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R34 Losing Power

kyle345
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kyle345 Enthusiast

kyle345

Posted
Posted

Ok to keep it simple as possible with no confusion

I own a R34GT Auto

For some reason when i press the accelerator the car feels heavy like its struggling to get power, the revs dont go up in sync with when i press the pedal, almost goes to the floor before power kicks in but its still very week.

Sometimes it runs fine and this doesnt happen so this tells me its an electrical problem seeing as its intermittent. It seems to only happen on cold starts, and if i start my car hot it seems to be fine sometimes. The performance does not change during driving you have to physically turn the car off and back on.

Ran scan tool and i got these codes.

Engine: P0325 Knock Sensor - B1

A/T: Shift S/V A(P SW)


I doubt its the knock sensor so i think its to do with the transmission code but have no idea what that is.



Car has done 160,000km


Any Ideas????? Cheers

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https://www.sau.com.au/forums/topic/440969-r34-losing-power/
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kyle345 Enthusiast

kyle345

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Posted

I am a mechanic... A knock sensor is not something that would cause power loss.

My theory it is something with the gear box like it is stuck in limp mode or something so maybe the shift solenoid needs replacing. So im thinking thats what shift s/v stands for. "Shift solenoid valve".

Could be wrong im just not sure because this problem does not throw any lights

Ben C34 Grand Master

Ben C34

Posted
Posted

knock sensor could be throwing it into limp mode right?

Maybe.

I don't think it would go into a limp mode as such (doesn't exist) , but would likely be running on the knock maps which are rich and have timing pulled.

And your trans is unhappy.

asps91 Rising Star

asps91

Posted
Posted (edited)

The knock sensor is very delicate on the 3sgte and there have been many counts of them failing once they take a high reading of knock for your information.

Im obviously aware that it is not an mr2, i am just imputing a real world experience i have gone through with simular symptoms. No need to be rude about it mate... We are all here to help after all.

Edited by asps91
kyle345 Enthusiast

kyle345

Posted
  • Author
Posted

Hmm doubt its CAS or AFM. Because its not throwing a primary ign code.

I wonder why its only sluggish when it starts cold but if i start it hot its heaps better.

Thinking about giving it an AT service and replace that solenoid because i know thats the reason why sometimes AT light comes on and gets stuck in 3rd (common problem after they reach 140,000)

But sluggish wise i dont think its the AT

Ben C34 Grand Master

Ben C34

Posted
Posted (edited)

Yes. The f**king knock sensor and the fact your trans is unhappy can't be helping.

Fix the error codes on ecu. That's why they are there.

What do you want to hear?

What do you want to fix?

Also cas or afm won't cause an ignition error code. Problems with the coil packs or coil loom will (that is the ignition system)

Edited by superben
Ben C34 Grand Master

Ben C34

Posted
Posted

21 is ignition code.

What have you seen that says the cas and afm don't have an individual specific code for them? Cos they have their own codes.

Maybe your research isn't up to scratch?

www.skylinesaustralia.com/forums/uploads/post-50241-1260308643.jpg

anyway,do what you want. Ignore the knock sensor code, worry about the converter etc....

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