Problem, Huge random miss, NOT Boost CUT

[EnricoPalazzo]

Well ive been searchin for the last hour and the closest thing I have found to my problem is it could be AFM related, however heres the story.

I got defected, and hence had to replace my a/m parts with stockies. Since then I have had problems with the car. I have since re installed my exhaust BOV and pod airfilter and the problem is still occuring.

What happens is that i could be cruisin in any gear like a grannie, and the power just cuts off for half a second randomly. Today it happened in 2nd at WOT 3000rpm, but moslty in 4th or 5th with 10% throttle just drivin.

Now it cant be boost cut as im running stock boost, actually 8psi due to exhaust on dyno, yet as i still ahve 2 stage, i dont get anywhere over 5psi until 5000RPM, and all my problems are happenin way before 5k.

I never had a problem before i had to replace my a/m parts with stock ones. So im baffled to why this is happening when my car is back to how it used to be. Ive tried reset the ECU and this did nothing. It still happens randomly.

Does anyone have any ideas? This is really bad, the only thing i can think of is that i didnt install one of the hoses or parts back on properly.

Any help is greatly appreciated. Thanks guys.

[EnricoPalazzo]

Anyone? Bump!

[Steve]

If its intermittant, the first place i would be looking is wiring.

Have you checked your electical wiring going into AFM?

The stock ECU will put the car into 'limp home' mode if it detects a fault with the AFM (limits revs to about 2500?). Perhaps you bumped the plug when you messed with the pod? And now it has an intemittant fault - loose plug or wire?

You could also do some diagnostics on the ECU, or try an ECU reset. Is the O2 sensor plugged in OK? this is only guessing, but it usually pays to check everything that has been touched when changes are made, as this is the most likely place problems will occur.

Nothing very definitave but hope it may be of some help.

[EnricoPalazzo]

Ill re check the O2 sensor and the AFM plug. I spoke to clint32, he thinks it could b my AFM. Im just confused as it was all fine before. Also will check the BOV and everything else i touched. Also I forgot to mention, the car has been stallin like crazy. I reinstalled my HKS EIDS and it seems better, still does it. It seems that it could b the AFM as a few nites ago, i was drivin from work and as soon as i got to 2500RPM, the car would splutter, not accelerate and would stall. Ill keep you updated. Am also about to buy some electrical conduct cleaner for my AFM.

Hope it works.

[Steve]

Just make sure the contact cleaner is non residual. Either that or go a good non residual brake cleaner.

If you pull the AFM and O2 plugs and give them a good squirt too, it may help.

Good luck

[lowlux]

could be the CAS as they tend to burn out when hot

[EnricoPalazzo]

CAS? Well im thinkin its the AFM , however the conduct cleaner did squat... Hmm could it b residual? Ill check.

Its called EML contact cleaner lubricant. Cant see if its residual or not.

Hmm im runnin outa ideas

Also their is somethin else i forgot to mention.

When i started puttin the parts back on the car, i put the BOV and airpod on. I kept the stock exhaust on unitl a few days later. Anyway the car was fine for a whole day, then the problems started happening.

Actually the first sign of problems was the same day, but 2 hrs before i put the parts on, i was drivin home from work and the car wouldnt accelerate over 2500RPM or else it would splutter and stall.

Geez i hope im makin sense here.

[Steve]

Have you done a diagnostic on the ECU? If a contact cleaner says lubricant - I wouldnt touch it with a barge pole, I would bet its residual.

[Clint32]

Generally if it happens at a certain rpm its the afm, when mine went i could not go over 3k from memory otherwise it would cut out and hesitate badly, then it would stall and not want to go for a while.

If you want to try that AFM PM me and you can try it, i will be home all day tomorrow.

[EnricoPalazzo]

Hmm the wierd thing is that its random. I can still rev to redline sometimes if needed, althou im not goin to. It will cutout for half a sec, then continue to accelerate

I checked the connections. They seemed fine.

Steve: what would the 02 sesnsor behind the car have to do with it?

[Steve]

Not sure. My guess would be AFM, but I dont know enough about the actual fault to be certain, so I suggested check everything.

I did have my O2 sesor wire short out to the exhaust (aftermarket dump) and that caused problems, but they were a bit more catastrophic than a tempory loss of power - it was total until I found and fixed the problem - long story.

[NuGGeT]

did u ever find out what was wrong?

[BOOSTD]

A/F meter and ECU were both stuffed.

[NuGGeT]

i have the same problem in my car!

u can be driving along and out of no where it'll splutter, stall and wont go over 2.5rpm

but it only happens every now and again

i took my car to get checked out and the guy syas theres nothing wrong with it! its a frinking joke

get pissed off now

he said he checked out the afm and its fine

[Steve]

Wasnt the plug to the ecu a bit loose/warped?

[BOOSTD]

Nugget: if it is only every now and again, it will just be your A/F meter. People have fixed them by getting new plugs and/or replacing or resoldering the Pins in the A/F meter. I a common problem in GTR's when the Meter has been knocking on the Chassis.

[EnricoPalazzo]

Nugget: Same thing happened to me. i fixed my AFM still didnt work, then replaced ecu and then it worked, but a week later started again.

It was the loom plug into the ecu aswell. So i strapped that as hard as i could into the connection, and its all been good for ages now.

Goodluck.

[NuGGeT]

Thanks for the advice! good bless this forum!

the 2 machanics couldn't find anything wrong :S

i had to tell them what to fix so i'll find out this arvo is it worked