[JBIGBOOTSY]

I started putting a set of heads on my car and discovered a series of nasty marks, dents and craters on the surface of #3. I ground them smooth and lightly sanded over them. I think they were the culprit of a random part throttle pre ignition problem I have been having. When I'm done I'll head to the dyno and post resullts.

[Hunt_chevs]

when doing my top end rebuild, i removed a gang of shit of my piston, cleaned them up to like new condition, and it solve many probs. i had.

let us know how it turns out,. im curious

[fogged306]

They also could have been the result of the problem you were having.

[ryans88gt]

Originally Posted by JBIGBOOTSY I started putting a set of heads on my car and discovered a series of nasty marks, dents and craters on the surface of #3. I ground them smooth and lightly sanded over them. I think they were the culprit of a random part throttle pre ignition problem I have been having. When I'm done I'll head to the dyno and post resullts.

EGR?? If it isn't functioning, but the computer thinks it is, the computer bumps the timing during EGR function (part throttle) and it will cause pinging if the EGR isn't actually working. you can buy a little plug on ebay that tricks the computer into thinking the EGR is non-functional.

[JBIGBOOTSY]

Originally Posted by ryans88gt EGR?? If it isn't functioning, but the computer thinks it is, the computer bumps the timing during EGR function (part throttle) and it will cause pinging if the EGR isn't actually working. you can buy a little plug on ebay that tricks the computer into thinking the EGR is non-functional.

I have an EGR delete plate. I finished it up and took it for a spin more power and no pre ignition. AND, my ghetto dremmel fly-cut pistons worked! I has a crowd over at my house for the initial start up, they were all making bets that it would blow up.

[fogged306]

The delete plate and the thing ryans88gt is talking about are 2 different things. The little plug that he's talking about plugs into the connector for the EGR.

[JBIGBOOTSY]

I realize that. I believe the thing ryans is talking about is the EGR simulator, I have no simulator, the trouble code is present so the system runs with the EGR function off due to no signal.

[Arctic Fox]

Originally Posted by ryans88gt EGR?? If it isn't functioning, but the computer thinks it is, the computer bumps the timing during EGR function (part throttle) and it will cause pinging if the EGR isn't actually working. you can buy a little plug on ebay that tricks the computer into thinking the EGR is non-functional.

Damn, i've never heard of this. I got FRPP gt40 lower witch does not have the hole for EGR, so i just left all other stuff untouched so that the CE-light stays off. But i haven't heard any pinging, could that be because i'm running on 93 octane?

[ryans88gt]

But then your CEL is on all the time, so you could have any number of other sensors going bonkers and you would never know. It was only like $20 for the simulator.

Dremmel fly cut pistons?? I got my finger crossed for you, I hope you get that preignition problem fingered out.

[Arctic Fox]

Originally Posted by ryans88gt But then your CEL is on all the time, so you could have any number of other sensors going bonkers and you would never know. It was only like $20 for the simulator.

Just $20? Have to get me one ASAP.