79 400m noise
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Junior User
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79 400m noise
79 4oo m heads just rebuilt. but the driver side side make a tapping noise and noise is louder behind front tire towards the tranny. exhaust smokes when engine been running for awhile. when i give it gas and rpms climb it sounds like a deisel truck for some reason? i'm lost. all plugs and wires, cap and rotor replaced. help!!
Postmaster
Joined: Aug 2001
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From: Delaware
Originally Posted by beartracks
White smoke could also be tranny fluid if the modulator is ruptured. It would suck tranny fluid into the manifold.
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Junior User
Joined: Sep 2007
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Its A 4-speed, Where Would The Fluid Come From? I Smell Gas Fumes Really Good While Driving, Does This Mean Anything? JUST CHECKED PLUGS #5 CYLINDER IS BLACK REST LOOK BRAND NEW. COMPRESSION IS FINE. WHEN HEADS WHERE REBUILD THIS CYLINDER NEEDED VALVE REPLACED NOT SEETING. WHAT WOULD CAUSE THIS?
Last edited by polky; Sep 7, 2007 at 08:30 AM.
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Lead Driver
Joined: Nov 2000
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From: Albuquerque
The tranny fluid reply is only for automatics.
It would appear you have identified the problem area. I would look closely at the valve geometry for that cylinder. Make sure the push rods are seated and are not too long as they are not adjustable without shims or different rods.
If the valve is held open it will burn. Also make sure you have spark to that plug.
Good luck.
It would appear you have identified the problem area. I would look closely at the valve geometry for that cylinder. Make sure the push rods are seated and are not too long as they are not adjustable without shims or different rods.
If the valve is held open it will burn. Also make sure you have spark to that plug.
Good luck.
Postmaster
Joined: Aug 2001
Posts: 4,270
Likes: 5
From: Delaware
If the plug is wet with fuel, it means that the cylinder isn't firing.
That could be low compression or no compression or no spark. You should have seen a problem with that cylinder when you took the compression test. Check your plug wires and your firing order again.
That could be low compression or no compression or no spark. You should have seen a problem with that cylinder when you took the compression test. Check your plug wires and your firing order again.
Elder User
Joined: Aug 2004
Posts: 620
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From: NE Wisconsin
compression good, black plug means it's firing, but possibly rich? Could it be a problem with the exhast valve not opening far enough/long enough? Sounds like a valvetrain problem, only being on one cyl.
Elder User
Joined: Aug 2004
Posts: 620
Likes: 1
From: NE Wisconsin
The tapping noise might be a pushrod and rockerarm slapping together. You will have to take out the rods and measure to make sure they are thee correct length, and roll them to see if they are bent. Look at the rocker to see if the contact pattern looks good.
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