Outer Limits 4x4 Board

My AFM needs a good clean, contact cleaner didn't do the job and I know of someone who took their prado to a toyota dealership who apparently soaked his AFM which brought it back to spec increasing power which by all means should bring economy back.


So what to "soak" the AFM in is the question considering it is cased in plastic.

I spray them with carby clean

Joel

Can I soak it in carby clean without damaging it? The type that comes in a normal tin(not a spray).

I put a whole can of carby cleaner through it today until the writing was off the stickers and the rubber seal went soft. I put it back in with some silastic just incase air has been aso getting past the seal.


I might be joshing myself but it feels kinda different, doesn't seem to take as much right boot to get off the line or sit at the speed limit

No power difference when I put the pedal to the floor though

high n mighty wrote:I might be joshing myself but it feels kinda different, doesn't seem to take as much right boot to get off the line or sit at the speed limit

That's about how mine felt after cleaning. Full throttle not a great deal difference, but response in the first half of the throttle improved noticably. Also a lot smoother in the gear changes.

It does work as the element gets coated with crap this effects the heating of it which is how the ECU works out fuel calculation.

Joel

I also noticed that the near new air filter was filled with sand. I guess the snokel must be right in the line of fire unlike my lux....


I will replace it though the week, if memory serves me the 17ltr per hundred was just after I put this filter in.


Don't get me wrong, it is still very free flowing but I will throw one in and see if it comes down again

CRC make a specific cleaner for a MAF.

CRC MAF Cleaner

Have no idea if it works or is advisable to do but ....

Just soak it in petrol, then metho to dry it out

HotFourOk wrote:Just soak it in petrol, then metho to dry it out

i hope your joking?

mud4b wrote:

HotFourOk wrote:Just soak it in petrol, then metho to dry it out

i hope your joking?

X2


As joel said, Carby clean is fine. Or a carbon/throttle body cleaner. You shouldn't need to 'soak it' and it would probably be a good idea not to 'soak' the eletrics. All you need to do is clean the hot wire in the middle of the sensor. DONOT attempt to touch or wipe the hot wire. just spray.
The AFM will work for partial throttle applications, most Engine management systems have predetermined values for Wide Open Throttle (WOT) application and hardly rely on AFM response as economy is not an issue if your driving WOT so injector pulse and ignition timing will increase to predetermined values and things like AFM and O2 sensor become asthetic pretty much.
That explains why you may notice an improvement in throttle response from start off etc.
Cheers Dan

Ruffy wrote:

mud4b wrote:

HotFourOk wrote:Just soak it in petrol, then metho to dry it out

i hope your joking?

X2


As joel said, Carby clean is fine. Or a carbon/throttle body cleaner. You shouldn't need to 'soak it' and it would probably be a good idea not to 'soak' the eletrics. All you need to do is clean the hot wire in the middle of the sensor. DONOT attempt to touch or wipe the hot wire. just spray.
The AFM will work for partial throttle applications, most Engine management systems have predetermined values for Wide Open Throttle (WOT) application and hardly rely on AFM response as economy is not an issue if your driving WOT so injector pulse and ignition timing will increase to predetermined values and things like AFM and O2 sensor become asthetic pretty much.
That explains why you may notice an improvement in throttle response from start off etc.
Cheers Dan

So you are saying that even if it feels like it has made a difference the fuel usage won't have changed?? Just a reference note, the wire isn't clearly visible on a prado afm, I'm no mechanic but I havent seen such an enclosed one before.


Hot40k is pulling the piss, he knows I have cleaned it already

No, he is saying you should see a fuel difference as the car will now be getting a better reading while at cruise(part throttle). The car ignores the AFM and EGO sensors at WOT(Wide Open Throttle).

Ahh good stuff, new air filter can only help too. Anyone wanna buy a fuel efficent prado


I'm kinda serious, it is outta here in a couple of weeks

mud4b wrote:

HotFourOk wrote:Just soak it in petrol, then metho to dry it out

i hope your joking?

What? I did that to mine after I used the sand for the port polishing


HnM finally feels like a big man again in his HiLux

Soooooooo.....Any difference to fuel economy Craig?