Piston problem

JBIGBOOTSY · April 26th, 2008, 10:34 AM

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 · April 26th, 2008, 03:01 PM

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 · April 26th, 2008, 09:09 PM

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

ryans88gt · April 26th, 2008, 10:59 PM

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 · April 27th, 2008, 12:32 AM

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 · April 27th, 2008, 01:48 AM

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 · April 27th, 2008, 02:05 AM

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 · April 27th, 2008, 07:20 AM

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 · April 27th, 2008, 01:46 PM

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 · April 27th, 2008, 02:54 PM

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.

April 26th, 2008, 10:34 AM	#1
JBIGBOOTSY Hardcore Enthusiast 1990 LX hatch Join Date: Aug 2006 Location: Hobart Indiana Posts: 2,064	Piston problem 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.

April 27th, 2008, 01:46 PM	#9
ryans88gt MM Fanatic Join Date: May 2007 Location: Bloomington, IL Posts: 3,768	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. __________________ 89 LX 515 hp 497 ftlbs 11.3 @ 125 mph 88 GT 11.4 @ 118

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April 26th, 2008, 03:01 PM	#2
Hunt_chevs Hardcore Enthusiast 88 Gt Not Slow Join Date: Aug 2007 Location: SJ-CA, 50-ft elev. Posts: 1,580	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

April 26th, 2008, 09:09 PM	#3
fogged306 Hardcore Enthusiast 89 GT Join Date: Apr 2007 Location: Happy? Posts: 1,273	They also could have been the result of the problem you were having.

April 27th, 2008, 01:48 AM	#6
fogged306 Hardcore Enthusiast 89 GT Join Date: Apr 2007 Location: Happy? Posts: 1,273	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.

April 27th, 2008, 02:05 AM	#7
JBIGBOOTSY Hardcore Enthusiast 1990 LX hatch Join Date: Aug 2006 Location: Hobart Indiana Posts: 2,064	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.

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