NewHilux.net

On a hilux the air filter is replace every 30000km

Now you clean it quite a few times in between but next to no one cleans the MAF sensor .



This unit had covered 31000 km and was way out of specification

Easy way to check is to remove it.
Others can use a scan tool to check

It should output close to .37 grams a second key on engine off.

This one was outputting .78 grams a second key on engine off

This is because of the two sensor wires



The wire on the left is a heated wire that gets to 600 deg c

The other wire is a sensor wire.

Both need to be very clean to work correctly as this one was not. It is very dirty

The reading comes from the slight power adjustment to keep the wire at 600 deg c.

So if the wire is dirty it will be less sensitive to the air passing over it.

This means the computer sees there is more air entering the engine than what actually is.

So the computer injects more fuel for the incorrectly measured air. This causes black smoke and pore performance.



The sensor on the left here is a intake air temp sensor. This lets the computer know what temp air is going In to the motor is at.

This is used in conjunction with other sensors to calculate air density.



Hope you find this as interesting as I do.
And please keep your MAF sensors clean.

Good info once again Boxhead. What products are safe to use for cleaning it?

Cheers,

Chris.

Crc and worth make specific cleaner for the job

Very informative BH. I clean mine regularly, but just learnt I've only been cleaning half of it The air temp half. I had no idea the other 2 wires were hidden away up there. Sounds like a 2 minute job for this morning

Thanks Bh is the sensor the same for the v6 as I have been doing the same as rod and only doing the air temp sensor.

Planning to clean mine this arvo. Don't have crc or wurth maf cleaner. Can i substitute it with electronic contract cleaner? Doesn't leave residue i believe.

Rocket55 wrote:Very informative BH. I clean mine regularly, but just learnt I've only been cleaning half of it The air temp half. I had no idea the other 2 wires were hidden away up there. Sounds like a 2 minute job for this morning

Same here. I think I'll do it right now!

I cleaned mine today with CRC MAF sensor cleaner and the o-ring swelled and isn't seating properley now. I gave it a good spray, maybe too much??

This one is appropriate.
I'm glad I took the cover off to have a bit of a look.
I cleaned the MAF sensor today and also the filter with the CRC product. Never had a problem with the O ring but I did find another problem.
Can anyone spot it.

Don't let the arrows give it away.

and fixed up.

It ALWAYS pays to double check work... Spend a few minutes going over to make sure that stuff is done right.

Looks like its been overtightened and split the hose???
I had my injectors done the other day by a well known mechanical business and they over tightened the front bolt on the intercooler driving the bolt up and punching a hole in the underside of the intercoolers plastic end tank.
I only found it cause i am pedantic with my vehicles and traced the oil spray back to the source which was the bolt through the intercooler. I took it back and they repaired it without charge, but then had the audacity to match mark a bolt on the engine cover as if to imply i had done it.
A week later i found a filter wrench that had been dropped down between the winch and the ac condenser. I choose to return it for the embarrassment factor. It was one of those 'now you know that i know' moments.
Its hard to find a good, trustworthy mechanic.

Nah Cruiserdog.
The hose clamp in the first photo had not been put back on, was sitting down loose down on the EGR body.
Refitted it in the correct position and retightened it in the second pic.
All fixed.. A simple mistake.
What I was trying to highlight is it pays to put a second set of eyes over your vehicle after a service.

Ah yeah i should have looked closely at the first pic!! Still though your paying for a service from a professional, stuff like that shouldn't be missed.

Cruiserdog wrote:Ah yeah i should have looked closely at the first pic!! Still though your paying for a service from a professional, stuff like that shouldn't be missed.

Stuff happens..

10 luxxxx wrote:Thanks Bh is the sensor the same for the v6 as I have been doing the same as rod and only doing the air temp sensor.

X2
Would also like to know about using contact cleaner...
I used it to clean the air temp one the other day had no idea about the 2 inside

Contact cleaner is fine.
And the v6 is the same unit.
Hope this helps.

Hey Boxhead, under what conditions should the elements be sprayed, cold or warm? I bought some crc maf cleaner and I think it said something about heating the element up so it was warm before spraying. Thoughts?

Shit no. Off for at least 2 min.
If you got that heated wire when hot
You could crack the ceramic covering it

Always cold
Always off for at least 2 min
And remove oring as some have found it swells.

Have fun.

also note, you 'can' use a cotton tip to clean those wires, BUT be VERY GENTLE and VERY CAREFUL, as the last thing you want to do is break them!

Steve

Thanks Boxhead, like others I've only being doing half a job

Rocket55 wrote:Very informative BH. I clean mine regularly, but just learnt I've only been cleaning half of it The air temp half. I had no idea the other 2 wires were hidden away up there. Sounds like a 2 minute job for this morning

X2