My R34 Gtr Engine Noise At High Rev

[NISSAN GTR]

Hi was hoping for some help from people in the know

Lately when i give my GTR a squirt the engine makes a slight clattering noise and the engine light flashes on and off very quickly .

The noise occurs only at mid to high rev range about 5500 rpm to 7500 rpm

In the past before the issue with the noise , it did blow a fair amount of black smoke from time to time requiring a re-tune .

Could it be valve bounce ? I need some help !

My cars staying in the garage until i find out a bit more !

Thanks Guys

Edited December 13, 2011 by NISSAN GTR

[The Mafia]

Sounds like detonation. And I'm thinking if you keep it up your engine is going to blow very soon.

Find out why it's detonating and fix it.

[Aggroman]

its detonating/knocking.. take it to your tuner and get a retune/diagnose it..

[Duncan]

Are you running a PowerFC? If so it is detecting pinging and flashing the light as a warning.

If you haven't moved the CAS, changed the boost or anything else it is most likely to be a dieing fuel pump, but get a mechanic to check it out.

BTW no real danger running around at low revs/boost/load. Just don't give it some, pinging can literally kill a turbo motor in seconds.

[NISSAN GTR]

Are you running a PowerFC? If so it is detecting pinging and flashing the light as a warning.

If you haven't moved the CAS, changed the boost or anything else it is most likely to be a dieing fuel pump, but get a mechanic to check it out.

BTW no real danger running around at low revs/boost/load. Just don't give it some, pinging can literally kill a turbo motor in seconds.

Yeah its running Power FC , would 91 RON unleaded cause pinging , my misses might have put 91 in by mistake .

[The Mafia]

Bingo... Is your powerfc tuned?

Seriously... It will blow up if you keep into it, drive it steady.

[levinboy]

Yeah its running Power FC , would 91 RON unleaded cause pinging , my misses might have put 91 in by mistake .

Top up with some 98 then put a bottle of octane booster in it that should help, if it gets worse it may be a bigger problem

[lilcrash]

91 octane will definitely do it. Drain the tank and dump it, 91 octane isn't even good enough for a lawnmower.

[JustinP]

Ouch... That is it. Due to a number of reasons which I won't go into here my R34 had some 91 RON fuel put into it (also runs a PowerFC with no knock protection). Results - dead engine haha. The one upside is I get to rebuild it better, but that has almost been 2 years in making so far...

Drive it really carefully, whilst continually topping it up with 98 RON fuel till its filled with it.

Yeah its running Power FC , would 91 RON unleaded cause pinging , my misses might have put 91 in by mistake .

[The Dan]

The octane rating of your missus is insufficient

[Duncan]

we need pics before we can be sure....

[lilcrash]

I didn't want to be the first to say something. But yes why didn't she know what fuel your car uses??

[wolverine]

we need pics before we can be sure....

Pics would help.....

[Al Despo]

Criminal behaviour lol

[SargeRX8]

I wouldn't even drive the car. Get a siphon and pump that stuff out. 91? Lucky she didn't put E10... 3 successive blinks of the engine check light is a sign of detonation and it must be going hard out. Its not only about driving slow now, its also about not putting much load on the motor. If you tried to climb a hill with that fuel you will find it detonates.

[SiR_RB]

91 octane with 10% ethonol yiewwwwww

get some 98 juice in that sucker !

[Harey]

I wouldn't even drive the car. Get a siphon and pump that stuff out. 91? Lucky she didn't put E10... 3 successive blinks of the engine check light is a sign of detonation and it must be going hard out. Its not only about driving slow now, its also about not putting much load on the motor. If you tried to climb a hill with that fuel you will find it detonates.

yup I agree siphon it out and put it in another car.

[NISSAN GTR]

Pics would help.....

She knows what goes in it 98 , but it was a genuine mistake just from the habit of using 91 in her own car . Women arent perfect like us men . lol

[N1GTR]

Depending on your fuel reg setup, you could unhook the return and put that into a bucket/jerry can, then start the car and let it idle until it stalls. Hook the reg back up and put in 98 - easy as. Did it on my GTR when making the swap to E85 and it didnt take long at all. On a separate occasion did the same thing but used the ECU to turn fuel pumps on and didnt start the engine.

Putting a tube down the fuel filler to syphon the tank is damn hard with a GTR fuel neck and you wont get as much as the fuel pump will anyway. Food for thought

[Dose Pipe Sutututu]

get the hand controller and pull back like -5 across the entire ignition map