Valve Noise

Sounds like a lifter bit the dust.

If it were the valve hitting the piston, you would know it. You sould hear the chunks of metal clanging around in the bottom end.

Worst case scenario, if you did isolate which cylinder it is, remove both intake/exhaust rocker arm, and disconnect that injector from the harness to make your 8 hour drive, just drive with sense.
Stan

ScratchinFerTra said:

Worst case scenario, if you did isolate which cylinder it is, remove both intake/exhaust rocker arm, and disconnect that injector from the harness to make your 8 hour drive, just drive with sense.
Stan

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Let's suppose it is a lifter that isn't working or is only partially working. What exactly would happen during an eight hour drive that is avoided by removing the 2 rocker arms on that cylinder. I can't think of any real downside risk of leaving it alone but I'm obviously missing something.

It sounds like a collapsed lifter or bend pushrod to me. Not fun to tear out the entire top end to replace it but that's what you need to do. I wouldn't worry about any catastrophic failure because of it, it will just be very annoying, but that's just my opinion. I've had collapsed lifters before and never had a problem running the car with them, just don't get too throttle happy.

You can possibly try changing oil to something with a lower viscosity to see if it pumps up.

I wouldn't try removing rockers and pushrods. Then you end up with lifters bouncing around in there with no support, possibly damaging the retainers, which could cause a lifter to rotate and you're REALLY screwed. Plus the engine will run horribly with a cylinder that's dead with no valve movement. A dead cylinder is tolerable if the valves are still moving.

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QUOTE=Zero Signal;7707839]It sounds like a collapsed lifter or bend pushrod to me. Not fun to tear out the entire top end to replace it but that's what you need to do. I wouldn't worry about any catastrophic failure because of it, it will just be very annoying, but that's just my opinion. I've had collapsed lifters before and never had a problem running the car with them, just don't get too throttle happy.

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That was my thought as well.

You can possibly try changing oil to something with a lower viscosity to see if it pumps up.

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At one time and perhaps still today one could by high detergent oil to clean engine internals. If it's still available you might try that.

I wouldn't try removing rockers and pushrods. Then you end up with lifters bouncing around in there with no support, possibly damaging the retainers, which could cause a lifter to rotate and you're REALLY screwed. Plus the engine will run horribly with a cylinder that's dead with no valve movement. A dead cylinder is tolerable if the valves are still moving.

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Agreed

Like that one guy said, try the easiest crap first, change the oil and go to a little more viscous(heavier) weight.

If it's still doing it, pull the manifold(s) and inspect THE ENTIRETY of your valvetrain, and dont just eye-ball the rockers. I mean check everything, the spider, dogbones, each lifter, each pushrod, and each rocker.

And take your time with it, ~8 hours with minimal rest-stopping can be hell on a motor.