Ticking in #8 cylinder(1965 mustang) - Mustang Evolution

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Old 04-10-2015, 10:43 PM   #1
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Ticking in #8 cylinder(1965 mustang)

Recently I noticed a ticking noise when the car was idling rough. By disconnecting the spark plug wire from the distributor cap, one at a time, I was able to isolate the noise down to Cylinder 8. In an effort to troubleshoot, I first swapped the spark plugs wires(#7 and #8). I then swapped the spark plugs #7 and #8. After both of these steps, the problem remained in cylinder #8.

So my question is what could be causing this? I have read a number of different posts suggesting anything from the plug wire going to ground, to exhaust leaks, to very bad internal issues. Of the possibilities, which ones can I rule out since the noise disappears when I disconnect spark plug wire for cylinder 8.

Any ideas/suggestions would be greatly appreciated.

-thanks
Glenn
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Old 04-10-2015, 11:23 PM   #2
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I'd pull the valve cover and looked at the spring/rocket arm/push rod
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Old 04-11-2015, 02:38 AM   #3
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That. You might also consider taking a length of vacuum hose and using it as a stethoscope to try to isolate where it's coming from. At least you could hear if it is from the valve cover or exhaust.
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Old 04-11-2015, 06:31 AM   #4
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I'd pull the valve cover and looked at the spring/rocket arm/push rod
Thanks for the suggestion. I had already taken off the valve cover and looked at the spring/rocker arm/push rod. I didn't see anything obvious. Also, I figured that if the noise went away when I took away the spark, it couldn't be a loose rocker-arm, could it?

-thanks
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Old 04-11-2015, 08:55 AM   #5
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Could be cylinder 8 isn't getting gas and the tick your hearing from the spark from the plug but I wouldn't leave it disconnected bc then when you do get gas to it it will just pressurize instead of burn

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Old 04-11-2015, 10:50 AM   #6
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Originally Posted by beanocook View Post
Thanks for the suggestion. I had already taken off the valve cover and looked at the spring/rocker arm/push rod. I didn't see anything obvious. Also, I figured that if the noise went away when I took away the spark, it couldn't be a loose rocker-arm, could it?



-thanks

Glenn

It sure could. The valve train runs mechanically from cam shaft -> lifters -> push rods -> rocker arms -> valves. Everything still moves as the engine turns, regardless of spark.
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Old 04-11-2015, 10:59 AM   #7
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It sure could. The valve train runs mechanically from cam shaft -> lifters -> push rods -> rocker arms -> valves. Everything still moves as the engine turns, regardless of spark.
Yes, I realize that everything continues to keep running when there is no spark. My point was the ticking stops when i disconnect spark plug spark. Because it stops when pull the plug wire, that makes me think it isn't a loose rocker arm for instance. I was hoping the fact that it doesn't occur without spark, it would help narrow down what the problem is.

-thanks
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Old 04-11-2015, 11:09 AM   #8
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Originally Posted by beanocook View Post
Yes, I realize that everything continues to keep running when there is no spark. My point was the ticking stops when i disconnect spark plug spark. Because it stops when pull the plug wire, that makes me think it isn't a loose rocker arm for instance. I was hoping the fact that it doesn't occur without spark, it would help narrow down what the problem is.



-thanks

Glenn

Sorry, I misread. I think you're correct, if it stops without spark, I would expect it isn't the valve train.

I would guess the next easiest thing to rule out might be exhaust leak, but I'm not sure. A compression test would tell you if you have an internal cylinder issue.
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Old 04-11-2015, 11:49 AM   #9
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The reason the ticking stops when you remove the plug wire is due to the fact there is no force on the top of the piston from the cylinder firing.


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