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Afm Problem

gtr.nation

By gtr.nation,
in Engines & Forced Induction

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gtr.nation Apprentice

gtr.nation

Posted
Posted

Hi, I had a GT-R33 with pfc L jetro later changed to D jetro. I am having a few problems with my other car which also has an afm , its behaving like crap the symptoms are

1. Stalling when slowing down and shuts off
2. Missing every second or two

3. Cant rev over 3000 without making lots of and smoke out the exhaust
4. And every now and then entering limp home mode when first starting the car

I want to know that there is an adjustment screw in the afm which is used for mixture setting, by using that can i solve the this problem ?

Does Every AFM has this screw ?

What else should i look for apart from AFM ?

How can i check if the AFM is good and it is giving correct signal to the ecu?

The engine is 1jz vvti swapped in an Rx8.

Your precious advice is needed, THANKS.

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Marcus89 Proficient

Marcus89

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Posted

Your post is seriously confusing.

Do you have a power-fc D jetro in your new car? As far as I knew d jetro meant it used MAP sensor not an AFM.

There is no adjustment on AFM's it is all controlled by the ECU (unless toyota is very different). Your first port of call would be to clean the afms. Another option is to ask a mate who has a 1jz that is working and borrow his afms just to ensure that is the cause of your problems

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GTSBoy Grand Master

GTSBoy

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Posted

You should have tried a Toyota forum.

The Nissan AFMs are hot wire anemometers. No adjustment screw.

The Toyota AFMs (on JZ engines) are vortex counters. No adjustment screw.

What you actually need to do is tune the PFC properly and get rid of any stupid venting BOVs or other poor installation choices.

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gtr.nation Apprentice

gtr.nation

Posted
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Your post is seriously confusing.

Do you have a power-fc D jetro in your new car? As far as I knew d jetro meant it used MAP sensor not an AFM.

There is no adjustment on AFM's it is all controlled by the ECU (unless toyota is very different). Your first port of call would be to clean the afms. Another option is to ask a mate who has a 1jz that is working and borrow his afms just to ensure that is the cause of your problems

There is a friend who has the same engine lives in other city he says that his 1jz vvti afm has a mixture controlling screw, i was like WTF ! i tried finding that out but i couldnt find any on mine. In my city these engines and afms are very rare. Found 2 units but by they are old so i am not sure if they would work properly.

I read in some BMW forum that in beamers there AFMs have adjustment screws and they can check the out put voltage on the AFM. Normal range is between 0 - 5v , if afm is seeing more air it will increase voltage to 7v some thing like that.

Any one tried this ?

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