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Pinging At 4500 - 5000Rpm

chris pohlman
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Rolls Grand Master

Rolls

Posted
Posted

sparkplugs won't cause detonation, they can but it is highly unlikely in your situation, it almost certainly CAS base timing is advanced, you are not running 98 octane fuel, or it is a fuel issue and is leaning out.

Get it on a dyno and diagnose the issue, don't keep driving it or you WILL destroy the motor.

chris pohlman Apprentice

chris pohlman

Posted
  • Author
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was hoping it was the spark plugs in my mind but have a feeling its not. plus when its idling and about to move forward in 1st.... i can hear a belt squeek in a way, been testing it while holding the brake and letting the clutch out i can hear it more......... its never done it before til this pinging noise.....

this car is my daily car, be hard for me to get around.......... imo ....its really annoying :)

AngryRB Grand Master

AngryRB

Posted
Posted

sparkplugs won't cause detonation, they can but it is highly unlikely in your situation, it almost certainly CAS base timing is advanced, you are not running 98 octane fuel, or it is a fuel issue and is leaning out.

Get it on a dyno and diagnose the issue, don't keep driving it or you WILL destroy the motor.

+1 have a look at the CAS position , see if someones been messing with it.

Rolls Grand Master

Rolls

Posted
Posted

.. imo ....its really annoying :)

having to replace the motor will be even more annoying, do not rev it past 4k and no boost until this is solved, I don't think you realise how serious this is. 10 seconds on full boost with sustained detonation is enough to melt ring lands.

AngryRB Grand Master

AngryRB

Posted
Posted

having to replace the motor will be even more annoying, do not rev it past 4k and no boost until this is solved, I don't think you realise how serious this is. 10 seconds on full boost with sustained detonation is enough to melt ring lands.

yeah! what he said!!:spank:

Rolls Grand Master

Rolls

Posted
Posted (edited)

Exaclty, it'll be your base timing is too advanced or you have a lean out due to stuffed fuel pump, blocked injectors, broken fuel reg or blocked fuel filter.

Stop wasting time with all the other shit and get it to a proper workshop so they can stick a wideband in the exhaust and a timing light on then diagnose it as either timing or fuel.

Edited by Rolls
Rolls Grand Master

Rolls

Posted
Posted (edited)

Would make more sense as it is extremely common for an annoying misfire at peak torque with stock tune skylines.

Pinging sounds like marbles being shaken around in a tin can, misfire sounds like the rev limiter, pop pop pop

Edited by Rolls
MrStabby Grand Master

MrStabby

Posted
Posted

no need for a timing belt, timing light gave me a good reading

Just checking - you realise those two things are unrelated, right? I can't tell from your post.

The cam timing can be off and the spark timing can be fine, and the cam belt can be well past its reliable life, and the spark timing can be fine.

chris pohlman Apprentice

chris pohlman

Posted
  • Author
Posted

misfire sounds like the rev limiter, pop pop pop

it was making that noise heaps when hitting around 4000rpm... and also the pinging noise was just the intercooler pipe hitting the fan. ive replaced with a shorter bracket which pulls it away from the fan and sits nice and close to the timing cover.

i have fixed both problems but im in the proccess of getting a dyno and buying a timing kit, water pump cam belts. i am doing my best here in researching and learning more about the car.

Rolls Grand Master

Rolls

Posted
Posted

it was making that noise heaps when hitting around 4000rpm... and also the pinging noise was just the intercooler pipe hitting the fan. ive replaced with a shorter bracket which pulls it away from the fan and sits nice and close to the timing cover.

i have fixed both problems but im in the proccess of getting a dyno and buying a timing kit, water pump cam belts. i am doing my best here in researching and learning more about the car.

might help to get your terminology right next time, would have give a completely different answer if you said misfiring and not pinging. Completely different things, detonation destroys motors, misfire is just annoying.

The Dan Grand Master

The Dan

Posted
Posted

Elite/Rolls - holding all other things the same, wouldn't hot plugs slightly increase the tendency to ping?

I'm pretty sure a 5 is the hottest plug you can get in that size/thread/depth whatever. The factory listing is a 5. Like Rolls said, most unlikely.

Not impossible though. Usually dieseling is caused by lack of ignition timing or very lean mixtures

chris pohlman Apprentice

chris pohlman

Posted
  • Author
Posted

hmm well i had two sets of problems with the car... noises coming from here and there. The hitting noises were the fan hitting the intercooler pipe making the *tinging* noises .... thats fixed now..... and 4 out of 6 spark plugs were just absolutely f**ked..... i did buy NGK plugs.... good buy, fixed the misfire. currently driving the car at 2500 - 3000rpm. Everything seems to be fine ATM, but you guys have commented on the timing and cam belts, so i will be replacing them when i can.... i have seen the belts and they have seen better days.

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