460 smoke and knocking
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Mountain Pass
Joined: Apr 2023
Posts: 137
Likes: 31
460 smoke and knocking
Hey guys. I recently replaced my intake gaskets rebuilt, my injectors did timing cover water pump and new pulleys and belts on my 1994 460.
I think my timing is a little advanced, but if you listen to this video, there’s a knocking or snapping that is happening and that never had happened before. The truck also seems to be smoking quite a bit more than it used to. sort of half together, so not sure if that could be a smog issue. But if you could listen to this video and let me know your thoughts on what that could be.
https://youtube.com/shorts/PQNhRHmc5RA?si=r79wSINk1g_SnF-g
I think my timing is a little advanced, but if you listen to this video, there’s a knocking or snapping that is happening and that never had happened before. The truck also seems to be smoking quite a bit more than it used to. sort of half together, so not sure if that could be a smog issue. But if you could listen to this video and let me know your thoughts on what that could be.
https://youtube.com/shorts/PQNhRHmc5RA?si=r79wSINk1g_SnF-g
Thread Starter
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Mountain Pass
Joined: Apr 2023
Posts: 137
Likes: 31
Timing is 12 degrees advanced. Yes I used a timing light, which is within the 10-13 degree specification.
injectors got new o rings, filters, and spacers. I’m sorry that was so tricky to understand.
found some Loose exhaust manifold bolts, which indicated an exhaust leak. That helped mostly to resolve the issue. There is a little bit of valve clatter issues. I will be going back in though, as my china wall seal did not hold on the front of the new intake manifold. I used the rtv as specified, instead of using the rubber end gasket but it did not hold.
the smoke was due to a fuel pressure issue, one of the injectors was leaking and the system i am assuming was over compensating and caused the truck to run rich. After about 3 minutes of driving that resolved itself.
I’m a 19 year old kid fully rebuilding my truck. Sorry I may have asked a dumb question, but to me that’s the only way to learn.
injectors got new o rings, filters, and spacers. I’m sorry that was so tricky to understand.
found some Loose exhaust manifold bolts, which indicated an exhaust leak. That helped mostly to resolve the issue. There is a little bit of valve clatter issues. I will be going back in though, as my china wall seal did not hold on the front of the new intake manifold. I used the rtv as specified, instead of using the rubber end gasket but it did not hold.
the smoke was due to a fuel pressure issue, one of the injectors was leaking and the system i am assuming was over compensating and caused the truck to run rich. After about 3 minutes of driving that resolved itself.
I’m a 19 year old kid fully rebuilding my truck. Sorry I may have asked a dumb question, but to me that’s the only way to learn.
FTE Chapter Leader
Joined: May 2006
Posts: 12,340
Likes: 1,314
From: Central Mississippi
Don't sweat the all caps, we were all newbies of one sort once.
Do find a timing light & set it back to 10* with the SPOUT plug removed.
Carbon build-up sometimes makes the compression go up in an older engine & higher timing causes detonation problems.
Do find a timing light & set it back to 10* with the SPOUT plug removed.
Carbon build-up sometimes makes the compression go up in an older engine & higher timing causes detonation problems.
Hotshot
Joined: Jul 2020
Posts: 10,502
Likes: 2,651
From: Near Salt Lake City
10 degrees is the timing spec not 12 or 13
But 12 is close enough that the engine should not spark knock
Good luck
It's possible your injectors are not squirting enough fuel and that is the knock
You can monitor the fuel pressure as you manually fire each injector for a test
But 12 is close enough that the engine should not spark knock
Good luck
It's possible your injectors are not squirting enough fuel and that is the knock
You can monitor the fuel pressure as you manually fire each injector for a test
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