dying at 5000rpm

[ranys33]

Hey guys, im new to skyline Australia and i would like some help.

My skyline r33 is losing power when i flat foot and the rpm reaches 5000rpm or so. Recently the problem has seem to evolve and make the car die out past 5000 rpm and what i mean is, the car is still on but there is no power what so ever past 5000. I've had this problem before except the dying out part and i fixed it with AFM. I have bought 2 AFM's and put them in the car and reset the ecu, however the problem is still there but the car dying out problem seem to be gone. Does anyone have any advice on what i can check next please. Im a student so i dont wanna go out and spend more money for nothing.

My car only has a few mods: (STOCK ECU + BOOST-no boost controller)

 

1.Spitfire coils packs

2.FMIC

3.After market fuel pump KEMSO 340LPH

4.Exhaust system turbo back

5. Iridium sparkplugs that i replaced about 6-8months ago. (Have not touched the gaping)

Tomorrow i will check the coils and spark plugs, but is there anything else i can check? Ive also checked previously for air leaks but found nothing.

Can timing belt be an issue? and o2 Sensor?

Thanks!

Rany

[Rusty Nuts]

Partially collapsed cat or muffler or flattened exhaust pipe can do that,  had a Falcon that started doing this at higher revs then one night on the freeway it fired a blazing ball of muffler packing out the tailpipe and became much louder.

[ranys33]

my exhaust pipe is abit  damaged but ive had the car for over 3 years and never had a problem except the afm breaking down. I replaced that and the car starting to drive normally again. I will check it tomorrow, thanks for ur reply.

[Rusty Nuts]

You are most welcome mate good luck.

[wildeagle44]

Maybe bypass the knock sensors? Could be pulling timing. 

Does it happen in every gear?

[BBGTR]

Sounds like the igniter module, they sometimes break down at higher revs when they get old.

[ranys33]

14 hours ago, wildeagle44 said:

Maybe bypass the knock sensors? Could be pulling timing. 

Does it happen in every gear?

This time it is happening every gear. I cant flat foot on any gear from 1 to 4 so i'll check it out. would you know where their located?

Thanks mate

12 hours ago, BBGTR said:

Sounds like the igniter module, they sometimes break down at higher revs when they get old.

Thanks mate i'll have a look into it today.

[ranys33]

Also guys. The problem is happening even when im not driving it. When i give it while the car is on a complete stop, THE AFM starts to make noise and shakes. Could it be that even the 3rd afm i bought is faulty?

[KiwiRS4T]

Disconnect it and see. Check also the plug and associated wiring.

[ranys33]

19 hours ago, KiwiRS4T said:

Disconnect it and see. Check also the plug and associated wiring.

I've checked the AFM and put it into another skyline, it works perfectly fine. Ive changed the coil packs and still the same problem.

Can it be the o2 sensor or fuel pump?

[Rusty Nuts]

The data sent from the car’s oxygen sensors to the computer helps it adjust the air-fuel mixture for optimal operation. If a sensor is bad or failing, the computer won’t be able to adjust this mix correctly. Also a clogged fuel filter can cause similar symptoms. Combine the two and you are in a world of pain. A new fuel filter is a cheap starting point buddy.

[ranys33]

21 hours ago, Rusty Nuts said:

The data sent from the car’s oxygen sensors to the computer helps it adjust the air-fuel mixture for optimal operation. If a sensor is bad or failing, the computer won’t be able to adjust this mix correctly. Also a clogged fuel filter can cause similar symptoms. Combine the two and you are in a world of pain. A new fuel filter is a cheap starting point buddy.

Thanks for the reply Rusty. I have bought a new 02 sensor. Im gonna change it, if it fixes the problem im happy if it doesnt then i will just changed a part that is over 20 years old. I will also buy a new fuel filter since my 1 is still the original im sure.

[GT-R David]

Definitely not the O2 Sensor.
Could be CAS though.