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Why does dealership not want to clean throttle bodies?

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Old 06-27-2018, 02:41 PM
  #31  
saywat?
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according to the video its nots fully open at startup or low revs. its open smally. and with high revs it opens more and more. so its not a constant full open throttle. is that wat im understanding per video?
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Old 06-27-2018, 02:45 PM
  #32  
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oh wait never mind the opening wider part thats the other valve its referring huh lol
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Old 06-27-2018, 02:47 PM
  #33  
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Originally Posted by saywat? View Post
oh wait never mind the opening wider part thats the other valve its referring huh lol
From what I am seeing in the video it's open fully even with no foot on the gas pedal - probably meaning idle.

I have cleaned mine at 38k miles on my 2012 G37xS but they were clean and worked fine - it wasn't until my cleaning that I found out that it doesn't really matter.
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Old 06-27-2018, 03:42 PM
  #34  
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Originally Posted by si_driver View Post
I said it opens completely even at idle, how is that not 100% accurate?
Since with the new engine the throttle body stays fully open as soon as you start the engine
The more accurate statement would be "Since with the new engine the throttle bodies stay open most of the time."

"The TB does close when you lift off the accelerator. It opens when the throttle position is greater than about 13%. This keeps enough vacuum for the brake booster and for the mode $06 evap tests."

Source:
VVEL Question on Intake Manifold Pressure - Nissan 370Z Forum
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Old 06-27-2018, 04:14 PM
  #35  
Jsolo
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So cruising on a flat highway at say 70 mph in top gear (6mt) ~2500 rpm, how much throttle is being applied? I recall from my motorcycle days that most steady state operation was <15% throttle. It was only during acceleration that throttle was opened more.

Given what's in post #34 above, dirty tb's will affect idle and off idle throttle response.
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Old 06-28-2018, 04:37 PM
  #36  
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So if it's not throttle bodies, what causes the variable idle and/or the failed starts in cooler weather? I bought throttle body cleaner and was all ready to do this before my accident. Had been still planning on doing it once I get my car back.
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Old 06-28-2018, 04:39 PM
  #37  
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^ could be a vacuum leak
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Old 06-29-2018, 04:38 PM
  #38  
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Originally Posted by saywat? View Post
^ could be a vacuum leak
I suppose? I've seen several people post about it and the consensus had been that cleaning the throttle bodies resolves it. This thread is the first I've seen otherwise.

What would be other symptoms of a vacuum leak?
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Old 06-29-2018, 09:02 PM
  #39  
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the fluctuating idle at idle would be it that i know of.
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Old 07-01-2018, 08:48 PM
  #40  
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I did mine, I was nervous about ripping the boot. Watched a video on it, watched it several times. I believe I did disconnect the battery even though the you tuber didn't. I didn't take off the tb to clean the backside, I figure I will do that when I replace the plugs. I wish our cars engine covers were clipped in like the Lexus. Might just leave the thing off.

I cleaned the maf sensors, first time I did it, grabbed the screw and it dropped in the engine bay. Luckily I got it with a magnet. Being captain obvious here unclip the wire to your maf, loosen the screws and lift the whole thing out. That way you don't do what I did. I haven't had the problem when fastening them, so you are on your own.

If anyone is in Dana Point and needs some MAF cleaner, I have a whole can, you can use it, you can't have it.
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