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10-12-2010, 04:44 PM | #1 |
Registered User
Join Date: Feb 2010
Location: Bellefonte, PA
Posts: 81
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What's this noise(w/audio)? Is engine about to die or might this rubber thing be it?
I thought I was making some progress with my 86 c-10 (86 4.3 v6 automatic with 89k original miles). The engine has never run better, started sounding good at idle after I fixed a vacuum leak, the odd knock it had went away after running some seafoam through and changing the oil a few times, the big puff of smoke it gave off on start up went away, and I even tracked down the oil leak from a bad seal on the passenger valve cover. For a few days, all was good. Then, of course, a new noise cropped up that is way different than anything I've ever heard before. I figured I'd record it and see what folks thought.
When I poke around with a piece of hose to my ear, it's loudest up against the oil pan. Some other symptoms - It's not there on startup until I blip the throttle and get it down to low idle. - If I give it a little gas (like in the audio) the noise goes away. - It's not there when driving until I get to really low speed or idle at a light. In fact, the truck runs fantastic at speed. - It seems to be worse in reverse...but goes away as soon as I give it gas - oil pressure is good...40+ psi. I found another thread where someone had a similar description and it turned out the exhaust pipe came loose from the headers. I checked and that's not the case for me but it does sound like a few big hollow pieces of metal clanking against each other rather than something from in the engine (or perhaps thats more a hope on my part). It would just seem that if it were in the engine, it would get worse with speed/RPMs. To add to the mystery, pictured below is a piece of rubber I found in the driveway the other day. It could be from the truck or from somewhere else. Not really sure. Might it be some sort of pad from in a mount or something that would keep two pieces of metal from rattling? So what do you think? Is the engine about to eat itself? Is this rubber thing to blame? Something else? Thanks! Last edited by TimQ; 10-12-2010 at 04:47 PM. |
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