Horrible distortion after new speakers?

[onebigmj]

So I tossed some new speakers in my truck. Nothing crazy just hooked up to preexisting wiring. The only thing I had to do was fix broken wires for the left front speaker down by the kick panel. Everything seemed fine while the ignition is on acc. When the engine is running the speakers are breaking up and are getting terrible distortion. It’s a cheap jvc 490 headunit and mtx speakers. Just cheap stuff from crutchfield. The old speakers didn’t sound great but I never had the distortion issue before. And it’s only the speakers that changed, the head unit has been in the truck awhile. Can anyone give me a direction to go in? 

[Smokeyyank]

Bass blockers might be able to help

 

Have you goofed around with the EQ settings to make sure nothing was out of whack? 

[onebigmj]

8 minutes ago, Smokeyyank said:

Bass blockers might be able to help

 

Have you goofed around with the EQ settings to make sure nothing was out of whack? 

Yeah I messed around with that and it didn’t help. It’s not high quality stuff but it doesn’t sound bad when the trucks parked with the ignition on acc. It instantly sounds like garbage when the engine is running. 

[Smokeyyank]

56 minutes ago, onebigmj said:

Yeah I messed around with that and it didn’t help. It’s not high quality stuff but it doesn’t sound bad when the trucks parked with the ignition on acc. It instantly sounds like garbage when the engine is running. 

 

I'd check the ground for the deck

[Fryedaddy]

Could the speakers be wired backwards or one of the speaker wire backwards? This wld cause distortion