Question about 2001 Nissan Sentra
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
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
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Posted on Jan 02, 2017
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
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
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
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
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