sr20boston

I found that after cleaning my throttle body, my idle speed was no longer adjusted properly. I'm not sure why that was, but you might want to check yours after doing this.

You will first need to remove the large hose going from the intake to the throttle body. (The Intake is where your air filter is.) There will be a large clamp at each end of this hose, and another near the intake, these can be loosened with a phillips screwdriver. There is a vaccum hose near the throttle body that must be removed from the hose, and there are also two other hoses that need removing from this one. Use a pliers to spread the clamps, and work the hoses loose. Once the two end clamps are loosened and the other three hoses removed, remove this hose assembly.

You now have access to the throttle body. Take a broom stick and use this to push the gas pedal to the floor, keeping the throttle wide open. If you can find Throttle Body Cleaner, use this, but Carb cleaner can work too. Just hold onto that little straw to keep it from flying into your engine! Since the cans normally don't spray well upside down, I managed to lower the can down between some hoses and get it at a good spraying angle. Soak the throttle body well, then use an old toothbrush to brush against any metal surface you can reach. You'll find the brush will quickly turn black. Spray in more cleaner, and keep brushing. This may take a while. Get as far in with the brush as you can, but again, be very careful not to let the brush drop into the engine!

When you're done, fire up the engine, and spray a final burst of cleaner into the throttle body. Ignore the white smoke pouring out of your tailpipe, it will go away once you have the hose reattached to the throttle body. Shut down the engine, reinstall the hose, and you're all set!

This procedure should probably be done once a year as part of your spring tune-up ritual.

Source: Jim Wright

 

~KnuckleDuster~

when i tried doing this the only way to keep the car from stalling was to open it up full throttle, and running thje car at 7 thousand rpm while i take a few min to spray the whole can inside didnt seem right with me. am i doing somthing wrong or do you really have to put the pedal to the medal for that long? i did manage to shoot some of the tb cleaner inside and noticed black ooze comming from my tailpipe

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Red200Se-R

you dont do this while the engine is running

Gunma420

also make sure you connect the little vacuum hose back into the intake "pipe" or hose.

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~KnuckleDuster~

he makes it sound like you have the engine running when he talks about keeping the straw from flying into the engine thats why it sounded like the engine had to be on, my bad ill try it again

da_linkwent

I got the impression that the engine has to be running for the final spray.

"When you're done, fire up the engine, and spray a final burst of cleaner into the throttle body. Ignore the white smoke pouring out of your tailpipe, it will go away once you have the hose reattached to the throttle body. Shut down the engine, reinstall the hose, and you're all set!"

Anyway I did it and it felt good for a while now I'm faced with another problem. The # 4 injector wont click. I disconnected it and there was not notice in power and now the car back fires like the wild west. What must i do now?
How do i check the injector harness to see if it is sending any signal to the injectors?

~KnuckleDuster~

When i finished mine my car was flodded so i had to wait like 30 min for it to flush out, but after that it ran great

Pretty White

Your idle got messed up because throttle body cleaner got in the IAVC hose under the T/B. I learned to remove that hose and clean out that hole with the hose attached to the T/B and reverse spray thru it. Re attach it when you think all the T/B cleaner has evaporated.

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da_linkwent

Strange enough the stupid thing start working OK this morning. Someone was telling me that the FICD (I think thats what it is) and some other mechanism might be clogged so I plan on pulling the entire thing apart and clean it out thoroughly. One thing I also observed after the clean is that my rmp wont go below 850. No matter how i adjusted the screw (it usually go below that). So maybe thats blocked too. Any tips on how to dismantle this thing?

keV

Nice writeup. I did everything except the last step, "...fire up the engine, and spray a final burst of cleaner into the throttle body." No white smoke for me, and my idle is OK too.

Throttle body cleaning and a new fuel filter make a noticeable difference for me My car had a slight hesitation, and is much smoother now. On another note, ALWAYS use nissan fuel filters and never use a fram fuel filter *duh* The top of my fram fuel filter broke off and was left in my hose. I had to shorten the hose to get the piece out. The OEM Nissan fuel filter is all metal, where the fram had plastic pieces that went into the hose.

da_linkwent

Ok guys, this is it. I pull the entire injectors and FICD and give it a damn good clean (shine & nice). However now the throttle is racing like crazy. I adjust the timing and the idle (not in the exact order) and it wont go below 1000rmp. So I decided to give a run and then try and adjust the idle again. I am open to any advise.

P.s. I read all the post and have done all that they say and still bad idle.

Pretty White

Did any of you read my post? The way I posted will prevent any idle surging. Please do that one little hose removal to avoid high idle. It takes 2 minutes tops to find it and remove it. 30 seconds to reinstall once you know it is there.

da_linkwent

Where exactly is that hose? and what is IAVC, is it the same thing as the air regulator?