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

 

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

 

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

 

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

 

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

 

Did you put in a new timing chain?

 

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

 

Did you purge the cooling system of air?

Jim

 

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.

 

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

 

what year is the car?

doesnt the heavyduty chain only fit 95+

 

its 1997 camaro z28

 

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.

 

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

 

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.

 

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.

 

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

 

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

Jim

 

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

 

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.