Question about 2001 Nissan Sentra

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2001 sentra SE Bogs Down, things I've done:

After I checked all the plugs and all the coils on every cylinder and swapped the coils out one after another with known good one. 1. Tested fuel line pressure, no problems. 2, Pumped out all the gas and used clean fuel, no joy 3. Swapped out MAF with known good unit, no joy 4. Removed fuel pump to check if it filter was plugged and pump was ok, no problem 5. Removed ECU shipped to AutoECU for repair, tested and road tested on a car, ecu is fine 6. Swapped out transmission control unit with known good unit, no joy. I've also changed the valve cover gasket because it was leaking and dripping on the hot manifold. The car starts and runs fine when cold, starts to bog down when its warmed up or when it goes into gear. I have a OBDII reader the original codes it showed were transmission related. It is not showing any trouble codes even when I drive it around the block and it stalls completely and I restart it and limp it back to my garage. The dealer estimates it will take several hours to trouble shoot, while it's a good car it's not worth spending a $1,000 or more to find the problem. I' stumped. Any suggestions

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  • Nissan Master
  • 3,103 Answers

Some have an egr valve thats operated by hot antifreeze which runs through the base of the tbi unit and sometimes these gaskets fail and cause this condition..it also affects the vacuum system too check to se if yours is equiped with these and repost...

Posted on Jan 21, 2013

  • 1 more comment 
  • Harm Woldring Jan 24, 2013

    I haven't had time to check. I will try to get to it on the weekend. Will let you know.

  • Harm Woldring Feb 08, 2013

    OK, sorry for the long delay, Ihave checked the EGR, this is definetley where the problem lies but it appears to be electrical. Things we did: 1) disconnected cable, car ran better but not great, had acceleration but rev limiter cut in. 2) put a plate in to block the hole leading from EGR to manifold, same thing ran better not great, 3)swapped out the EGR with a known good unit from my other 2001 Sentra, no improvement, redid 1 & 2 same results also switched out sensors with no effect. We conclude that there must be a signal issue from EGR to EMU. Any advice?

  • Jerome Minks
    Jerome Minks Feb 09, 2013

    try this..disconnect the battery negative with the key in the run position..once done, turn the key off and reconnect the battery negative..then turn the key to run position for a few seconds...this resets the factory presets in the computer and may reset the system... repost findings

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SOURCE: 91 nissan Sentra losses power at highway speeds

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

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SOURCE: 95 maxima rough idle

The injector could definitely trigger a misfire code, but you also mentioned that you had a mass airflow sensor code , that code code be responsible for te sluggish moment of the vehicle and rpm going up and down. However if you have a misfire onCyl#6 and the coil and the plug is good the ONLY other thing to cause a mis-fire would be the injector. To check the injector get a NOID light, you can get one at almost any auto-parts place. To use unplug injector plug from the bad injector and connect it to NOID light the light should have a steady PULSE/ligt flickering. If light flickers fine then injector is bad and will need to be replaced. If light doesn't flicker or flickers intermittently then you may have a bad wiring to that injector. Check if wiring is good, then you may have a bad cam sensor or sensor gear. Good Luck and contact if you need more help. Thanks for using FIX YA

Posted on Jan 13, 2009

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SOURCE: 2001 nissan altima code says cylinder 1 miss fire.

a lot of people have reported this issue with the 2001 Nissan altima. it is a design flaw and the idle rpm fluctuation is caused by a bad intake manifold gasket. the part only costs about 10 dollars but do to the 5-10 hours it takes to replace it is a very costly on the labor side

Posted on Feb 05, 2010

SOURCE: My 1986 Nissan 300zx non-turbo was running fine,

It sounds like the number 2 injector is hung open.

It will dump fuel and cause all sorts off issues with the ECU.

You should ohm that injector and compare it with the others to see if it is wildly different. If so, change it out and retest.

Posted on Jun 27, 2010

mcdevito75
  • 1970 Answers

SOURCE: 2001 Nissan Sentra idling and running issues

mcdevito75 here, I woild bring the car to an auto electrical shop and have them check out the entire electrical system.

Posted on Jul 09, 2010

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since these are coil over plug, wires are out of the question, but not the coils. Although on this model, it would hard to test out since u need to remove the intake to get to the coils. But if it\'s been running like that a while, you should probably have a check engine with a code stating a cylinder misfire. If so, check if it\'s a specific cylinder, or a random cylinder misfire. If it\'s specific, you can swap 2 coils for one another and see if the misfire changes cylinder. if so, then you will know which coil is shot. If it\'s specific but changing the coils for one another doesnt change the cylinder misfiring, then the injectors are probably problematic. You can test that theory in the same way you did with the coils, but be sure to empty the pressure in the injection line before taking an injector out, or else you\'ll have a huge mess on your hands. If it\'s random misfire, then that will be a bit harder to pinpoint. You\'ll need to check for air leaks due to damaged/worn gaskets or vacuum hoses, check for fuel leaks from the injectors due to bad o-rings. If all else fails, just write back with what you\'ve tested and i\'ll try to help you find the problem.

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