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Alright let me go through this... I don't really take apart much in my car other than the doors for the power windows... but i really want to clean out the throttle body. Everyone makes it sound so simple on this forum and searches come up with pieces of info but no complete walkthrough or anything. I did however find this:
Quote:
5S-FE Engine
Turn the ignition key to the OFF position. Disconnect the negative battery cable.
Fig. 2: Exploded view of the throttle body and related components — 5S-FE engine
Drain the engine coolant.
Disconnect the accelerator cable from the throttle linkage. If equipped with automatic transmission, disconnect the throttle cable from the linkage.
Remove the air cleaner cap, resonator and hose.
On 1995–96 models, remove the alternator and distributor. Then separate the front exhaust pipe from the catalytic converter and Remove the water outlet and bypass pipe.
On 1992–94 models, disconnect the Throttle Position Sensor and ISC valve wiring.
Label and disconnect the PCV and vacuum hoses from the throttle body.
Remove the retaining bolts holding the throttle body; remove the throttle body and its gasket.
Remove the coolant by-pass hoses and air hose after the throttle body is partially removed.
Clean the cast parts of the throttle body using a bristle brush and carburetor cleaner. Do not expose the throttle position sensor or other external components to the solvent. Use compressed air to clean and dry all passages in the throttle body.
If the throttle position sensor is to be replaced:
Remove the mounting screws and extract the sensor.
Make certain the throttle plate is fully closed. Place the sensor onto the throttle body so that the electrical connector is positioned properly.
Temporarily install the retaining screws for the sensor.
Adjust the throttle position sensor.
Installation is the reverse of removal. Place a new gasket on the intake manifold. The gasket is correctly installed in only one position: the protrusion or bulge in the gasket must face downward. Install the throttle body, tightening the retaining nuts and bolts to 14 ft. lbs. (19 Nm).
NOTE: The bolts must be installed correctly; the upper bolts are shorter than the lowers.
Refill the cooling system. Start the engine, check for operation and top off the coolant level.
three things I noticed that I did not see elsewhere on the forum were:
1. Draining the engine coolant.
So is this required? I don't really want to have to go through it it seems to be a pain.
2. replace the intake gasket.
In the online manual i found this in (btw it's a credible library source) it says that the gasket is not reusable and you are to replace it with a new one. Do I need to? if so, where do I get it?
3. Disconnect the battery terminal
not that it's hard or a big deal but i've never seen anyone mention it for this task.. questions? comments?
As I'm removing this, am I going to run into suprises? is there anything I should know about the pcv hose or any other hoses? is recalibrating the throttle hard? Should I spray seafoam into the intake (I think that's what it is.. connects to gasket and throttle?) as well?
Sorry for all the questions I really did try once again to search. Thanks for answers
you can just discconect the intake hose to the TB and just spray carb cleaner in there. and use a tootbrush. you don't have to take the whole TB out of the car to clean it.
yes but from the posts i've read it sounds best to just take the whole thing off... for that really good clean... and especially since I've never done it.
oh and I should definitely clean it with the engine off AND spray it in there with the engine running right?
no idea why you want to drain coolant?
i did remove the trottle body and used a toothbrush and a STP trottle body cleaner. You can use a brake cleaner or other oil/grease cleaners.
I did not replace the gasket, advisable but i did not.
As for disconnection the batt terminal, it's in all Haynes Manual. I think it is a Cover your Ass from lawsuits. Good habit to do but have to reprog the clock, radio.
Also prevent accidental starts by somebody else. My mom/pops friend mechanic lost 3 fingers cos some @sshole started the engine while he was working on it.
no idea why you want to drain coolant?
i did remove the trottle body and used a toothbrush and a STP trottle body cleaner. You can use a brake cleaner or other oil/grease cleaners.
I did not replace the gasket, advisable but i did not.
As for disconnection the batt terminal, it's in all Haynes Manual. I think it is a Cover your Ass from lawsuits. Good habit to do but have to reprog the clock, radio.
Also prevent accidental starts by somebody else. My mom/pops friend mechanic lost 3 fingers cos some @sshole started the engine while he was working on it.
I would not use brake cleaner or any other cleaners that aren't intended for the inside of your air/fuel system. Any cleaner used for internal parts must be able to be combusted by the engine and be O2 sensor safe. Brake clean is definitely not. Use only throttle body cleaners or carb cleaners that say they are "oxygen sensor safe".
you are suggested to drain coolant as tehre is a coolant line that runs to the TB and the EGR, but you can disconnect these and not lose any coolant usually, just be aware that it's there. You can clean the plenum a lot better if you've got the TB off, but if you don't feel like it you don't have to take it off. You can probably get away with reusing the gasket, just be very careful not to pry at it or anything to tear it, because if you do you'll be needing a new one
I would not use brake cleaner or any other cleaners that aren't intended for the inside of your air/fuel system. Any cleaner used for internal parts must be able to be combusted by the engine and be O2 sensor safe. Brake clean is definitely not. Use only throttle body cleaners or carb cleaners that say they are "oxygen sensor safe".
Mike
See where your are coming from Mike.
Brake cleaner is OK as long as you take out the body and then wipe is clean.
hey all. can anyone tell me the difference between cleannig a throttle body and adjusting one?
and also, does cleaning it really affect the car that much? essentially, you are just taking a layer of gunk off the body but does that gunk really interfere with the air that goes through? i'm really not a fan of ripping my engine apart to clean it and i'm just wondering if its that important.
..sorry for sounding like a noob.
I want to clean the TB on my 'clipse, but for that I have to disconnect the battery. I despise doing this since my car drives like shit for a day or 2 because then the computer gets reset.
I want to clean the TB on my 'clipse, but for that I have to disconnect the battery. I despise doing this since my car drives like shit for a day or 2 because then the computer gets reset.
Most auto parts stores sell a device you can plug in to your cigarette lighter to retain the ECU and the radio memory when you disconnect the battery. The other end is simply a 9 volt battery connector. You plug a 9 volt battery in and then plug the other end in to your lighter; then you disconnect the battery. I think they run around $6-$7 here.
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