Pinging?

[JT]

Hi all,

I have r33 with no mods except K&N filter. When I am driving and give it full throttle at about 4500 to 5000 rpm and onwards it starts to ping. Why is that? So I back off and then go full throttle again and it doesn't ping, why is this so. Seems like the ecu does not adjust quickly anough and running too lean or something I do not know just a guess. This will happen in 1st 2nd an third.

Why is it doing this. i have done the timing belt and not sure if started after that was installed.

Any hint would be great thanks guys

JT

[Boostzor]

Is this after sitting at a set of lights? most probably its heat from the engine getting into that silly crossoverpipe and making it all hot and thin (how i like my women but not my air). Its only just started because of summer right?

A new intercooler will help but in the mean time i suggest u knock the timing back a little for safetys sake.

[JT]

How do I knock back the timing.

I dont think it is the heat because when I give full throttle the first time it pings and when I stop at the lights I will give full throttle again and then its ok.

Seems like it is notadjsuting the first time properly

Johnathon

PS I have accidently moved the TPS a while ago. But I have set it back up according to the appropiate voltage settings/ oHMS

[Boostzor]

U could try cleaning out the throttle body with a can of carby cleaner. If its sticking this should sort it out.

If ure sitting at the lights and revving its not under load so its not gonna ping.

[JT]

Sorry buddy, What I meant is that I stick it and it pings and when I stop at the lights its ok, Then i stick it again and there is NO more pinging. Throttle body already been cleaned. How do I adjust timing??

So it only happen the first tinme I stick and after that I stick it again and it is ok.

Thanks for your help

[JT]

I thought the r33 adjusted the timing itself.

Thanks

[Boostzor]

Ahhh, not sure, does it??

There is a little thing on the side of the block near the crank called the CAS (crank angle sensor) u shouldnt really mess with this unless u know what ure doing but basically u turn it one way or another to retard or advance the timing. Should have 3 bolts on it and a little bundle of wires coming out of it.

[blind_elk]

JT,

The CAS only sets the base timing (timing at idle). It has a little wheel inside that has 360 little slots in it so the ECU knows exactly where the crank is, and some other varying size slots to tell the ECU which cylinder is coming up. With this info, and info like temp and load (from AFM), the ECU then calculates the correct ignition timing.

You need a timing light to set the (base) timing. I would suggest you go to a mechanic who has a good quality timing light and knows about these cars to get them to check and set the base timing. They use an inductor loop off the igniter module to trigger the timing light. Some cheap timing lights get an incorrect signal and go off prematurely.

[Lozza150]

Use 98 RON fuel (shell optimax or BP Ultimate)

Check you computer (passenger side kick panel) Could be an after market mine's or something....

Change spark plug's to platnium....

if these don't work..... Mechanic Time!!!!

[JT]

I have platinums I will check the ecu out. Maybe I will; just reset it. It seems strange that i stick it once it pings but a minute later after stopping and sticking it again it works fine.