Question about 1991 Nissan Sentra 2 Door

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91 nissan Sentra losses power at highway speeds

91 Sentra with 1600 engine and automatic trans. The car runs fine when cold. but when it is warm it will act like the key been shut off until the car slows down to around 35 mph. The problem at its worst at highway speeds. If I accelerate to 65-70 mph it will run fin for 30 seconds then lose all power until it coasts down to 35-40 mph. I can duplicate this at lower speeds by keeping the RPM over 3000rpm for a couple of minutes. the check engine light never comes on. I have replaced the fuel filter and fuel pump, checked fuel pressure, checked the various EGR valves.I have not pulled the EGR valve but I can hear it operate when tested with a vacuum pump. I have even replaced the computer, Oxygen sensor, temp sensor, spark plugs. Willing to retest

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  • Anonymous Jul 10, 2008

    MY NISSAN SENTRA CLASSIC 1991 WON'T PICK UP SPEED WHEN I STEP ON THE GAS PEDAL. WHAT SORT OF PROBLEM DO I HAVE?

  • gibson114 Nov 19, 2008

    I have a 1991 Nissan Sentra with similiar issues of which I have replaced the in-tank fuel pump, fuel filter, fuel pressure regulator, two new fuel injectors, three vacume lines, spark plugs. I performed fuel pressure tests using a fuel test gage while engine off with the ignition key on to engage fuel pump and, tested with engine running. Test results are as follows: New fuel pump pressure is at 40 lbs., Engine running fuel pressure with vacume hose attached to New fuel regulator reads 32 lbs., with hose connected to fuel regulator pressure reads at 39 pounds. I checked the EGR valve and it appears to be working...I hear it click when applied vacume. The car has the following drivablity issues: fluttering intermittant while diving at any speed, power loss at speeds ranging from 40 mph to 65 mph., The problem occurs at times however you can be driving along at highway speeds of 40 mhp or 55mph to 65 mph with absolutly no driving problems at all. No stumbling, no fluttering, no power loss no rough running at all and other times you wonder if the car is going to die. The check engine light has not at all came on. What should I be looking for? please help. I have a 1.6 liter 4 cylinder, twin cam 16 valve MPFI system, auto trans. car.



    Thanks!



    Gibson

  • Anonymous Apr 01, 2014

    The RPM's get really low around 500 and then engine just shuts off. Sometimes car just refuses to starts. Also I have a recently replaced fuel pump

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Just installed used engine in a 91 nissan sentra. my distributor and computer off old engine which was running but this engine will not hit what do i need to check for

Posted on Jan 10, 2009

NO, LIMPIA EL SENSOR DE AIRE, POR LO REGULAR SE LLENA DE GRASA EN LA VENTILACION, A VECES COMO QUE TIRA UN FALLO QUE QUISIERA APAGARSE, PERO ES ESO. PRUEBA CON UN CEPILLO DE DIENTES QUE NO TE SIRVA Y CON ESO LIMPIA EL SENSOR, SOLO QUITA LA TUBERIA PLASTICA Y DONDE EMPIEZA EL FULLINYECTION ALLI CEPILLAS CON UN LIMPIADOR.

Posted on Jul 01, 2008

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Remove the front 02sensor and drive the car like that, remove means complety take it apart from exaust, if problem goes away or gets so much better then your catalitic converter at the exaust is restricted and need a new one

Posted on Jun 19, 2008

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