How To Clean Throttle Body And Iac Valve

sampathapg · January 30, 2014

My Car is TOYOTA Corolla AE110 (XE Saloon / 1998 / Auto / Petrol)

Recently my car has started to vibrate when in idle.

All engine mounts are OK,

ATF oil, Engine oil and air filter ok.

recently scanned by Mr. Dhammika Fernando (Cotta Road), He said all are ok.

but sometimes my car is vibrating when in idle.

I think the problem is on fuel filter (I didn't check it recently) or IAC valve or throtle body.

Dear friends, Is fuel filter cause for this issue?

I am planning to clean the throttle body and IAC valve.

I need your valuable advises to do this job by my self.

What is the proper way to clean this?

What are Chemicals used for it? (Please mention the brand and price)

I heard professional peoples are using a silicon grease or something to sealed up the gaskets and joints, What is that compound?
Where can I buy it?

What are the safe actions in this process?

Please help me. Thanks.

Edited January 30, 2014 by sampathapg

The Don · January 30, 2014

Is the car in gear when it starts to vibrate when idle?

Davy · January 30, 2014

How to clean the ICV valve was already shared:
http://forum.autolanka.com/topic/9744-cleaning-the-iac-valve-and-a-basic-engine-cleanup/

sampathapg · January 30, 2014

Is the car in gear when it starts to vibrate when idle?

My car is auto transmission, when the gear in "N" position and "P" position it's vibrating.

When I shift the gear to "D" or "R" it also vibrating.

But drive in little higher speed (15kmph) it dose not happen.

Edited January 30, 2014 by sampathapg

sampathapg · January 30, 2014

Is there a Mass Airflow Sensor (MAF) in Corolla AE110 1998 Model?

or,

It has Manifold Absolute Pressure sensor (MAP sensor)?

How to clean it?

Edited January 30, 2014 by sampathapg

The Don · January 30, 2014

Sampath, please stick to standard fonts. It's quite annoying.

You should be quite careful cleaning MAF or MAP sensors as they are sensitive electronic components and will get damaged by strong solvents like carb cleaner.

My advice is if you don't know if these things exist or where they are best take it to a professional. Finding these parts if you damage them is becoming more difficult as time goes on.

When vibrating what is the current rpm of the engine (if you have a rpm meter)?

sampathapg · January 30, 2014

Sampath, please stick to standard fonts. It's quite annoying.
You should be quite careful cleaning MAF or MAP sensors as they are sensitive electronic components and will get damaged by strong solvents like carb cleaner.

My advice is if you don't know if these things exist or where they are best take it to a professional. Finding these parts if you damage them is becoming more difficult as time goes on.

When vibrating what is the current rpm of the engine (if you have a rpm meter)?

There is no RPM meter, But Mr.Dhammika said it's about 700RPM in idle. But that time car wasn't vibrate.

Sylvi · January 30, 2014

There is no RPM meter, But Mr.Dhammika said it's about 700RPM in idle. But that time car wasn't vibrate.

Go back to Mr.Dhammika and say that you are not satisfied. Request his answer for your problem.

Listen to "The Don" the moderator's advice. Do not meddle with electronic components.

If you are not satisfied, try the agents will give you the best advise.

Sylvi Wijesinghe.

sampathapg · January 31, 2014

My Car is TOYOTA Corolla AE110 (XE Saloon / 1998 / Auto / Petrol)
Recently my car has started to vibrate when in idle.

All engine mounts are OK,

ATF oil, Engine oil and air filter ok.

recently scanned by Mr. Dhammika Fernando (Cotta Road), He said all are ok.

but sometimes my car is vibrating when in idle.

I think the problem is on fuel filter (I didn't check it recently) or IAC valve or throtle body.

Dear friends, Is fuel filter cause for this issue?

I am planning to clean the throttle body and IAC valve.

I need your valuable advises to do this job by my self.

What is the proper way to clean this?

What are Chemicals used for it? (Please mention the brand and price)

I heard professional peoples are using a silicon grease or something to sealed up the gaskets and joints, What is that compound?

Where can I buy it?

What are the safe actions in this process?

Please help me. Thanks.

I need your help to identify the parts which RED circled and GREEN circled. I think RED circled one is not a MAF or MAP sensor. Then what is it? Should I clean it?

How to do it? I hope I can do this job carefully. I need your advices.

Thanks.

Rumesh88 · January 31, 2014

Encircled in ~~green~~ red color is the TPS (throttle position sensor) and one in ~~red~~ green is the EVAP VSV (Connects charcoal canister to the inlet manifold). TPS is nothing but a carbon track potentiometer with the switch for idle homing position. I do not recommend cleaning TPS with a solvent but you can just blow the dust off. Then you need to fix it back with proper adjustment.

