I run 93 octane gas and it has a new double timing chain and it still makes a lilttle ping sound wheni floor it in second gear any 1 chould point me in the right direction


85 Z28 305 tpi
3 in flowaster cat back
air foil
superior stage 2 shift kit
3.42 posi

 

You probably had your timing advanced to compensate for timing chain stretch... set it back to about 2* over stock and you should be good... if it still pings go with the stock setting. If after that it still pings, I don't know what to tell ya.

 

Some things that can cause a motor to detonate are
carbon in the combustion chamber, clogged fuel injectors low fuel pressure or flow (lean mixture). Over advanced ignition timing. Wrong heat range spark plugs.
EGR not functioning. (Passages plugged or valve not working)
Bad cooling system ( rad, hoses, water pump, fan etc)

Exessive exhaust restriction.
Low octane fuel Try a different brand at a different station.

I'd start my search with the ignition timing and EGR function.

 

YESTERDAY when before i wrote this post my check engine light came on, and ths mornng i went to check the code it was givng me code 32 i checked wat is code 32 and the book says EGR valve to rplace it ? does any 1 know where is this located the EGR valve

 

It's the lage brass disk looking thing underneath the plenum in the middle of the intake.

 

do not replace it unless you are sure that's what it is, the thing costs about 50 bucks and replacing it does not guaruntee that it will fix the problem. I replaced mine and it still shoots code 32 at me.

 

The EGR valve is mounted on the intake manifold on the passenger sie of the carb. The passage under the valve is probabily plugged up with carbon.

There is a vacuum switch (solenoid) in the vacuum line between the carb and the EGR valve. This could be faulty too.
An easy way to check the function of the valve itself and see if the passage is open is to plug the vacuum line into "full manifold vacuum. This will activate the valve at idle. (It will idle rough)
Now squeeze the vacuum hose (should smooth out.)
There is an EGR control solenoid near the valve mounted on the firewall. That needs to be checked for function too.
Get a Haynes manual for Firebirds #79019(867)
It tells you how to trouble shoot and fix the EGR system.

If it turns out that the EGR passage (exhaust heat riser) passages are clogged up in the intake manifold or cylinder head., you may have to remove the intake manifold and to get the carbon out.