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Unread 05-09-2013, 02:57 PM   #91
2Xtreme
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Hmmm.... I'm starting to get the picture here. But I am a little confused byt these two posts...

Quote:
Originally Posted by Matt1981CJ7 View Post
...What Shawn and I are suggesting is for you to disconnect the dizzy from the "spark port", plug that port, and find a manifold vac source to connect it to....
And

Quote:
Originally Posted by lucdog View Post
On both of the Quadratrac Jeeps I have/had, the supply is/was hooked up to a small nipple on the intake manifold just behind the carb, not directly to the carb. This was a 304 and a 360. When I installed a 258 in the Jeep I placed a "T" in the vacuum line from the carb to the distributor. You will want full manifold vacuum to the switch/valve in The glove box....
There is a port on the manifold behind the carb. Not sure if my buddy connected something there, or if it is just plugged.
I think what you guys are saying is to us THAT port (with a T) for the distributor AND the Qtrac, plugging the 'spark port' and the port that the Qtrac is currently hooked to.

(obviously the Qtrac thing is secondary. Don't really need it if I can't drive it... lol)

I will get a filter for the intake side of the PCV. But again, not a problem if I can't drive it... Although I do get a lot of steam or smoke out of there, which will probably screw up the filter faily quickly.

86cj74.2L: I have not disconnected the vac advance and driven it

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Unread 05-09-2013, 02:58 PM   #92
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Quote:
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2xtreme, hang in there, man, we'll get it figured out.
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Unread 05-09-2013, 03:02 PM   #93
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Your Q'trac is already hooked to manifold vac, as it should be. Leave it alone.

To supply your dizzy with manifold, you can either T into the Q'trac line, or find an additional manifold port to connect to. Perhaps the one you are talking about in the rear, but you need to confirm it's manifold.

Clear as mud?

Matt
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Unread 05-09-2013, 03:06 PM   #94
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Any port below your carbs throttle plates is a manifold vac source. If you have power brakes you can tap there as well.
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Unread 05-09-2013, 03:23 PM   #95
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Ok, my $.02. At one point I think it was said that a vacuum leak can cause the engine to run hot and ping on acceleration. If so, it seems prudent to check the lines that are on Manifold vacuum going to the Quadratec tranny for leaks. They are probably the original lines and very possibly leaking.

I don't know how the Q'trac works, but if it is possible, pull the line off at the carb and cap it. Then go for a ride and see if the pinging is gone.
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Unread 05-09-2013, 03:35 PM   #96
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Quote:
Originally Posted by Matt1981CJ7 View Post
Your Q'trac is already hooked to manifold vac, as it should be. Leave it alone.

To supply your dizzy with manifold, you can either T into the Q'trac line, or find an additional manifold port to connect to. Perhaps the one you are talking about in the rear, but you need to confirm it's manifold.

Clear as mud?
Yep!

At this point, I think it will be easiest to T into the Qtrac line.

The other port I mentioned is in the intake manifold, so that would definitely be manifold vac. But at this point I figure why mess with it when I can T off the other...
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Unread 05-09-2013, 03:37 PM   #97
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Quote:
Originally Posted by scrapman View Post
Ok, my $.02. At one point I think it was said that a vacuum leak can cause the engine to run hot and ping on acceleration. If so, it seems prudent to check the lines that are on Manifold vacuum going to the Quadratec tranny for leaks. They are probably the original lines and very possibly leaking.

I don't know how the Q'trac works, but if it is possible, pull the line off at the carb and cap it. Then go for a ride and see if the pinging is gone.
I also intend to check for vac leaks using the propane method.
Will probably just temporarily disconnect the Qtrac from the carb and use that for the distributor.
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Unread 05-09-2013, 03:45 PM   #98
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Quote:
Originally Posted by 2Xtreme View Post
Yep!

At this point, I think it will be easiest to T into the Qtrac line.

The other port I mentioned is in the intake manifold, so that would definitely be manifold vac. But at this point I figure why mess with it when I can T off the other...
Actually, I think you should use the available open port. I prefer to have a dedicated line to the distributor over one that shares the vac with other devices. That way, if a leak develops in one of those other devices, it won't affect your advance.

Keep after it....

Matt
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Unread 05-09-2013, 03:56 PM   #99
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Quote:
Originally Posted by 2Xtreme View Post
Thanks, guys....

Let's see.... where did we leave off before the bullying...?

Dslywalker: Elevation where I live is about 325 feet above sea level, so I assume that’s not an issue.

Bkeese: Jeep idles fine. Beautifully, even.
Although I think it idles a little fast.

I believe the mechanic said he retarded the timing as much as he could.

Also, now that you mention the thermostat, I do remember thinking the ping was a lot better when I picked it up from the mechanic, but got seem to get worse as I drove it. So a new t’stat will go in with new plugs/ wires/ cap, etc next week.

I'm still confused if the Q'trac switch should be hooked up to that port on the carb and whether or not my vac advance is hooked up correctly.

Thanks again,

2X
I think just the opposite!!!!!! The machanic advanced it as much as he could, too the point of pinging. I'm saying you need to retard it a little and soon. It may have gotten worst after leaving the mechanic because it got hotter. Heck, cut the center out of the thermostat you have now and put it back in. That's as cool as it will run.
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Unread 05-09-2013, 04:01 PM   #100
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Quote:
Originally Posted by Matt1981CJ7 View Post
Actually, I think you should use the available open port. I prefer to have a dedicated line to the distributor over one that shares the vac with other devices. That way, if a leak develops in one of those other devices, it won't affect your advance.

Keep after it....

Matt
Noted.
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Unread 05-09-2013, 05:40 PM   #101
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Unread 05-09-2013, 05:56 PM   #102
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You should hook up a vacuum gauge and see what you readings are .
At idle, with your altitude, you should have at least 18inHG. And a steady needle if the engine is sound.
Vacuum leaks will cause a lean condition and that can lead to the 'ping'. NOT-GOOD....
To check for v/leaks. Get a spray bottle of VERY soapy water and spray everydangplace around the carb, manifold, lines etc.
If the bubbles disappear and the engine sound changes. You have found your leak.
Good luck,
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Unread 05-09-2013, 06:07 PM   #103
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Propane won't kind a leak in the Q-trac lines. The hose , nipple and steel are so small it would make very little difference if it was left open. The vacuum can barely be felt with a finger over the end.
It won't hurt to take the Q-trac vacuum line out of the equation , just cap it if you do.
The vacuum Actuator has a detent in the rod, so it will stay (or should stay) where it's at when the line is disconnected.
Whenever you have the chance, consider marking the lines for the actuator, apply side (derive), vent, and release side (normal) Use colored tape or zip ties .

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Unread 05-09-2013, 06:15 PM   #104
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You need to remove the vacuum advance hose and plug it and drive your jeep and see what happens to the pinging.

You also need a timing light ( a dial back type is handy)
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Unread 05-09-2013, 06:33 PM   #105
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Quote:
Originally Posted by 86cj74.2L View Post
You need to remove the vacuum advance hose and plug it and drive your jeep and see what happens to the pinging.
I suspect that test will prove little since his pinging is under load.

Quote:
Originally Posted by 86cj74.2L View Post
You also need a timing light ( a dial back type is handy)
Absolutely agree. A timing/TAC/advance light and a vacuum gauge are critical tools to tune these old beasts.

Matt
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