engine stumbles

[diamonddave73]

my 240sx stumbles at 5000 rpms, i've changed the cap and rotor, plugs & wires, and reset the ecu. engine feels very strong otherwise it gets up and goes until 5000rpms! any suggestions would be very helpfull.

[240slider]

check your air filter

[leper421]

Stumbles how? Does it go past 5000?

[diamonddave73]

no not realy,it just stumbles.

[leper421]

You have to give more specific details.

My car had a problem where the engine would not go above ~5.5k rpms. Once it hit that speed, the engine would rapidly fluctuate between that and ~5k, shake violently, and have almost no power.

If thats whats happening to you, I may be able to help you

[diamonddave73]

that sounds about right, except for the violent shake. i've never realy tried to push it past 5000.

[p00t]

lemme guess you have a manual.

Does it do it in neutral as well? if so one of your gear position sensors are stuck.

unplug both of them or one at a time to find the culprit.

scroll down to my post, it shows where they are on your transmission.

http://www.nissaninfiniticlub....49434

NOTE: This doesnt apply to autotragics!

[leper421]

That was my problem, bad 5th gear sensor. It drove me nuts for months.

[diamonddave73]

it is a manual, and there is no problem in neutral, it revs past 5000 no problem.

[navysnail]

sounds like the rev limiter is coming on too soon and cutting fuel to the motor to prevent damage. check the OD sensor on the transmission

[p00t]

i thought the gear position sensor would be stuck even in neutral... hmmmm check it anyway

[navysnail]

check your sensors for continuity with a multimeter, easy to do and will tell you for shure if the sensor is good or bad.