This is going out to anyone that would like to help me.
So i took my car into the shop because of a bad rattle that sounded like it was coming from my transmission or one of my belt pulleys, also because my car starts really rough (this got worse over the winter and im from canada so winters are pretty harsh here). My check engine light has been on but my car didnt run too bad considering it was on.

The mechanic at the shop and pulled codes po325 (knock sensor) and p1335 (crank position reference fault). They found that the knock sensor resistance was measuring too high (sensor fail) they said. Then they tested the circuit for crank position sensor, they removed components to gain access to ECM for tests they said, and they found an open circuit during testing and they repaired it. my crankshaft seal was also leaking so i told them to replace that.

So they replaced my knock sensor, i found out it was only my exhaust making the bad rattle. So i go to pick up my car and the engine light is gone, but now the car idles VERY rough, hesitates ALOT while accelerating, just seems like its not getting enough air you would think or maybe plugged injectors, i just replaced my plugs too and it didnt help at all, cleaned my air filter and it didnt help. im running injector cleaner through the car right now in hopes it will fix this problem.But before i did all that i took it back to the shop and they scanned it again and the crank position sensor said it was faulty. So before i go buy a crank position sensor or take my injectors out and clean them or completly disassemble and clean my throttle body, does anyone have a good answer for why this would be happening?

My car never used to run like this prior to having the codes cleared, always had steady pick up and pulled hard without any hesitating. at my wits end here. thanks.

 

I see you posted in the newbie thread and started this thread. In the future, please don't cross post.

Also, make your thread titles more descriptive.
https://maxima.org/forums/4th-genera...e-contest.html

To answer your question, it could be numerous things.

Start by inspecting and cleaning the crank sensor.
Then move on to the spark plugs (hopefully you installed NKG's)
Then move on to checking the coilpacks
Then injectors and FPR

 

Thanks for the reply, yeah i seen the newbie post after i made this thread, ill probably just end up deleting it because it got answered in the newbie thread. The crank position sensor is a little dirty but that doesn't effect the performance of the car i learned. Spark plugs are bosch plugs, so i guess the next thing to do is check injectors, and coils, my mechanic friend (not the guy from the shop) took it for a drive and figured it might be the transmission slipping. The car jerks and shifts rough sometimes but its worse now, when you punch it the revolutions rise but the car doesnt pull. Would you think thats a transmission issue?

 

Is your car a 5 speed, or an automatic?

 

Yup. If revolutions rise and the car doesn't want to go, that's typically a transmission issue. First thing to do is to check the transmission fluid level, and check it's color and smell. Hopefully it doesn't smell burnt.

The rough idle could be the Bosch plugs. Get NGK's in there...either the platinums or coppers.

 

i have been driving it for a little bit now, it doesnt really idle that rough anymore, but still has the slipping/hesitation issue. its a automatic transmission, i swapped the fluid in October 2015 but didnt drop the pan and change the filter. Im figuring i should change the filter to see if its plugged and if thats what is causing it to run rough.

 

I doubt it's the filter since it's just a screen really. Check your level and how it smells and report back.