What's Wrong With My R33? Please Help!

[AlexR34GT]

I have a 1993 R33 Gtst series 1 which I bought in June, the engine and ecu are completely stock (hard to believe I know) and the car runs completely fine... most of the time. About once every few weeks it will have a spasm and will not let me go past 2 and half rpm on any gear and jerks violently as if the revs are too high and just cuts the accelerator power once it tries to go past 2 and half rpm.

I am thinking along the lines of something to do with the turbo or maybe AFM, I was just wondering if this has happened to anyone else or if it is a common problem and if someone could offer me some ideas with with how to fix this problem.

Any help/ ideas/ input would be appreciated.

I have 2 videos I recorded today of this occurring but am unable to upload it as it is in mp4 format and am not sure how to convert it so it can be uploaded.

[Josh080691]

Swap afm for known working one and /end thread. Its a common fault and someone has it every week. Good luck with the nee car mate

[SargeRX8]

Sounds like an afm issue especially and the lower spectrum of the rpm. If you're handy with a solder you can crack it open and soldier all the joints inside it. Its not likely the element is damaged but more likely there's a cold solder in there. If that doesn't fix it then it might be a long road.

[89CAL]

OP, post up a pic of the inside of the AFM if you want some opinions. The top of the box part is just glued on, bit of mucking around with a knife etc to get it off but not so hard. Should be able to see the problem if it needs a joint or 2 resoldered

[Mick]

it could be surging due to clogged injectors, run a $10 bottle of injector cleaner through your tank, fixed mine with similar problem and even if its not the problem at least you will have clean injectors

[AlexR34GT]

Ok so I've managed to open it up and have a look inside.

Here is what it looks like..

Is anyone able to help me out with some ideas?

Thanks.

[75coupe]

From the photos there looks to be a burn hole, at the bottom on first and second photos.

Is that what it is???

[Mick]

if it is the afm you may not see an obvious fault in the circuit board cos it could just be a dry solder joint so just hit each pad with the iron to make sure the pad is good, but i still think you should try injector cleaner cos it fixed my similar problem

[AlexR34GT]

No it's not a burn hole, its just glue.

So I ended up just re-soldering the 4 connection pins which you can see in the 3rd photo because I could see one of the pins looked like it wasn't connected properly. Hopefully this fixes the problem but it will be hard to tell because it was a rare occurrence in the first place.. so time will tell.

I like your idea of injector cleaner too Mick, I might do that as well since it's cheap and can't hurt by giving it a go also.

Thanks for your help gents, I'll let you know how it's going in a few weeks time.

[AlexR34GT]

After re- soldering those 4 pins in the AFM I've been driving around Sydney quite a bit and the other day I drove Newcastle and back. My problem is fixed!

Thanks for the help!