How to clean MAF

Ariamius · 08-06-2011, 09:31 PM

I have an 88 Turbo 7mgte it has the KVAFM sensor. Bought CRC MAF cleaner. Lucky for me, I read the bottle...if u can't use the cleaner, how do I clean it properly?

Ariamius · 08-06-2011, 10:10 PM

Also, any help in how to clean the idle air control valve and the TPS would be greatly appreciated.

cre · 08-07-2011, 12:05 AM

Don't try to clean the AFM. You don't have a MAF, by the way... very different types of device. You can use compressed air to blow debris out of the honeycomb but There's not really anything I'd recommend beyond that.

The TPS isn't something which needs to be cleaned... it's mounted on the exterior of the throttle body and just interfaces with the throttle plate's shaft.

The ISCV may be sprayed with carb cleaner but I don't recommend it for GTE's as there is a rubber diaphragm behind it... in that case just take it off and spray it out thoroughly. Don't open the stepper motor side of the unit.

professorbob · 11-09-2011, 04:57 PM

In an effort to correct a problem with the engine being unable to move out of limp home mode. (see thread elsewher) I have removed the Idle Speed Control Valve ISCV and the Throttle Position Sensor TPS to eheck. The position sensor checks OK with the meter. The Idle Speed Control Valve was covered with bypass blow by. I use carb/brake cleaner and sprayed down the recirculation tube while keeping the stepper motor upright so it would the valve closure cone. I then used compressed air to blow out the port and cone. It is somewhat clean, but have a .... QUESTION: Is the passage suppose to be air tight. I am still able to blow by the valve cone. Also, are there any resources other than the dealer for shaped hoses, as the 1/2 inch broke off when I removed it.

cre · 11-09-2011, 11:38 PM

It really doesn't matter if it stays open a TINY bit while at rest as any air coming through has been metered. As far as I know, the computer simply adjusts it as needed until the airflow is within spec, it does not have a "closed" position to which it returns to when the car is turned off that I've ever noticed. The GTE has a diaphragm following the ISCV which should not allow air to flow back into the ISCV from the intake plenum... The inclusion of this alone leads me to believe that Toyota knew it was going to be open to some degree in all situations.

professorbob · 11-10-2011, 01:45 PM

Thanks, I'll run the power own stepper motor test and reinstall once I locate the replacement hoses. Really appreciate your help. Prof

08-06-2011, 09:31 PM	#1
Ariamius Stock Join Date: Aug 2011 Location: Louisiana Posts: 10	How to clean MAF I have an 88 Turbo 7mgte it has the KVAFM sensor. Bought CRC MAF cleaner. Lucky for me, I read the bottle...if u can't use the cleaner, how do I clean it properly?

08-07-2011, 12:05 AM	#3
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	Don't try to clean the AFM. You don't have a MAF, by the way... very different types of device. You can use compressed air to blow debris out of the honeycomb but There's not really anything I'd recommend beyond that. The TPS isn't something which needs to be cleaned... it's mounted on the exterior of the throttle body and just interfaces with the throttle plate's shaft. The ISCV may be sprayed with carb cleaner but I don't recommend it for GTE's as there is a rubber diaphragm behind it... in that case just take it off and spray it out thoroughly. Don't open the stepper motor side of the unit. __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

11-09-2011, 04:57 PM	#4
professorbob Intake Join Date: Nov 2007 Location: Lavonia Posts: 49	Idle Control Valve closure ? In an effort to correct a problem with the engine being unable to move out of limp home mode. (see thread elsewher) I have removed the Idle Speed Control Valve ISCV and the Throttle Position Sensor TPS to eheck. The position sensor checks OK with the meter. The Idle Speed Control Valve was covered with bypass blow by. I use carb/brake cleaner and sprayed down the recirculation tube while keeping the stepper motor upright so it would the valve closure cone. I then used compressed air to blow out the port and cone. It is somewhat clean, but have a .... QUESTION: Is the passage suppose to be air tight. I am still able to blow by the valve cone. Also, are there any resources other than the dealer for shaped hoses, as the 1/2 inch broke off when I removed it.

11-09-2011, 11:38 PM	#5
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	It really doesn't matter if it stays open a TINY bit while at rest as any air coming through has been metered. As far as I know, the computer simply adjusts it as needed until the airflow is within spec, it does not have a "closed" position to which it returns to when the car is turned off that I've ever noticed. The GTE has a diaphragm following the ISCV which should not allow air to flow back into the ISCV from the intake plenum... The inclusion of this alone leads me to believe that Toyota knew it was going to be open to some degree in all situations. __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

11-10-2011, 01:45 PM	#6
professorbob Intake Join Date: Nov 2007 Location: Lavonia Posts: 49	Idle Air Control Valve Thanks, I'll run the power own stepper motor test and reinstall once I locate the replacement hoses. Really appreciate your help. Prof

08-06-2011, 10:10 PM	#2
Ariamius Stock Join Date: Aug 2011 Location: Louisiana Posts: 10	Also, any help in how to clean the idle air control valve and the TPS would be greatly appreciated.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Citric Acid? To clean Catalytic Converters? For real?	ravenmaster	Non-Generation Specific Questions	11	02-13-2018 06:23 AM
looking for CLEAN 1j, 2j swapped targa mk3	brandonmbyers	Buy/Sell Cars	0	02-01-2011 07:04 PM
What is a good way to clean out the engine bay?	D_Train	MKIII Supra	21	05-19-2007 07:11 PM