Engine making noise?
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Fleet Mechanic
Joined: Jun 2011
Posts: 1,804
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From: Southern California
Engine making noise?
So recently I've noticed that in the morning when I go to start my 390 (cold start), it fires right up BUT it makes a almost nocking type noise.... It goes duh duh duh ...... Duh duh duh ....... It has a few second pause in between but it also seems to stop once warmed up. Its almost a deep exhaust decible noise doesnt really sound like nocking on metal. I really hope it isn't a bad knock :/ anyone have any ideas?
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Fleet Mechanic
Joined: Jun 2011
Posts: 1,804
Likes: 5
From: Southern California
Already ahead of ya. I have the Lucas stabalizer in there with my last oil change. Few weeks or maybe a month ago. Um I'm going to check my oil level to see if I needto add any. Should I put in a bottle of break in cam oil stuff from Lucas every oil change cuz I heard it has zinc in it or something like that Whig is good for flat tappet cams and I have a newer cam in it and don't wana ruin it ( I broke it in like 8 months ago).?
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Fleet Mechanic
Joined: Jun 2011
Posts: 1,804
Likes: 5
From: Southern California
ok well it was low on oil but even after i put a quart or 2 in and drove it, its still there. I got under the truck and i cant tell if its from the engine or mufflers. To me i think its coming from the mufflers or the X pipe but its to damn loud to hear haha
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Fleet Mechanic
Joined: Jun 2011
Posts: 1,804
Likes: 5
From: Southern California
I just you tubed engine knocks to see what it would sound like and what I'm talking about sounds nothing like what was on you tube. Anyone have a video in particular that should sound like a knock in a 390?
Senior User
Joined: Nov 2012
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Do you have catalytic converters on it? If so it could be a busted cat. Otherwise I'd go with valves. I had a strange knocking in my cherokee once. A month later I ended up with my rods and crank all over the road...
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Fleet Mechanic
Joined: Jun 2011
Posts: 1,804
Likes: 5
From: Southern California
But the thing is I'm not so sure it's a knock. Cuz it seems to be coming from the flow through the exhaust and the engine doesn't seem to be making the noise. And I don't have cats either. Umm ima try to identify the source again when I get home.
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Fleet Mechanic
Joined: Jun 2011
Posts: 1,804
Likes: 5
From: Southern California
and I think I can rule out a tick or engine knock cuz every you tube video I've watched is. Completely different then what I'm hearing. I think it has to do with my X pipe sobim 95% sure it's an exhaust sound from my new system..... I'll get the scope out and listen just in case though .
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