TB Cleaning

[blackgove]

Throttle Body cleaning on 2005 Fx 35

You need:
10mm socket
5/16 socket
3/16 hex bit
TB Gasket (16175-AR000)
Carb cleaner




1) Remove the engine cover
2) Remove the air duct 2 clip, one bolt, one hose


3) Remove the TB 4 hex bolt. All bolt are the same no need the remember position. 1 electrical connection.

4) Clean TB with carb cleaner and a light brush (tooth brush)
5) Clean the intake since you got access


6) Clean the area where the gasket seat
7) Put back gasket and TB torq the 4 bolt in a clockwise patern to make sure the gasket seal. Don't forget to reconnect the TB wire.
8)Put back the intake duct
9) Start the engine and spray some carb cleaner one the TB gasket. Nothing should happen if the engine drop rpm thats mean the gasket don't seal right.
10) put back engine cover and Voila!

 

[Dr.2K]

Thanks for the write up! But don't you need to reprogram the TB with the pedal procedure after this cleaning process?

 

[StuLax18]

Thanks for the write up! But don't you need to reprogram the TB with the pedal procedure after this cleaning process?

Most likely, yes. I thought I was pretty careful, and I needed to.

 

[Dr.2K]

Stu can you post the pedal reprogramming procedure here for reference just in case someone may need it. Thanks.

 

[StuLax18]

Here is the link for all the resets. ///799

 

[Bklynjohn718]

Nice writeup.

 

[blackgove]

I did not need to reprogram. My TB was not really dirty but I was experiencing stubble at idle. So far everything is back to normal

 

[tchuck]

Mine was filthy last time I cleaned it and I didn't have to reprogram. I ended up doing it anyway a few days later, but it didn't make any difference. I also used a light cloth instead of a toothbrush, fwiw.

Here are some pics from the first time I cleaned it, after which I did the pedal dance calibrations...

Throttle Body - air filter side - BEFORE



Throttle Body - engine side - BEFORE



Throttle Body - filter side - AFTER (I forgot to take a pic of the engine side after but it looks just like the filter side.)



Lower plenum - BEFORE



Lower plenum - detail - BEFORE



Lower plenum - AFTER



Upper plenum - BEFORE



Upper plenum - BEFORE & AFTER



Upper plenum - AFTER



Upper plenum - detail - AFTER

 

[pmanliu]

Great write up.

A step or reminder you might want to add is to be careful not to drop the gasket when separating the TB from the upper plenum

 

[turbocad6]

you can def do a better job by removing the throttle body & it is the better way to do it if you have the time but it's not absolutely necessary, you can effectively clean it without removing it too, especially if your going to clean it every 20k miles or so, can be a 15 minute job

re-calibrating it becomes necessary only if you open the throttle & then let it snap closed on it's own spring pressure. letting it snap closed even a little can knock it out of calibration. there is a variable resistor connected to the throttle plate (tps sensor) & the computer is calibrated to it's precise resting position. letting it snap closed can change this precise calibrated resting position just a little... no damage done but the computer would then need to re learn it's exact resting position again... as long as you gently close it without it snapping closed you'll be fine & not have to relearn anything, simple as that really...

 

[blackgove]

 

[Viperi]

Mine was filthy last time I cleaned it and I didn't have to reprogram. I ended up doing it anyway a few days later, but it didn't make any difference. I also used a light cloth instead of a toothbrush, fwiw.

Here are some pics from the first time I cleaned it, after which I did the pedal dance calibrations...

What did you clean the upper and lower plenium with? a rag and carb cleaner?

 

[bleedingsujit]

What did you clean the upper and lower plenium with? a rag and carb cleaner?

a microfiber rag is the best way to go. this procedure requires some patience. do not let the throttle snap.

 

[tchuck]

What did you clean the upper and lower plenium with? a rag and carb cleaner?

I used this:


and these:

for the upper and lower plenum as well as the TB. The TB cleaner does 80% of the work. Very little scrubbing is required.

I opted for disposable shop towels instead of a rag because they're cheap and my wife would have spontaneously combusted had I run motor oil soaked rags through our washer and dryer.

 

[zlayer]

I dont know if the plenum will flow any better after the cleaning, but it's a lot purdier! Might as well do this too.

 

[Dracula]

Do i need new gaskets for this job?

 

[tchuck]

Do i need new gaskets for this job?

Not unless yours are damaged somehow. I've done it a few times and never needed new gaskets.

SfmDRuT2

 

[Dracula]

Not unless yours are damaged somehow. I've done it a few times and never needed new gaskets.

SfmDRuT2

Thanks, lost a snap on socket right by the throttle body, i dont know where it fell, right under the intake tube and tb there is an openin by the plenum engine area , hopefully ill find it one day. Expensive snap on 10mm deep socket

 

[tchuck]

Thanks, lost a snap on socket right by the throttle body, i dont know where it fell, right under the intake tube and tb there is an openin by the plenum engine area , hopefully ill find it one day. Expensive snap on 10mm deep socket

I bet its sitting atop the front cross member. I lost one there while installing my headers. A couple weeks later I was removing my hfc's and found it.

 

[tchuck]

Whoa. Check this one out:
.

.

.
I thought the high idle was part of the tune... :what:

SfmDRuT2