Nice pics BTW. Did you get your PCV checked and cleaned during the last tune up?

EDIT: Sorry I made a mistake in the above. Please read as TPS is red encircled one and EVAP VSV is green circled. Am I going color blind?

Edited January 31, 2014 by Rumesh88

sampathapg · January 31, 2014

Encircled in green color is the TPS (throttle position sensor) and one in red is the EVAP VSV (Connects charcoal canister to the inlet manifold). TPS is nothing but a carbon track potentiometer with the switch for idle homing position. I do not recommend cleaning TPS with a solvent but you can just blow the dust off. Then you need to fix it back with proper adjustment.
Nice pics BTW. Did you get your PCV checked and cleaned during the last tune up?

Thanks for your prompt reply. Can you help me to identify the PCV in above pictures?

I think it didn't cleaned in last tune up. How to clean it?

How can I solve this vibration problem in my car?

I am waiting for your advises.

Rumesh88 · January 31, 2014

Thanks for your prompt reply. Can you help me to identify the PCV in above pictures?
I think it didn't cleaned in last tune up. How to clean it?

How can I solve this vibration problem in my car?

I am waiting for your advises.

PCV is not on those pics. It is on the cam cover (top) with a short hose connecting to the inlet manifold (you must have two hoses. not the thin one nearer to the throttle but the thicker one (1.5 cm diameter) in the middle). It is a plastic PCV just pushed through a rubber grommet into the cam cover. You can disconnect the hose and pull it out and clean the interior with petrol or diesel. If the internal mechanism is stuck keep it immersed in a little diesel for couple of hours and blow off. It is just a one-way air valve. Test it by blowing from engine side. It will not allow air to pass through from other side. If you shake it in the length-wise direction you will be able to hear/feel a feeble click indicating that the internal mechanism is free to operate.

As for your idle problem it can be due to one of many reasons but first eliminate the obvious and simple ones.

Edited January 31, 2014 by Rumesh88

Davy · January 31, 2014

Encircled in green color is the TPS (throttle position sensor) and one in red is the EVAP VSV (Connects charcoal canister to the inlet manifold). TPS is nothing but a carbon track potentiometer with the switch for idle homing position. I do not recommend cleaning TPS with a solvent but you can just blow the dust off. Then you need to fix it back with proper adjustment.
Nice pics BTW. Did you get your PCV checked and cleaned during the last tune up?

Rumesh88, I guess you meant the other way around but typed it wrong. TPS is the one circled in red and the the other one (circled in green) is the EVAP.

Rumesh88 · January 31, 2014

Rumesh88, I guess you meant the other way around but typed it wrong. TPS is the one circled in red and the the other one (circled in green) is the EVAP.

OOps! My bad. Thank you Davy for pointing it out. Added and edit line to the post.

sampathapg · January 31, 2014

PCV is not on those pics. It is on the cam cover (top) with a short hose connecting to the inlet manifold (you must have two hoses. not the thin one nearer to the throttle but the thicker one (1.5 cm diameter) in the middle). It is a plastic PCV just pushed through a rubber grommet into the cam cover. You can disconnect the hose and pull it out and clean the interior with petrol or diesel. If the internal mechanism is stuck keep it immersed in a little diesel for couple of hours and blow off. It is just a one-way air valve. Test it by blowing from engine side. It will not allow air to pass through from other side. If you shake it in the length-wise direction you will be able to hear/feel a feeble click indicating that the internal mechanism is free to operate.
As for your idle problem it can be due to one of many reasons but first eliminate the obvious and simple ones.

PCV located in Yellow circled place?

sampathapg · January 31, 2014

Yes I remember,

I have replaced this PCV valve few months ago. But it's not an original one.

I couldn't find an original PCV valve at that time.

I just remove it and took some photographs.

I tested it this way,

when I blowing from "B" side it's passing air to "A" side.

But when I blowing from "A" side it's not passing air through the valve.

I think PCV valve is working properly.

Edited January 31, 2014 by sampathapg

sampathapg · January 31, 2014

Rumesh88 · January 31, 2014

Ur PCV seems OK. Any idea why you changed it last time? Somewhat unlikely but still make sure the PCV rubber hose is not clogged up. Did you check the resistance of your plug wires? They should be something like 5 kohm for the shortest wire to 15 k for the longest.

sampathapg · January 31, 2014

Ur PCV seems OK. Any idea why you changed it last time? Somewhat unlikely but still make sure the PCV rubber hose is not clogged up. Did you check the resistance of your plug wires? They should be something like 5 kohm for the shortest wire to 15 k for the longest.

I will check the resistance of plug wires.

One probe of the multimeter should be touched on distributor side and one probe on spark plug side, Am I right?