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Unread 01-24-2013, 02:08 PM   #16
198839
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I'm away from the jeep but there are maybe 3 solenoid looking things on the top of the fire wall side of the valve cover. Its all the stock emission stuff I'm sure.Lots of vacuum hoses going to them that I'm going to change per this thread. I've tried putting my hand around that area trying t feel where the click is coming from with no luck.

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Unread 01-25-2013, 03:20 AM   #17
John Strenk
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The Sol Vac also has an electric part to it that may still be working.
Did you disconnect the wire going to the sol-vac also?

Could the clicking be coming from the PCV valve?
There use to be a PCV Shutoff Solenoid to the PCV but it caused a lot of problems that the dealer had a TCM to just remove the solenoid and replace it with a hose.

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Unread 01-29-2013, 11:54 AM   #18
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Any updates?
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Unread 01-29-2013, 02:14 PM   #19
198839
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Since I started working this stalling problem again I noticed the valve cover was leaking oil bad onto the exhaust manifold. I've changed the cover in the past and its due again. So I pulled the old cover off and I'm waiting for the new one to come in. I also noticed the heater cored is leaking and I'm trying to decide if I want to mess with that since the nut behind the valve cover is accessible now. I just may take the nut off so I don't have to mess with that job now. I can bypass the core for now.

So the stalling problem is on hold till I get the cover back on. I was reading more about the decel valve and the pulse Air tubes. The click I'm hearing and drop in rpm to idle and the follow on intermittent stall/shutoff problem seem to happen when that system activates. There may be a vacuumed leak or malfunction in that system and the computer may be overloaded and shutting off the engine.
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Unread 01-29-2013, 02:20 PM   #20
198839
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Another jeep owner is sending me his old, working sol vac so I'll put that back on. Not sure if that has anything to do with the stalling but since it does stop the idle from dropping to quickly and the idle drop precede the stall who knows.

My Jeep doesn't have the PVC solenoid installed. Just the once PVC valve which seems ok.
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Unread 01-29-2013, 04:34 PM   #21
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My sol-vac on Grammys 86 I do believe is toast. Their is a relay in the harness near the battery that operates the electrical side of it. It (the solenoid) has no power to speak of, so it won't be able to up the idle from a low idle because it can't push against the spring of the throttle return. But under certain conditions it will pop out so that when you leave off the throttle it will hold a higher idle.

I think the adventures under the hood site explains its operation. I keep the idle at 800 or so so I don't even know if I'd notice it.

You could probably plug the vacuum lines going to the air pulse diaphragms (up stream and down stream piping) and see if your idle issue goes away. Those gizmos pump fresh air into the exhaust using the vacuum. I can see a bad diaphragm in those pulsars allowing exhaust into the intake manifold via the vacuum system.

It's been 10 to 12 years since I replaces the leaking heater core in the 86. But it was not.bad at all. A heck of a lot easier then pulling the heater box out of my cummins. (94 Ram). Be ready to replace the old paper ducting.
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Unread 01-30-2013, 09:13 PM   #22
198839
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I found what looks like a small crack in the carb above the stepper valve what do you all think of this?
image.jpg  
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Unread 01-30-2013, 09:18 PM   #23
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Here is another shot it looks like it is seeping fuel and wet around what appears to be a hairline crack in carb housing.
image.jpg  
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Unread 01-30-2013, 09:21 PM   #24
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Any ideas? I thinking of a little JB weld over the cracked area for starters.
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Unread 01-30-2013, 09:24 PM   #25
198839
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Or is this crack an optical illusion and all jeeps have this same wet area after idling?
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Unread 01-30-2013, 09:33 PM   #26
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Spray it off with brake cleaner and watch it while it idles.

A dab of gasket maker world work and may be more gasoline proof.
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Unread 01-31-2013, 03:44 AM   #27
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Interesting find,
I don't think all bbds have this wet area after idleing.

This doesn't look new though but was an original casting fault.
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Unread 02-03-2013, 09:07 AM   #28
198839
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Update,

The click sound is coming from the 3 solenoids on the valve cover. One of them goes to the sol vac.The sol vac was not disconnected like I thought and since it would not hold vacuum it was most likely a vacuum leak source. I also found some pretty iffy looking vacuum lines while going through/changing them out.

The jeep is still running smooth and hasn't had a stalling/shutoff episode the last several times I drove it. Since it is and has been an intermittent problem I'm not sure it's fixed but I'm hopeful.

Thanks again to you all for jumping in with ideas and advice!
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Unread 02-03-2013, 09:10 AM   #29
198839
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Also think the carb crack may not be a crack. When looking at it at idle I don see any active leaking and I would think it would run bad all the time if it was an issue but who really knows for sure, after all if is a jeep...
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Unread 02-03-2013, 08:42 PM   #30
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Delete. Wrong post.
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