that the pressure regulator is not working to spec or your fuel return line has a blockage.The fuel pressure regulator is usually located at the end of the fuel rail.The pressure reg allows excess pressure to return to the fuel tank.Another thing to consider but not as sudden as you describe is dirty or unservicable injectors.A bottle of injector cleaner in the fuel tank wouldnt hurt next service

Posted on Oct 18, 2008

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  • tony yeatman
    tony yeatman Oct 18, 2008

    If your pressure relief is the vacuum type make sure that it is operating if you cant start engine you will need a pressure pump to apply enough vacuum to overcome the spring loaded mechanism inside the PRValve.

  • tony yeatman
    tony yeatman Oct 18, 2008

    If no joy after doing that test I would agree with toyotas diagnosis

  • tony yeatman
    tony yeatman Oct 18, 2008

    If the test i have described is carried out it is the one test that eliminates having to do all the others as it covers every answer given in respect to the fuel system except toyotas

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