i seem to be getting some really bad hesitation lately. 1st gear feels ok but once i get into 2nd and above it feels really laggy. sounds a little like its struggling. i am throwing a code for my o2 sensors but i have tp on the car and didnt think it would be a problem. any suggestions? could it be the plugs maybe? or should i buy some non foulers?

 

check vaccum leaks

CHECK what the code says...
o2 sensors testpipes code shoudl not cause the engine to behave liek this though

 

did check the codes...bad o2 bank and whatever. ive seen the codes before and they have been there the whold time with no problems. it feels like there is some misfiring. basically lately there is no power before 3k rpms. and im getting a bad gas/oil smell. damn i miss warranty.

 

bump

 

Do any really hard driving before this started? Have you had a compression test lately? How many miles are on the car?

 

90,XXX miles, its bad right from the start up. like when i take off from a light, (normal) it revs all slow and laggy... As far as a compression test, not lately. been a little broke and it sux. but as im driving if i punch it, i can feel it kind of bucking. very lightly but i can feel it.

 

check your hoses man... make sure you got no vaccum leak...
then also do a compresion test if all the rest checks out...

 

fuel injectors? my car felt like it had MAYBE 30hp. took me a few minutes to get to 20mph full throttle.

my fuel injectors were clogged. 19k miles. total crap.

 

Perhaps a bad batch of gas or fuel filter related.

 

How hard is it to change your own fuel filter?

 

I haven't had to replace the one on my car as of yet, but have done plenty on other vehicles. It's fairly simple though. A few hand tools and some rags.

 

and one of the O rings...(that rubber thingy) i did it on my spec V and didnt get one and had to ghetto rig it. it wont fit back after...

ill check the hoses and stuff. another thing is the car itself sounds a bit louder. like the intake and exhaust is more throaty for some reason. ( i have a popcharger, test pipes and a y pipe and its changed a good bit since installation ((and i know its not just breakin))) im just keeping my fingers crossed that there is a cheap way of taking care of this.

 

some cars use brass O-rings also. My old Eclipse did.
I think the noise thing might just be your mind playing tricks on you. I'd address the hesitation issue. Keep us posted.

 

no bad gas....filled up like 5-6 times since it started...

 

I'd hit that filter up then, especially with 90k miles on it....

Could be the plugs also, but I'd imagine the filter would be the lesser of 2 evils.

 

The fuel filter on VQ35 is a non-serviceable piece. It's built into the fuel pump. I suggest hooking the motor up to a vacuum gauge to verify you don't have a vacuum leak. It's a simple and cheap test.

 

Good info to know. I was unaware of this, being I've never had to pull the pump or filter on the Z as of yet.

 

+1 good call... i have been talling him already i have a feeling it could be a vaccum leak

 

trust me...i hope its as easy as just a hose. after 90k should i be replacing hoses anyways? im throwin new plugs in there anyways just for S & G. and the noise thing is not just me tho...my girl noticed it too. (before i said anything to her.)