Dodgy airflow meter :o(

[marcus]

Hi all,

I think I have a dodgy airflow meter as the car has hiccups on cruise.

I have a R33 GTS-t series 1, and was wondering if you guys could help me out with the following;

Do I purchase another standard airflow meter?

Or is there something better available aftermarket?

How much are they generally? brand new and second hand?

Where can I get my hands on one?

Any help or advice would be greatly appreciated.

[Lazy-Bastard]

I had the same problem with my S1 R33

I dismantled the AFM and resoldered the joints from the PCB to the plug pins and haven't had a problem since.

I'm not saying that this will work for you, but it did for me.

You will need to silicone it back up after you put it back together to make sure it is sealed from water etc.

[R33RWKW]

If you need to replace it, I'm not sure if you can get another standard RB25 AFM from Nissan, but could be expensive if they have them. Depending on the power of your engine and if your planning mods in the future, a Z32 AFM is a good aftermarket upgrade, it is the same size as the std one & a direct fit (80mm) and can handle up to around 300rwkw. Try www.nengun.com, if you want a new Z32 - about $460.00 or so. If going for second hand do a search on the forum, people are selling them now and again for half the price. I am having my AFM checked when my new engine goes in & if its gone, I will be definitley fitting a Z32 .

[marcus]

Thanks guys, just a couple more questions;

How do you actually get inside the airflow meter to resolder it?

What sort of hp is the standard airflow meter good for?

(I currently have 250rwhp on 9psi)

I've only noticed the hiccups since the installation of the new FMIC and CA intake...

[R33RWKW]

Standard RB 20/25 AFM - 226 RWKW/378 BHP

Z32 AFM - 255 RWKW/415 BHP

- Although some people have their AFM's maxing out between 180RWKW & 200RWKW on 14psi using aftermarket turbos. On a stock turbo & a well tuned/well set up car they should not max out to around 225RWKW, depending on the boost level of course. Can't help with the re-soldering, someone else on the forum might be able to send some pics, or take it to your nearest performance shop who have experience working on AFM's. If you decide to replace, not fix, I would ring your closest Nissan dealer, to get a quote and for a standard RB20/25 AFM if avaiable. In the previous post I said Z32's were around $460 from Nengun, but I have seen them available tonight from another shop - UPI Performance in Moorabbin, Victoria for $440.00.

Cheers, Chris

[marcus]

Cheers chris, just one other question about the meter from a z32. Is there any rewiring involved or is it a straight swap???

Marcus

[marcus]

Bump - Anyone else out there had similar probs??? Any advice would be appreciated.

[yogi000]

z32 will require wires to be cut and soldered.

maybe try cleaning ur afm with electrical contact cleaner or others use brake cleaners and then see if u have hiccups

[marcus]

z32 will require wires to be cut and soldered.

maybe try cleaning ur afm with electrical contact cleaner or others use brake cleaners and then see if u have hiccups

I will try that, and maybe try resoldering the points again. Any one have step by step instructions on fitting a z32 meter to a skyline? Also curious to know if anyone has done this mod and how things have been running with it?

Cheers

[Guest Mashrock]

get rid of it

:wassup:

[marcus]

Anyone know exactly what I have to do to fit the z32 meter??? ie; is there adaptors out there??? where??? how much???

[GunMetalR33]

I am not sure if you can use the z32 with the standard ecu. If you have a PFC you can though. If I was you I would just clean the sucker with electrical contact cleaner. Test the cleaner on your hand first, if it leaves no oily stuff on your hand it should be good to use on your AFM.

[marcus]

I am not sure if you can use the z32 with the standard ecu. If you have a PFC you can though. If I was you I would just clean the sucker with electrical contact cleaner. Test the cleaner on your hand first, if it leaves no oily stuff on your hand it should be good to use on your AFM.

Hmm, never though of that. Has anyone out there fitted one on their skyline with the standard ecu???

I have cleaned it out and also resoldered the contacts as one looked dodgy. Also disconnected the battery to reset the ecu. Will test tonight to see how it goes. But things never work out for me so will definately keep investigating.

[Abo Bob]

I doubt very much that a Z32 would work with stock ecu.

[marcus]

I doubt very much that a Z32 would work with stock ecu.

Maybe you're right but i don't know enough to comment

Do you know this for sure or are you guessing???

Could it possibly be that its the ecu rather than the AFM causing hiccups on cruise??? The problem has only been there since the new FMIC and CA intake....

Can anyone else confirm the Z32 AFM theory please???

[Abo Bob]

well I know that the RB25 AFM reads up 5 point something volts and the z32 one reads up to 3 point something volts but it is reading more air for those 3 volts than the RB25 one is reading at 5 volts.

So I guess that means that far more air will be going into the engine than the AFM is telling the ECU so the ECU wont put enough fuel in and your motor will blow up from being too lean or it just wont run at all.

Of course I don't know all this for sure. I'm just exercising my mind here.

[Abo Bob]

As for the hiccoughs on cruise, you need to find a friend with the same car to swap the AFM and ECU (separately) to confirm whether either of them are at fault here.

[marcus]

As for the hiccoughs on cruise, you need to find a friend with the same car to swap the AFM and ECU (separately) to confirm whether either of them are at fault here.

Yea I wish I could but being in a location like East gippsland, there is either utes or utes. I just took it for a drive now with the airflow meter resoldered, but no real change (

The stoopid thing is when I got it dynoed, the mixtures were fine, 4 dyno runs and all good!!!

So no point in getting the Z32 meter without aftermarket ecu???

[yogi000]

basically the z32 is calibrated differently, my stock afm was reading 5.1v at full throttle @ 12psi now with the z32 is reads 4.02V at full throttle.....the car runs when you put the stock ecu back in, but isnt very happy to rev past 3000rpm with the z32 afm.

You can get ur ecu chipped so that the maps can be edited accordingly and then the z32 will work.

Also you can hook up an multi-meter on it and see what voltage its hitting under full throttle/partial throttle and you might find the problem then.

Try resetting the ECU?

[marcus]

basically the z32 is calibrated differently, my stock afm was reading 5.1v at full throttle @ 12psi now with the z32 is reads 4.02V at full throttle.....the car runs when you put the stock ecu back in, but isnt very happy to rev past 3000rpm with the z32 afm.

You can get ur ecu chipped so that the maps can be edited accordingly and then the z32 will work.

Also you can hook up an multi-meter on it and see what voltage its hitting under full throttle/partial throttle and you might find the problem then.  

Try resetting the ECU?

Yea resetting didn't help. I might have to dig deep and get an ecu, maybe then it'll be alright...