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Old 07-28-2013, 10:23 PM
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chevy 4.3 top end tic ???

Here goes. My brand new vortec engine (2001 4.3l in a 1500 van) has developed a tic. Its mainly audible under load. Its a very defined and sharp
tic. It most definitely sounds like its coming from a head. Consistent with rpm's. What should I look for first. What tests could I do to help pinpoint the source.

The rockers on this engine are not adjustable. They are "positive stop" rocker arms. Is it possible that one may be loose? This engine has @ 15000 miles. The engine was built by a reputable
company that builds and updates engines and sells them off the shelf. A crate engine, if you will. I really dont want it to wear out prematurely.

I know this is a very general question. nearly impossible to pinpoint on a message board. My hope is that it may be common enough that some chevy guru can give me guidance.

Thanks

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Old 07-28-2013, 10:52 PM
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Basics first, have you checked around each exhaust port for a leak? That makes a ticking noise...
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Old 07-29-2013, 04:09 AM
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Does the engine have any misfire to it? A plug wire can make a ticking sound usually accompanied by a noticeable misfire tho.Use a stethoscope or length of gardenhose to your ear to try to pinpoint the tick.Be careful of hot/moving parts tho.Ck for loose bolts/nuts.Also steel trans lines are bad about being close together & producing a ticking sound.
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Old 07-29-2013, 08:19 AM
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Quote:
Originally Posted by 68NovaSS View Post
Basics first, have you checked around each exhaust port for a leak? That makes a ticking noise...

I have not. I will check, but im sure thats not it, its a very defined short sharp
very consistent "click".
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Old 07-29-2013, 08:39 AM
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Quote:
Originally Posted by jokerZ71 View Post
Does the engine have any misfire to it? A plug wire can make a ticking sound usually accompanied by a noticeable misfire tho.Use a stethoscope or length of gardenhose to your ear to try to pinpoint the tick.Be careful of hot/moving parts tho.Ck for loose bolts/nuts.Also steel trans lines are bad about being close together & producing a ticking sound.

The engine is running perfect. I drive it 100 miles a day on many days.
The only problem is the evap system. I damaged an evap line and have not repaired it yet.
The sound is not at all dissimilar to a spark leaking out of an old wire.
Very similar. Short sharp click. But thats not the problem.

I am far more skilled than your average backyard mechanic, and I would even say more so than most ase mechanics, but... I dont have much experience in picking out top end noises. ...I have a auto stethoscope, though I have never used it . Where/and how should I listen with my stethoscope?

I am really leaning something between the cam and valve.
What about a faulty hydrolic lifter? could that cause looseness between the
cam lobe and rocker arm? ... oil pressure is good.

Thanks !
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Old 07-29-2013, 11:44 AM
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I have a stethoscope but a hose seams to work better. I use a 3/8 hard air line from a semi.
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Old 07-29-2013, 01:31 PM
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I have a stethoscope but a hose seams to work better. I use a 3/8 hard air line from a semi.

Yea, mine seems dangerously loud.
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Old 07-29-2013, 04:03 PM
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I would suspect a loose rocker maybe.to be honest,i've never heard a roller lifter go bad to know what it does sound like.I'm sure they do.I've just never personally heard 1.If a lifter wasn't pumping oil it could give some ticking from the rocker & pushrod.Just a thought,what about the coil.I have seen them get hairline crack & give off a tick just like a plugwire.Most things that would give you tic would also most likely give you a miss as well.LOL.I bet the VC's are a PITA to take off.
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Old 07-30-2013, 01:00 PM
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Quote:
Originally Posted by jokerZ71 View Post
I would suspect a loose rocker maybe.to be honest,i've never heard a roller lifter go bad to know what it does sound like.I'm sure they do.I've just never personally heard 1.If a lifter wasn't pumping oil it could give some ticking from the rocker & pushrod.Just a thought,what about the coil.I have seen them get hairline crack & give off a tick just like a plugwire.Most things that would give you tic would also most likely give you a miss as well.LOL.I bet the VC's are a PITA to take off.

There is definitely no miss. Im going to break out my stethoscope tomorrow to
see if I can pin point where the sound is coming from. And yes the valve covers
are tedious on a van!
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