Help me solve this blasted Pinging.... - Page 55 - JeepForum.com

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post #811 of 844 Old 07-24-2013, 07:18 PM
whiskeywiz
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Originally Posted by 2Xtreme View Post
79 CJ7, 258 - stock internals
Holley 390, Offenhauser intake, Hooker header...

Jeep has a terrible ping on acceleration/ under load. Had the timing set which improved it a good deal. But mechanic said it was 'about as good as he can get it, probably due to the carb'.

I'm thinking I need ignition improvements to take advantage of the carb.
I've had this thing for 3 years and not been able to drive it much, so I don't even remember if I ever did anything with the wires/ cap/ etc that were on it when I got it.

So my questions are these:
Am I on the right track in thinking I need more spark due to the bigger carb?
Should I start with replacing the stock ignition parts to see if that gets me anywhere?
Or jump into and HEI/ DUI set up?

Thoughts/ Opinions?

Thanks in advance!

2X

I put on an msd igniton. On my third plug gap setting, which has eliminated the pinging during acceleration throughout the gears.

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post #812 of 844 Old 07-24-2013, 07:53 PM Thread Starter
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Originally Posted by whiskeywiz View Post
I put on an msd igniton. On my third plug gap setting, which has eliminated the pinging during acceleration throughout the gears.

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post #813 of 844 Old 07-24-2013, 08:14 PM
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Originally Posted by 2Xtreme View Post
only read the original post!
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post #814 of 844 Old 07-24-2013, 08:16 PM
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and the last post. Looked like a bunch of mumbo jumbo about vacuum settings and yadda yadda? Really? Vacuum settings?

Okay okay, ill go read your 55 pages!
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post #815 of 844 Old 07-24-2013, 08:26 PM
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Sorry bro, cant do it. CRT's and dizzy machines and air to fuel ratios....

Not sure where you're at on this but I have MSD ignition with flamethrower coil. .048 gap works pretty good. .050+ pings when accelerating through the gears. Take it or leave it.
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post #816 of 844 Old 07-24-2013, 09:03 PM
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Quote:
Originally Posted by 2Xtreme

Huh?
If I remember your compression numbers were all but 170 on all cylinders. (No I'm not paging back to look) you would figure if the head gasket was blown between number 1&2 they would not be the same as all the rest. I've seen head gaskets bad and no antifreeze usage, or overheating problems.

Just my thoughts.......

Go find a Wagoneer you will have your 360.
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post #817 of 844 Old 07-25-2013, 04:40 AM Thread Starter
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Originally Posted by 86cj74.2L View Post
If I remember your compression numbers were all but 170 on all cylinders. (No I'm not paging back to look) you would figure if the head gasket was blown between number 1&2 they would not be the same as all the rest. I've seen head gaskets bad and no antifreeze usage, or overheating problems.

Just my thoughts.......

Go find a Wagoneer you will have your 360.
True.
My compression numbers were all 170 except #1 cylinder, which was 160.
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post #818 of 844 Old 07-28-2013, 04:48 PM Thread Starter
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Checked out the distributor per 86's recommendations and found I have no weights/ springs to check out and a small amount of side to side play in the shaft.

I don't know if it is visible/ audible in the vid, but here it is.



My Haynes manual states that any discernible play requires dizzy replacement....

Wheel, Fix, repeat….
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post #819 of 844 Old 07-28-2013, 05:41 PM
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Yes any play side to side I replaced the distributor.
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post #820 of 844 Old 07-29-2013, 05:48 AM Thread Starter
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damn
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post #821 of 844 Old 07-29-2013, 06:31 AM
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Quote:
Originally Posted by 2Xtreme View Post
Checked out the distributor per 86's recommendations and found I have no weights/ springs to check out and a small amount of side to side play in the shaft.

I don't know if it is visible/ audible in the vid, but here it is.



My Haynes manual states that any discernible play requires dizzy replacement....
Hi 2x, it's been a while.

What makes you think you have "no weights/springs"? You have to dig a little further into the distributer to find them.

Did you ever check the advance curve like we discussed weeks ago?

Matt
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post #822 of 844 Old 07-29-2013, 06:53 AM Thread Starter
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Originally Posted by Matt1981CJ7 View Post
Hi 2x, it's been a while.

What makes you think you have "no weights/springs"? You have to dig a little further into the distributer to find them.

Did you ever check the advance curve like we discussed weeks ago?

Matt
You are correct.
I didn't dig any farther into it than pulling the cap/ rotor and checking for play.

When I got to that point I pulled out my Haynes manual for some direction.
I saw no mention of weights/ springs in the text or diagrams.....
(I KNEW I should have grabbed the manual on the way out the door this morning...!)

Never did the curve, because every time I turned around another gremlin reared it's ugly head.... hence the 55 pages of posts....
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post #823 of 844 Old 07-29-2013, 08:32 AM
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I've suspected all along that your distributer was part of the cause of the original pinging problem. A broken/worn out spring, or weights that are sticking from corrosion could well be the problem...at least in my feeble mind.

A simple centrifugal advance test would confirm. Just disconnect the vacuum advance at the canister and plug the hose. Then run the engine up to about 2500-3000 RPM and check the timing. It should read above 20 BTDC at that RPM.

The distributer isn't difficult to pull apart, but it takes patience working with some pretty tiny parts. Here's a few pics to give you an idea of what you'd be getting into.

Good luck,

Matt
Attached Thumbnails
PigDizzy1.jpg   PigDizzy2.jpg   PigDizzy4.jpg   PigDizzy3.jpg  
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post #824 of 844 Old 07-29-2013, 09:18 AM Thread Starter
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ahhh...... so the wights are UNDER the pick up plate.

But, as 86 pointed out, I DO have some play in the shaft.
So that may be a moot point.
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post #825 of 844 Old 07-29-2013, 09:41 AM Thread Starter
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Quote:
Originally Posted by Matt1981CJ7 View Post
...A broken/worn out spring, or weights that are sticking from corrosion could well be the problem...
Even if it only occurs under load?

It revs fine when parked.....
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