3rd gen shaking.

[tmorales509]

Well i been trying to diagnose my cars shaking at idle problem for the last couple days. it shakes in park, alot more in gear but not really while driving. I did the pull each wire while the car is on and the #4 cylinder has no change when i remove the wire. So i changed the plugs, the wire(ngk wires), the fuel filter and the ignition rotor, pcv valve is farely new and looks clean still, i recently changed the o2 sensor as well a couple months back. My car still shakes after all that! No better no worse.

Next thing i did was check the resistance of each injector especially that #4 injector. These are the numbers i pulled. #1 injector 12.5, #2 injector 15.5, #3 injector 19, #4 injector 15.8, #5 injector 13 and #6 injector 15.2. The only one that looks farely different is the #3. Do those numbers look right? If so what else can be causing this, any other test i can do? I dont think i can change that injector myself and i hate to pay a arm and leg for a shop to do it..

[NutriaforBreakfast]

Just got back from Nissan
Paid 115$ at Courtesy Nissan to get a diagnoses of a bad fuel injector-cylinder 1- on mine

I would check the egr valve, canister evap, and maybe the fuel pump & regulator pressure too

Don't feel bad-lousy idle is the hardest thing to diagnose I think

You could probably change the injector if you did all that other diagnoses

[tmorales509]

thanks i have a list of things i have done since my first post at my house im not home now but ill reply in a few. how do i check the egr. when i push it up and down it seems to move freely without getting stuck or anything is that how i check it or is there another way. also how do i check the other things. thanks for th
e reply.

[tmorales509]

i cleaned the injector connections, cleaned the maf sensor, changed one of the vacuum lines it had a small leak. Ill try what you said tomorrow, if not then im just gonna get new injectors.

[audtatious]

You could move the #4 injector elsewhere and see if the problem follows the injector. Just a thought.

[tmorales509]

Well if i did that i might as well change them. You have to take out alot of stuff to get to the actual injectors. Upper and lower intake manifold, alll the hoses and connectors, replace all the gaskets..

[tmorales509]

Weirdest thing just happened. So im getting ready to take my car to autozone. I have it running while i look for a song..Then all of a sudden the shaking just stops and its running smooth now..Weird. I did put fuel injector cleaner in it though. maybe they were just dirty?

[tmorales509]

Nevermind, it started shaking again, lol. It does it off and on now, it will shake and then stop and then shake. I can even kinda feel it while im driving. Anyways im going to autozone. See if they can hook it up to the computer.

[tmorales509]

No error codes. Im just going to change the injectors, hopefully by next weekend i can have them changed and let you guys know how it turns out.