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Old 07-25-2013, 05:31 PM
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SBC 350 Issue

Allright i have a strange issue with my small block chevy 350 motor,

when its run normally I hear a clicking or popping sound, we traced it down the the
second cylinder on the left side of the motor, it seems the cylinder is not firing correctly, or at all actually. the exhaust pipe was only warm to the touch, while the others were blisteringly hot.
I ran the motor with the spark plug wire disconnected from the spark plug, and the motor seems to run better and doesn't pop anymore,

however its running on 7 cylinders and not 8.. and that's not too good for it.

One of the rockers on that same cylinder was just replaced,

It was driven with a loose rocker for a bit. I pulled the spark and it was covered in black sooty substance.
So I put a new spark plug in, and the same issue still occurs.

Is it possible the rocker has something to do with it or is it something else?

Im guessing the black sooty substance might be in the entire inside of the cylinder as-well, if it was covering the plug too,
do these blocks have injectors or ports that can get clogged?

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Last edited by fang_x; 07-25-2013 at 05:37 PM.
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Old 07-25-2013, 06:14 PM
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1st you need to determine if you have fire goin to that cylinder from the distributor thru the plug wire.If not,you have a bad plug wire or distributor cap.Was the plug wet as with gas,or,a dry black soot?
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Old 07-25-2013, 06:22 PM
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Originally Posted by jokerZ71 View Post
1st you need to determine if you have fire goin to that cylinder from the distributor thru the plug wire.If not,you have a bad plug wire or distributor cap.Was the plug wet as with gas,or,a dry black soot?
seemed pretty dry, I'll check for a spark tomorrow, its getting late and i don't want to wake the neighbors

whats strange is that when the spark cap is off, the motor wont make the popping noise. Its only when the cap is on like normal. So its effecting something..
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Old 07-25-2013, 06:31 PM
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Sounds like a bad plugwire.They will make a poppin noise. If you look at it while dark,you will probably see a spark along the wire somewhere especiall if it's close to a ground source.Are you running a carb or EFI?
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Old 07-25-2013, 06:32 PM
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its carbed
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Old 07-25-2013, 06:58 PM
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Ok.that rules out a clogged injector.If the plugwire is firing ok & you are sure you have the rockers adjusted correctly,then the plug is either oilfouling,or,you don't have compression on that cylinder.
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Old 07-25-2013, 07:05 PM
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Quote:
Originally Posted by fang_x View Post
seemed pretty dry, I'll check for a spark tomorrow, its getting late and i don't want to wake the neighbors

whats strange is that when the spark cap is off, the motor wont make the popping noise. Its only when the cap is on like normal. So its effecting something..
It's possible that you have a valve not closing due to damage or rocker not adjusted.When you pull the wire,cylinder is not firing,so,it doesn't have any power to it.Piston is just goin up & down w/o an ignition source.
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Old 07-25-2013, 07:06 PM
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Remove the valve cover and see if rocker arms on subject cylinder are moving the same amount as the rest. Sounds like a bad cam lobe to me.
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Old 07-25-2013, 07:13 PM
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Originally Posted by BOBCRMAN@aol.com View Post
Remove the valve cover and see if rocker arms on subject cylinder are moving the same amount as the rest. Sounds like a bad cam lobe to me.
Or that !!! LOl.I just reread the pary bout the noise stoppin when he removed wire. Fang,didn't you just recently have a post about your rockers,or,maybe it was a stud pulling out?
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Old 07-25-2013, 07:18 PM
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Yeah, i replaced it with a threaded one, im going to check the lash tommrow, my freinds advice on just tighten the rockers untill they don't move might not have been so useful. I'll have er fixed soon enough
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Old 07-25-2013, 07:40 PM
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Not good advise @ all.It ain't quite that simple.Now I don't feel so bad.LOL.
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Old 07-25-2013, 07:41 PM
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If you didn't have a bad lobe,you very well may have now.
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Old 07-25-2013, 08:20 PM
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Quote:
Originally Posted by fang_x View Post
Yeah, i replaced it with a threaded one, im going to check the lash tommrow, my freinds advice on just tighten the rockers untill they don't move might not have been so useful. I'll have er fixed soon enough
All it needs is the rocker(s) adjusted correctly.

Basically, you:
  1. Turn the engine over to put the cam to where the valve is completely closed and the lifter is on the "base circle" of the cam.
  2. Loosen the rocker arm until there's clearance between the pushrod and rocker arm.
  3. Tighten just until the clearance is removed and NO MORE. This is "zero lash".
  4. From there, simply tighten the rocker nut an additional 1/2 to 3/4 turn and that's it.

Details on this can be seen here.

Good luck.
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Old 07-26-2013, 09:06 AM
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Allright thanks for the advice guys, i''ll be wrenching later on today. Im a very hands on learner, and its the first time ive tackled any kind of motor work really, there's bound to be a few misfires along the way :3

i'll do what this guy did for each rocker, i'll make sure they are all good.

http://youtu.be/piifbQtCzno

Should i remove the intake manifold for this? or can it be done with it still on?

Last edited by fang_x; 07-26-2013 at 09:14 AM.
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Old 07-26-2013, 10:14 AM
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Quote:
Originally Posted by fang_x View Post
Allright thanks for the advice guys, i''ll be wrenching later on today. Im a very hands on learner, and its the first time ive tackled any kind of motor work really, there's bound to be a few misfires along the way :3

i'll do what this guy did for each rocker, i'll make sure they are all good.

How to Properly Adjust Valves on Roller Rocker Arms - YouTube

Should i remove the intake manifold for this? or can it be done with it still on?
Didn't have a chance to watch video but if you're adjusting the valves, you do not need to remove the intake. Just remove valve covers.
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