Its been about a week or so that my car's throttle reponse has decreased and it doesn't pull as hard as before. My intake is dirty and im changing the filter very soon. What else could cause this?
I haven't cleaned the throttle body at all since i have had my car (now i got 67k on it). Can a dirty throttle body/intake cause this or there is something more serious than this?

One more minor issue is when i sart the car, it takes longer than usual for the car to start. The starter spins extra second or two before the car turns on. What kind of issues am i facing?

 

i had the throttle body cleaned and the throttle response improved greatly. did it at 58k miles.

 

I cleaned out my filter after 22k miles for the first time, and my throttle response improved. Gas pedal was alot quicker to react, especially in the mid-rpm's.

I was about to clean the MAF sensor but I didnt have the appropriate materials to do so. But im sure after 67k miles on it, it can't hurt (if you do it without damaging it).

I haven't bothered cleaning my throttle body since I don't think its an issue for me at 22k

 

Hopefully this will resolve my issue as well.

 

if you can do it yourself, more power to you but i took it to the nissan dealer to get it done (your favorite place in the whole world!) a lot cheaper than infiniti dealer.

 

I'll do it myself to take off evert single dirt out of it. There is a nice DYI video somewhere, i'll just follow that.

 

OKay i just cleaned everything including the throttle body/maf sensor/new filter and here is what happened. Car starts the way its suppose to. The car still feels like its ***** have been cut off. I suspect that this is caused by very bad gas...... I don't see any other explanation to this mystery. It feels like a stock car and i now realize how much faster my car was...... Im gonna waste all the gas today and fill up where i usually fill up and see what happens. I know my tune is still there because the rev limiter is at 7100 and in valet mode the engine still cuts off at 4k rpm.

BTW throttle body was so fvckin dirty.

 

We have seen some issues this year with people transitioning to winter gas in SoCal and seeing changed performance (I don't know if the blends have changed this year), but nothing quite like what you're describing.

If you can't wait until the dyno day, come by so we can at least put in on the dyno and see if it is a power issue or a throttle issue.

SC

 

Thanks Shawn. Im gonna drive and empty my tank today and fill up at a familiar gas station and put BG44k in it. Hopefully this will resolve everything.
Keep in mind this is not a minor power loss, I can feel how lazy RPMs climb even in 1st gear.

 

I hate the way this car drives now. I can't wait to empty the sh!tty gas. Pointless driving is a must today.

Just now i drove it to get lunch and the car almost bogs every 700 rpm throughout the powerband. Its horrible!

 

Time for some race gas to repay you for the sh!tty previous gas

 

i didn't realize gas would make such a huge difference.

 

Not sure if its the gas, but i really hope it is. The engine has no knock whatsoever even under WOT....... I really think i am slower than a stock G right now.

 

I might do that along with BG44k.....

 

Does your car idle rough? Try replacing your PCV valve. Mine used to idle rough and bogged a lot. I am not saying that should resove it, but have the the ecu scanned for codes and listen to the PCV valve for air leaks. It cost me $50 and was a piece of cake to replace. Here is the link on how to replace your PCV valve in case you decide to do it http://www.wonderhowto.com/how-to/vi...5-263050/view/
Hope this helps