InnocentZ28

iTrader: (3)

Just put in a lt4 hot cam with lt4 springs, and electric water pump. when you start the car up when it is cold it is quiet, but when it warms up it has a churning sound like its coming from the optispark. It kind of sounds like a wawahwawawahwa. also the idle will raise up about 200 rpms, by itself, but its got me confused. If anyone has an idea please let me know.

thanks, Josh

396D1SS

iTrader: (21)

can you get any sound clips? im sure we can help you out

InnocentZ28

iTrader: (3)

sorry, but i dont have any way of puting it on the computer.

carzman5678

Do you have a tune to go with the new cam?

InnocentZ28

iTrader: (3)

yea I got it tuned at PCMFORLESS. I forgot to post that up there.

SnakeOiler

iTrader: (6)

Did you put in a new timing chain?

InnocentZ28

iTrader: (3)

Yea i did a lt4 heavyduty timing chain,lt4 springs,lt4hotcam,summit electric waterpump,lt4 knockmodule,and pcmforless tuning.

DeltaT

iTrader: (5)

Did you purge the cooling system of air?

Jim

InnocentZ28

iTrader: (3)

yes I let all of the air out I have drove the car for about a month now, and it drives fine, the noise quits after about 1800 rpms, and the car has great power, just not sure why such a nasty noise, but it runs smooth.

InnocentZ28

iTrader: (3)

Anyone know if the new Accel opti is any good? Im gonna try to buy one i guess

blkchevyz

what year is the car?

doesnt the heavyduty chain only fit 95+

InnocentZ28

iTrader: (3)

its 1997 camaro z28

blkchevyz

did you wire the water pump up with a fuse? if so try unhooking it just to make sure your not hearing coolant moving around.

InnocentZ28

iTrader: (3)

Everything is hooked up and running it is a high pitch sound like wawawawawa coming from the optispark area.

blkchevyz

hard to diagnose a sound without hearing it

air pump? but i thought those ran more when it was cold... been a few years since i've had one.

InnocentZ28

iTrader: (3)

Yea I wish I could post, but i dont have a digital camera to do it. This will probably end up being a spend and no fix, until you buy like a 35 cent part that fixes it all.

jessmansweet

Have you taken your accessory belt off to be sure its not an acc or the tensioner?

DeltaT

iTrader: (5)

Whatever the noise is, I would not drive it at all until you fix it. It is not going to fix itself.

Jim

InnocentZ28

iTrader: (3)

yes I have started it without the belt, so hopefully its just an opti

SnakeOiler

iTrader: (6)

I don't know about a high pitch sound. But my GMPP Extreme Duty chain and gears did add some extra noise to that area.