Rvettej

Also would low fuel pressure cause it to knock or ping???

Rvettej

Well I appriciate your help.....I have to take the wife out before she drives me nuts. If there is anything else you can think of just post it and I will check it when I get back..THANKS>>>>>>>>>>>>>VERY MUCH.

calongo_SS

iTrader: (7)

Yeah, low fuel pressure could definatley casue pinging.

Red99C5

It may have ran fine for 200 miles, but you cracked a piston before that! Why did you crack a piston? Somehow I think the trouble you are having now, is related to the cracked piston you had before. It sounds like you don't have any idea of what your fuel pressure is either. That is your first problem. If you are running F/I, you need a fuel pressure gauge. I would also highly recommend a wide band A/F gauge. Fuel pressure and Air/Fuel ratio is critical with F/I. I suspect that your fuel pump isn't keeping up with the fuel you need is one problem. Or you have maxed out your injectors because they are too small and may have damaged some. I would also recomend checking all of your wiring (MAF, MAP, O2, etc..). Even a bad spark plug wire can cause trouble because the extra unburnt fuel will have the o2 sensors thinking the motor is rich, and make it lean out some to compensate. The best and easiest way to find your trouble is to scan it. Then I would check your fuel pressure and A/F ratio. It sounds like you are running lean.
Also to change the Fuel pump/filter on the 04' you have to drop the rear transaxle. If you are having fuel pressure issues, you may want to look into a Kenne Belle Boost-a-pump. Good luck

Rvettej

My fuel pressure is 58 psi. it has 38lbs injectors I also have the Air/fuel ratio gauge it seems to be fine...The car acts strange...when it is parked you and rev it up to 2000-3000 rpm and sound great and acts great...but put it on the road and it looses power and starts to ping.

calongo_SS

iTrader: (7)

Fuel pressure is at 58 psi at idle? You really need to put a gauge on it on the dyno, or a guage in the car so you can see what it does under load. Are the 38 lb injectors new?
Do you have a wideband a/f gauge in the car? If so, what does it read?

TeeKay

If your first suspicion was rockers, I would do a visual on the valve springs. Cracked or broken maybe? Just a thought.

moeZ28

iTrader: (7)

the pinging, i dont have a clue, but the backfiring and poor idle could be your O2 sensors. are you throwing any codes on the dash?

vettenuts

iTrader: (4)

On the 04, the fuel filter was moved to inside the tank.

If you are running the stock pump, you are likely starving for fuel up top. Pressure at idle or low RPM doesn't matter, I am willing to bet the stock pump can't keep up with those injectors at higher RPM. This may have been the source of your cracked piston issue. If you go over to CF, England Green just did a Paxton install by ECS and one of the first steps is to put in a bigger fuel pump. You also need bigger wires to feed the pump as it draws more juice. Magnacharger, same deal you have to put in a new pump.

Rvettej

I drove the car while watch the fuel gauge and it kept good pressure about 58 lbs...its sending no codes on dash...I also checked the springs and rockers everything looked good. The fuel injectors are about a year old they were put on when I got the supercharger.

Rvettej

Maybe someone can fill in the gap for me now...For the first time I pulled out the plugs......I failed to check these because they are new...but.......They are soild black not a white spot on them....not oily but exhaust pipe black........anyone with some input on that??????

calongo_SS

iTrader: (7)

Are you saying the white ceramic is black? If so that is not good. Maybe post up a pic of a plug or two.

Camaro99SS

iTrader: (4)

This may sound offbeat, but have you checked or cleaned the MAF lately? If you have an oiled filter like a K@N or Holley, forced induction will have a tendency to blow the air filter oil and get on the 2 wires on the MAF. Also, if you're just relying on a $30 air/fuel guage that's just labled rich, lean, and stoich, that's not enough. You need a wideband for accuracy. With boost, you should be right around 11.8/1 air/fuel.

Assuming you are indeed getting 58psi at WOT and running TR6's or a plug that's colder than stock, this sound like a simple sensor issue.

Jason

Rvettej

Yeah the ceramic is solid black....its carbon fouling....The MAF I havent cleaned or anything but during the rebuild something such as carb cleaner or something could have got on it....the air/fuel gauge wasnt a cheap one but it doesnt read numbers...just the rich, lean, stoich.

Rvettej

Sorry I'm having problems trying to post a picture.....file to large or something.

calongo_SS

iTrader: (7)

Open the picture in paint, go to edit then stretch/skew to resize. I think it has to be 100 kb or less.
Is the car using any oil? Do all plugs look the same?
The cylinders were honed with a torque plate before the piston change correct?

Rvettej

All the plugs look the same....the car doesnt use oil but if you get on it it will blow some black smoke that it hasnt been doing before the rebuild...Yeah the block was bored and honed by a professional with a torque plate.

Rvettej

Hope this is ok

Rvettej

It looks redish like its running lean...maybe from the flash....BUT IT is soild Black

calongo_SS

iTrader: (7)

I'm not too sure what to say about that, I've never seen a plug look like that.
Might want to take a look at the maf like someone else said. You can clean it with some contact cleaner or very gently w/ alcohol and q-tip. Your a/f sensor is also not ideal for accuracy.