R33 Cutting Out Randomly

[xhxr6t]

Hey,

I just purchased a 1995 r33 gtst for the missus, and its having an issue where is randomly cuts out. It can be when cold or hot, WOT or idle. Some times it last 1 or 2 secs, and a few times it has lasted 10 secs. Sometimes its very often, other times it can go 25 mins without any issues.

So far I have checked the error codes. It came back with a 12 (AFM) . I pulled it out, still had pod adapter on so wasn't bolted to airbox, and was filthy. I cleaned it and bolted it to airbox. Looked to be fixed but once again it eventually started cutting out again.

I'm thinking its not the AFM any more, as its a solid cut, like ignition cut.

I've read a lot of people saying the CAS but the previous owned said he replaced it (was with a 2nd hand one though).

Any ideas before I have to buy a new CAS?

[Got a Pulsar]

Could be loose / dry solder joints in the AFM? could explain intermittent randomness.

There is a DIY fixup thread around here somewhere...

ahh, there it is. --->> Click this!

Should be along the same lines for RB25.

[MarcinhoR33]

Had the exact same issue. What I did was clean my afm entirely, took the four screws out and took off where the cable plugs into (realised I shouldn't have done that because it broke the solders)

Ended up cleaning it with contact cleaner and resoldering it back together.

Took off AAC valve as I found out they fill up with carbon, gave that a hit of contact cleaner and got scrubbing with cotton buds.

Unplug the purple and brown plugs near the centre of the firewall and spray some more all over the contacts. Also spray contact cleaner on the afm plug. I basically did them all at the same time so I didn't work out what was the main culprit butit mostly was the afm... good luck

[xhxr6t]

So you think the AFM could cause the ignition cut if there is a faulty connection? Because I was starting to think it wasn't AFM as it will run without the AFM plugged in.

The ECU error is still saying AFM though, So i might have some faith and follow your instructions.

[MarcinhoR33]

At first I just sprayed through the airbox onto the sensor and it fixed for a couple of days but then it started cutting out again. So yeah I ended up breaking the original solders unintentionally which I soldered back up and while I was able to get to all the shiny bits inside I flooded it with the CC, put it all back together and it's been fine since. No hint or anything. There's DIY thread on here somewhere and I just followed that.

[xhxr6t]

Ok, sounds promising, I just pulled it off and re soldered it all. Waiting for the silicone to dry then ill give it a test drive.

[MarcinhoR33]

Hopefully it goes good

[xhxr6t]

^{It seems to be fixed!!!}

^{Drove it twice on the weekend without a single cut out!}

^{Thanks everyone!!!}

[Got a Pulsar]

It's nice to get a bit of closure on these kinds of threads.

Glad you got it sorted.