I just bought this car. I dont know if its a rod know or just need a really bad valve adjustment. It is really loud when you turn it on. when I drove it . it ran fine was doing 65 like nothing. It wasn't making a noise at this speed. But at a stop it will dye out. will be doing a compression test tomorrow.

 

rod knock would sound like a hammering noise comming from the bottom of your engine

 

rod knock is also not continuous - it tends to happen under acceleration or load
valve chatter is all the time

 

Take a hammer and hit your block with it. Thats what it sounds like.

 

smart...
thats not really a very good explanation though, because piston slap will sound the same as that too

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by pdiggitydogg &raquo;</TD></TR><TR><TD CLASS="quote">rod knock is also not continuous - it tends to happen under acceleration or load
valve chatter is all the time</TD></TR></TABLE>
thanks

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Rainy City &raquo;</TD></TR><TR><TD CLASS="quote">Take a hammer and hit your block with it. Thats what it sounds like.</TD></TR></TABLE> thanks will try that if its pston splap or rock knock it doesnt matter I just want to know if i should buy a new motor or fix the valve chatter

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by pdiggitydogg &raquo;</TD></TR><TR><TD CLASS="quote">smart...
thats not really a very good explanation though, because piston slap will sound the same as that too</TD></TR></TABLE>

Well he shouldn't be getting piston slap when he's at operating temp unless his motor is on its way out.

 

or perhaps aftermarket pistons that he didnt mention

 

stock motor it sounds nothing like when I hit it with a hammer. can I tell if I take off the head??

 

my waterpump on my Ls sounded just like that, take a flat head screwdriver and put it to where you think the knock is, and listen to through the handle...

 

Sounds like the valves, mine was doing the same thing and dying down when you stop.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by iceman7329 &raquo;</TD></TR><TR><TD CLASS="quote">Sounds like the valves, mine was doing the same thing and dying down when you stop.</TD></TR></TABLE> thats excatly what it does. how can you tell do I pull the head??? or what???

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 92b16si &raquo;</TD></TR><TR><TD CLASS="quote"> thats excatly what it does. how can you tell do I pull the head??? or what???</TD></TR></TABLE>

Pull the valve cover off and bring the #1 piston to TDC and check the clearance on the rockers.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by iceman7329 &raquo;</TD></TR><TR><TD CLASS="quote">

Pull the valve cover off and bring the #1 piston to TDC and check the clearance on the rockers.</TD></TR></TABLE>
thanks will do this tomorrow


Modified by 92b16si at 10:38 PM 4/30/2007

 

is the noise comming from the top or the bottom? I'd check that first

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Crispy &raquo;</TD></TR><TR><TD CLASS="quote">is the noise comming from the top or the bottom? I'd check that first</TD></TR></TABLE>
I cant tell