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Old 01-01-2011, 12:37 PM   #15
a k
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Re-adjust the valves. I let it run, loosened up, let them pump up, tighten to quiet and then 1/4 turn tighter.
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Old 01-01-2011, 06:20 PM   #16
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What was the seat pressure on the valve springs? How did you adjust the valves? Have you taken the valve covers off and rotated the engine by hand and see if the valve train is moving up and down and is consistant?
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Old 01-01-2011, 09:14 PM   #17
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did you have the intake manifold re-surfaced? All it takes to lean one cylinder out and cause detonation in one cylidner is an AIR LEAK on the intake manifold. Had that exact problem on a truck 350, hadnt been torqued properly and leaked so badly that 4/6 burned white out the exhaust manifold, and there was black oil deposits inside the intake runner.

Every mating surface has to be reground or its unlikely they will seal.


Look at the exhaust manifold, is it a different color than the rest on E7?
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Old 01-02-2011, 01:37 PM   #18
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Originally Posted by davecampbell View Post
did you have the intake manifold re-surfaced? All it takes to lean one cylinder out and cause detonation in one cylidner is an AIR LEAK on the intake manifold. Had that exact problem on a truck 350, hadnt been torqued properly and leaked so badly that 4/6 burned white out the exhaust manifold, and there was black oil deposits inside the intake runner.

Every mating surface has to be reground or its unlikely they will seal.


Look at the exhaust manifold, is it a different color than the rest on E7?
Ill Check that for an air leak and the plug to see hows it it burning., I did have the intake resurfaced as well, they wouldnt match up if i didnt, guess they took a bunch off the reads..

Thanks
Jason
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Old 01-02-2011, 01:40 PM   #19
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What was the seat pressure on the valve springs? How did you adjust the valves? Have you taken the valve covers off and rotated the engine by hand and see if the valve train is moving up and down and is consistant?
I adjusted the valves when I built it, when the intake was off and turning the
indavidual push rods till i had a lil slack, I was told NOT to adjust these valves while the motor was running.
I have sence had a shop do it but I dont know how they adjusted them!
But I'll take off the cover and check! I dont know what the seat pressure was/is !

Thanks jason
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Old 01-02-2011, 01:42 PM   #20
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Re-adjust the valves. I let it run, loosened up, let them pump up, tighten to quiet and then 1/4 turn tighter.
I was told not to adjust these valves while running! Was I told wrong?

Jason
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Old 01-02-2011, 01:44 PM   #21
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You might try removing #7 plug wire for diagnosis (as well as #8&5), if the sound changes when that cylinder is not firing you've at least isolated the problem. A loose bolt(s) between flex plate and converter can also cause a rattle.
It doesnt do it while ideling I have to drive it and usually at higher speed and up a hill
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