Hi guys im in need of SERIOUS help. Had it taken to a shop two times. First time they regrounded everything and today reran new rca wires. I STILL GET ENGINE NOISE!!! I have a Eclipse avn 5510 with polk db components with a infionity amp powering it. Also have a fosgate p3 and amp sub system hooked to a 4.0 farad performance tekhnique cap. Everything is good but when volume is low i get a light hissing sound and engine noise. Any ideas on what i can try? Tired of paying to have it looked and not solved.

 

Sorry if you already checked for these things but I'll suggest some,

-all grounds are the shortest length they can be, grounded to an area free of paint, and are of the same gauge as the power wire going in?
-check the head unit ground(stock or aftermarket, either way)
-try a ground loop isolator(easy but not guaranteed or a proper fix)
-using high quality twisted pair shielded RCA's?
-try removing components and seeing if the noise still occurs(remove cap, test, remove amp, test)
-does it occure with the engine off?

 

I had a slight problem until I used a ground wire kit for the engine bay.

 

I would check to see if the noise is there with the receiver out of the dash.

I had a noise that I could not figure out, after checking grounds, etc i realized that the noise was not there when i had the receiver pulled out of the dash, so just for giggles i took some aluminum foil and neatly folded and placed it inside of the dash along where the back of the receiver was. to my surprise the shield actually worked and I have had no noise since. cheap solution to a very annoying problem, if the noise is only there when in dash.

 

Howd you wrap foil paper around it? isnt that bad by all those wires?

 

get rid of the cap

 

Isnt that suppose to be a good thing? I also get a loud hissing sound as if speakers are up all the way with a pause going.

 

Did a direct ground, still same issue.