power went bye-bye

[bignblue]

So I'm getting ready to head out to my early class today...start the Jeep (Wag), let it warm up while I get my bags together (backpack, laptop, umbrella and coffee mug--I DON'T travel lightly to school!). It stalls at the first start, as usual, and fires right up the second time and idles happily. However, when I get out on the road the truck dies! No, not my new Waggie! It restarted, but at stoplights I had to slip the tranny in neutral and feed in some gas. My power sucked--that 360 felt like my old Tracker's 80 horse 'power mill' but it ran relatively smooth.

When I got out of class I hurried to check out the Jeep. It started right up, and apart from a slightly rougher idle I couldn't feel any lags in performance. What's up here? To be safe, I stopped at NAPA and picked up a new ignition module--I can ALWAYS use it!

Any suggestions? This is my new baby, and I'd like to keep her healthy.

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'78 Chero WT
401/4bbl/TH400/BWQT
44s F&R
New leafs springs!!!!
no interior to speak of
"Jeep: the toughest 4-letter word on wheels"

New addition:
'91 Grand Wagoneer
"The Drawing Board"

[Gladi8r]

I am no carb guru by any stretch of the imagination, but it sounds too me like the choke needs adjusted. Had the same problems on Wifey's GW and the choke was way outta kilter. It also needed rebuilt so had it all done and runs fine now http://www.ifsja.org/ubb/biggrin.gif

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DON

1988 GW mostly stock, <---Wifey's truck (won't let me "fix it up")

1971 J-4000,Rhino Grille(to be installed)
360 CID 8.5/1 ratio 2v, 245 HP, 365 ft/lb
T-18A, Dana 20, PTO, DANA 44 (Front/Rear)
Soon to be torn down for Resto
71 Gladiator Pics (http://briefcase.yahoo.com/bc/gladi8r1971?d&.flabel=fld2&.src=bc)

78 GW (parts truck)
360 4v Th400
Dana 44 F/R
http://www.j-trucks.freeservers.com/
78 Wagoneer Pics (http://briefcase.yahoo.com/bc/gladi8r1971?d&.flabel=fld3&.src=bc)

[jeeper28]

Ditto on the carb,same happened to me same way!

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360,th400,the big brown turd

[tnhunter]

I have had a similar problem to yours. My 77 Chero will run great until it warms up. Then it stumbles and wants to stall. Sometimes does stall out. If I stop and let it idle for a minute, it smooths right out. Take off and starts stumbling again. Sometimes I barely make it home. This mind you, only after it warms up.

I put a clear fuel filter in line to see if it may be vapor locking. No deal, when stumbling starts, gas is still flowing through the filter. I checked the choke and it seems to be opening correctly after it is warm. I have replaced the fuel filters(twice), fuel pump, rebuilt carburator, new plugs, and coil. I really don't think you have a fuel delivery problem.

Hopefully the new ingition module will help you out. I am trying that next.

[joe]

See if your choke opens back up "fully" when it's warmed up. Sounds like a sticky choke.

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Regards,
-joe
63 2-dr Wag, 73 J-4000, 82 CJ-8

[bignblue]

PO gave me receipts for a carb rebuild two years ago, so I hope it's not due for another! Can I just hit it with some carb cleaner and wiggle things around to free it up?

[nograin]

Can't hurt to try.

If it is the choke, then it may or may not have been done with the rebuild. The bimetal gets weaker after many years. Is there an linkage rod that can be adjusted (by bending)?

[wagoneer one]

You may want to check for intake leaks. MY 84 GW with the 258 did the same thing. After two months back and forth to a lacal mechanic, new carb, and the t.f.i I took some carb cleaner tightend three bolts and she runs like a charm.

It my be running ok at first because the choke is on but after its wide open there is more air then fuel,( my ex-mechanic had my carb adjusted all the way out),and you really notice it when its getting the least fuel,at a stop light.

Hope that helps, Wag one

[This message has been edited by wagoneer one (edited January 12, 2001).]

[This message has been edited by wagoneer one (edited January 12, 2001).]

