I have a 2006 350 revup 6spd with the aps single turbo kit. Some time ago, a little too much oil was put in the car by mistake and the cam sensors and crank position sensor apparently went bad. The car would crank, and run for a moment, but then the rpm needle would jump up and down like crazy reving up and down, like I was touching the gas pedal myself but I wasnt, and if I tried to rev it up, the rpms would just go up and down and it would stop at and certain point and just sputter and backfire like launch control or something, and then eventually stall and die. After a short wait, the car would crank back up, but if I tried to restart it immediately after it stalled, it would make that same sputtering, backfiring launch control type noise when I kept the key turned but it would not turn over, just kept sputtering and backfiring. While trying my best to make the car drive, it would just jerk violently back and forth, along with the same crazy rpm activity from the needle which did not coincide with the actual rpms of the motor, and would without fail stall after a moment and die. I replaced the cam sensors that were bad with oem sensors and the crank position sensor with an autozone one because that's all that was available at the time. The car still would not work. However, when you unplug the crank position sensor, the car would take a long time to turn over, but it would, and would even run and drive. There was no boost, and if you tried to give it any serious gas it would hit a fuel cut and even with the pedal mashed all the way down, the rpms would continue to fall, and only once I let off the gas for a moment and then resumed throttling would the car begin to accelerate again. It ran, but not well at all. No power and unless feathered just right while driving, shifting at 3k or below, Otherwise hello fuel cut And bog down. I changed the oil, went to nissan and bought an oem sensor, as I heard the parts store sensors were crap. I paid 150 dollars, non refundable, for this new crank position sensor, installed it, and did an ecu reset with the pedal twice for good measure, and it did not fix the problem at all. The same exact stuff is occurring. I checked the codes and the codes showing up are p0335 twice, p1078 twice, and p1084 twice. These are the same codes ive been having. does anyone know how to fix this? thank you in advance for any advice.

 

Car revving by itself? How high is it revving on it's own?

How many quarts of oil too much was put in?

 

Sounds like a sensor somewhere fooling the ECM into "limp home mode" or some other "protected state".

 

Thanks for the replies, a quart or two too much, and its reving up to 2k and back down. The limp mode theory sounds like the right direction. I have searched all over for an answer to turn limp mode off and clear it out, nobody seems to know. There has to be a way to turn it off.

 

Did you try full ECU reset? (pull batt + and step on brake pedal for a minute)?

 

i have done the pedal procedure ecu resets (all of them) and done the hard reset where i pull the battery cables and drain with the brake pedal. Nothing changes. I am about to take a video of the car and post

 

Here is the video. Note that I am reving it to show that it is running fine until the shenanigans start at 2:14 into the video, and it eventually stalls and turns off, every time, especially if I try to drive it. Also note that after 2:14, when the revs go down, i am not allowing that, i still have my foot on the gas and it should be continuing to rise in revs but the car throws it back down and makes the noise. Somebody please help

 

Somebody??

 

???

 

Try asking on My350Z.

They're a little more 'involved' on these things.

 

I already did, getting some response but not much. This site is as involved as my350z, they are the same car and will have the same solution

 

I had the same problem in my altima a couple years ago. It is the crankshaft position sensor. The sensor costs about $15-$20, its a bitch getting to though. Replace that and you should be all good.

 

Nissan uses a plastic senor, the replacement one i bought at autozone was stainless and i never had a problem with it again.

 

What codes are you throwing? Check for vacuum leaks yet?