I don't know if they are supposed to do this, but they almost sound like valve rattle! Are they supposed to be this loud. They are brand new ACD units. Is this a sign of low fuel pressure or something?

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'92 Astro 350 TBI Edelbrock intake, MSD 6AL, 3.42's, 2.5" exhaust, Flowmaster 40 2 chamber, B&M 2nd stage shift kit, 255 60 R15 tires on AR-727's, Polished & Bored TBI, Custom EPROM in progress

 

?? i dont know but the ones on my holley unit is pretty loud, actually very loud

 

sounds normal to me.

 

They are loud. When you have the hood up and the air cleaner off. Have someone rev up the engine they sound great. You hear that deep injection sound right. As far as the rattle mine do the same thing if you press down on the top of the injector on mine they quit rattleing. I dont know yours might be different but check it out.

>hack at it

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89 Formula Firebird
Red with T-tops
5.0 305 FI
Soon to be a 400sb.