2150 questions...

[David Simon]

Just got done rebuilding the 2150 on my 1988 GW and I need to know where one of the hoses attaches. The vent hose off the bottom of the power valve well was disconnected by the PO. He also removed the AIR pump and exhaust tubes. Where should I connect this hose?
Thanks,
David


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98 Cherokee (wife's)
97 TJ with all the goodies
88 GW
TFI Upgrade

[This message has been edited by David Simon (edited February 19, 2001).]

[Ralph]

Going by memory alone (it's too late to go out and look), I believe that hose attached to the charcoal canister.

[reddog]

On my 87 the power valve hose runs to a tee attached to manifold vacuum.

Kerry

[David Simon]

One vote for charcoal canister and one for manifold vacuum. Either one one will probably remove any excess vapors. There is another plugged hose that comes from the top of the manifold just behind the carb. If I hook it to the manifold, is it OK for fuel vapors to go in there? Thanks for your help,
David

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98 Cherokee (wife's)
97 TJ with all the goodies
88 GW
TFI Upgrade

[nograin]

David,
Hunt around in here (search). There are a few vac diagrams, and links to vac diagrams. One in the tech area I beleive.
The illustration of the carb in those diagrams is pretty correct. The tricky one I think is to know that the carb bowl vapors are from the bowl vent ( you probably figured that out). Thats goes to the vapor separator and tehn to the cannister.
The PCV valve goes into the rear of the carb. off of the PCV valve is the main vent line from the cannister. I think the little middle port in the front of the carb goes to the intake manifold. I think thats the one you were talking about. It actuates the powervalve. The other two are ported vac. Ones is for the egr, the other for the distributor via the cto.

[reddog]

<BLOCKQUOTE>quote:</font><HR>Originally posted by David Simon:
There is another plugged hose that comes from the top of the manifold just behind the carb. If I hook it to the manifold, is it OK for fuel vapors to go in there? Thanks for your help,
David
<HR></BLOCKQUOTE>

If you have fuel vapor/liquid at the power valve well then you have a blown power valve. Not uncommon on the 2150. The gasket to seal the power valve could also be leaking. When I last rebuilt the 2150 on my GW the threads on the power valve were quite rough and it did not thread in easily. There should be no fuel from the power valve well. The manifold vacuum supplies the vacuum signal to regulate the power valve function.

Kerry

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87 GW - Stock (but it looks like RiverBeast when I'm sleeping)
TFI upgrade
360,727,NP229

[This message has been edited by reddog (edited February 21, 2001).]

[David Simon]

Thanks for the help, I'm going to hook the small outlet underneath the power valve to the plugged manifold vacuum. The others look to be hooked up correctly according to what everyone has posted. One of the reasons I rebuilt the carb was because there was fuel in the plugged hose coming from the small outlet underneath the power valve. It is running great now but I want to hook everything up correctly.
David

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98 Cherokee (wife's)
97 TJ with all the goodies
88 GW
TFI Upgrade

[David Simon]

OK, one more question. What does the power valve do and should it be straight vacuum or run through one of the controlled vacuum sources?
Thanks,
David

I know, that was two questions.

[nograin]

The power valve allows more gasoline to flow, richening the mixture. (equivalent to roughly 6 jet sizes I think).

When you open the throttle plate, the manifold vacuum below decreases. The power circuit idea is that under load you will increase throttle opening thereby dropping the manifold vacuum. Before the the fuel air mixture will be too lean for a loaded condition. the power circuit kicks in.

The power valve is the on/off switch to trigger open/shut the power circuit.

The best explanations I've seen are in the SA Design Tuning Holley Carburators book.

Here a some links that may help.
www.bob2000.com/carb.htm (http://www.bob2000.com/carb.htm)

Holley's website has explanations on how carbs work if you dig down to it (but no diagrams like the book by Ulrich and Fischer)

Power Valve? http://www.ifsja.org/ubb/Forum2/HTML/000643.html

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360 727auto-trany, NP229
body by beer (PO) http://www.ifsja.org/ubb/frown.gif
carries wood inside
no "wood" outside
My other car is a fish

[This message has been edited by nograin (edited February 21, 2001).]

[David Simon]

Thanks for the links. I think I've learned everything I know about carbs in one week, starting with my first rebuild. I'll hook the vacuum up this weekend, can't wait to see the results. It has been disconnected and plugged since I bought the beast.

I'm always amazed at the amount of knowledge in this forum.

David

[Langdon]

One more thing, David...
The manifold vac nipple just behind the carb prolly goes to the thermostatic switch that operates the air cleaner door (and on yours, there's prolly another door just to keep vapors in when engine is off). Look at vac diagrams, this is the TAC switch.
Hope this helps...

[archiele]

Ok, I am just glad that I have a '65, and don't have to fiddle with such pia's.

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Currently a 1965 Wagoneer
bone stock.
'88 Zuki
'75 Mercedes-Benz (wifies resto project)
http://homepage.mac.com/archiele/

[David Simon]

Consider yourself lucky, archiele.

Langdon, the PO disconnected both of them too. He must have done something to the vapor block because it stays open all the time.
Thanks,
David