Jump to content
SAU Community

Nm35 Stagea Afm Fault

Daleo

By Daleo,
in Four Door Family & Wagoneers

 Share

Recommended Posts

Daleo Grand Master

Daleo

Posted
Posted

So, I've had an interesting week or so.

When my car was started from stone cold; it had no issues. I could drive to work, leave the car all day, then drive home again.

If I stopped fill up, or go & do some shopping, then restarted the car; initially, it would randomly stall at idle, and throw a CEL code; P0100, which is the AFM. It did it once, then not again for several days. Reset code; no issues.

If restarted, the car would drive normally. Progressively over a week or so, it would stall more regularly on a hot restart.

Then t would throw the light immediately at hot start, and when you accelerated, it would get to 2200rpm, and start stuttering as if the AFM was disconnected.
After a few minutes of driving it would behave as normal.

I replaced a very dirty air filter, but no real change.

Cleaned AFM; no change.

It occurred to me, that on my Informeter; if the intake temp was above approx 35-40 deg; the problem would manifest, and it started doing the same thing if driven in traffic, and the Intake temp rose to the set level.

Eventually, the CEL would not reset, but as long as the Intake temp was around ambient or below 35 deg, the car would drive perfectly.

Replaced AFM with the spare I had from Scotty (for just such an occasion) reset CEL; issue hasn't reoccurred.

Very strange.

Can anyone with an Informeter tell me what their AFM reads when the engine is NOT started? Just with the key in the ON position?

Mine is roughly 1.02v even before being started. Settles around 1.47-1.50 at idle.

Cheers guys, hope this helps someone. I've never seen an AFM fail in such an unusual and random fashion.

Link to comment
https://www.sau.com.au/forums/topic/446016-nm35-stagea-afm-fault/
Share on other sites
Daleo Grand Master

Daleo

Posted
  • Author
Posted

Yep, it sounds about right at 1v. The afm can actually read reverse airflow down to 0v.

Hey mate, thanks for that. :worship:

Can you put me on the list for a replacement when you have some? I'll forward some cash to you in the next couple of days. ;)

Daleo Grand Master

Daleo

Posted
  • Author
Posted

I have plenty mate, can you try out my new site for me? I want to check it works.

http://scottyscustoms.com.au/product-category/m35-stagea/

Looks to be working fine mate. :yes:

Nice looking site !

scotty nm35 Grand Master

scotty nm35

Posted
Posted

Looks to be working fine mate. :yes:

Nice looking site !

Thanks. A customer did some bartering with me. :)

Mobile friendly, shopping cart, built in postage calculator. Now I have to find the time to insert all the product data. :/

  • Like 1
Brick Mentor

Brick

Posted
Posted

Thanks. A customer did some bartering with me. :)

Mobile friendly, shopping cart, built in postage calculator. Now I have to find the time to insert all the product data. :/

Looks good scotty.. simple and it works. Needs more M35

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • Kinkstaah
      Strange issue RB25DET wont start

      By Kinkstaah · Posted

      I've seen similar actually in my situation. You never know what tables are attempted to be used when the car thinks it's -99C or +200C. The fail state is not usually that extreme but you know what I mean - it was in my case though! This is where being able to read all the sensors is useful cause you see this stuff really quickly.
    • Kinkstaah
      First time Skyline owner

      By Kinkstaah · Posted

      The above is very important. However as long as you keep timing relatively low, it's plausible to make your own knock ears and plausible to learn to tune with a modern ECU that can do wideband O2 correction like a boost controller. I mean if you only have one viable road to even drive the car on, learning to tinker to this level may be worth doing given you can't do much else with the car...?
    • Kinkstaah
      Chris' Toyota Mark ii JZX110

      By Kinkstaah · Posted

      I find the fact that the rear plate has to be bent inwards at the rear not so bad: but the front is just awful: It's like come on. (these are my very old, now retired/turned in plates) TBH it is a lot of money to fix a minor issue, the fact I said "I'll never really spend the money on doing this" is why people ended up buying them as a gift for a 'car guy' who can be hard to shop for.. for car guy things.
    • GTSBoy
      Chris' Toyota Mark ii JZX110

      By GTSBoy · Posted

      I just bent the ends of my premo plates. It even went through Regency like that after the engine conversion and the inspector (a great bloke!) just squinted his eyes and said "I didn't see that". Plates, and how they look, are just something that have zero importance to me.
    • GTSBoy
      Strange issue RB25DET wont start

      By GTSBoy · Posted

      Yeah, I would have said the same. It makes me suggest that there are other things wrong, such that the ECU is totally unhappy with the broken sensor. The only other thought here is that maybe it is shorted, which might cause a different issue to the typical "disconnected" sensor.
×
×
  • Create New...