[bignblue]

Okay fellas--yesterday, I de-gummed the carb w/ carb cleaner. It looked pretty clean, but I figured it couldn't hurt. I also changed the plugs and plug wire just for Great Googley MoogleyGreat Googley MoogleyGreat Googley MoogleyGreat Googley MoogleyGreat Googley Moogleys and grins, and noticed an immediate improvement in the idle. However, driving into Montgomery I came down from highway speeds and boom--started acting up again. Engine was chugging, voltage dropped as did oil pressure--almost to idle specs! I had to keep on the gas to keep from stalling out. 'Zackly how would I go about adjusting the choke?

'Nother thing--when I pulled the old plugs I noticed some were chalky white and others were pretty well fouled w/oil. In fact, the rearmost pass. side plug (don't know cyl #s) was completely black from insulator to tip--what's up here? Bad rings? C'mon, this is supposed to be a reman engine!

[Mike Z]

Hey bignblue, I sorta have the same problem, starting is hard,as with all old Great Googley MoogleyGreat Googley MoogleyGreat Googley MoogleyGreat Googley MoogleyGreat Googley Moogley jeeps http://www.ifsja.org/ubb/smile.gif, but when it runs and warms up it's ok, well except for the exceptionaly loud, valve tap hehe. But when i go somewhere, like a 7-11 or something and come right back out, while it's still warm, the darn thing is harder to start then cold. So checked the carb, man my choke was off the linkage and has no clearence when closed. I haven't got ot it yet, but my haynes manual has complete step by step adj, procedures for all carbs on the cheros/wag/and j series. Looks easy, just takes time and patience, and specific size drill bits and or guage blocks, to set exact clearance. Oh well I hope when i do that and fix annoyingly, loud valve tap, It should fix it http://www.ifsja.org/ubb/smile.gif I hope l8tr
Mike

[andy d]

hmmn, sounds like your idle mixture screws are outta sync. if i have my facts straight one barrel of the 2 barrel carb feeds 4 cyls and the other the other 4. on a factory carb, the idle mixture screws are are set and plugged. im no carb guy, but ill betcha 1 side is too rich and 1 is too lean. why this happenened all of a sudden is strange. pass side cyl bank is even, rear most is 8 iirc. ooh ooh, BB just had a flash of insight, is your egr hanging open? that would give symptoms like you describe. cut off its vacc source and see if the idle returns.

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'88 gwag,pure stock

[nograin]

Andy D
While your following that thought; How do the EGR Exhaust passages run on the 360?

I mean physically do they run through the heads to the rear and then into the intake manifold at the EGR valve? and then does it only feed the back intake runners?

TIA.

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360 auto select
body by beer (PO)
carries wood inside
no "wood" outside

[reddog]

First look at your choke butterfly, when the engine is warm make sure it is open. If that is the case then I would guess that you may well have a blown power valve. It is not uncommon in the 2150. Are you sure your plugs are oil fouled?? Sound like carbon to me as some are clean and with the symptoms you discribed.

On the front lower portion of the carb there is a vacuum hose that I believe attaches to fitting directly on the intake manifold to the rear of the carb. This hose supplies vacuum signal to the power valve. Pull this hose and look for liquid fuel - there should be none. If you have any fuel the power valve is blown. Note that you may not have fuel there and could still have a bad power valve. You should be able to get just a power valve at your local parts place, but since your going to have the carb off to change it open it up and use a can of carb cleaner to blow things out.
The carb on my 87 was a factory reman from the PO and less than 2 years old. When I opened it up to rebuild it (and to replace blown power valve) it had a bunch of junk in it. I am still scratching my head cause 2 months later when I pulled the carb to replace the plastic carb spacer I pulled the top of the carb off to look and more junk. I had replaced the filer before the rebuild so I am not sure how it happened, but I know it can happen!

Kerry

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

[andy d]

i dunno, Nograin. i havent had any reason to mess with the jeeps egr(knock on wood) my experiences stem from plugging a vacuum line to the egr inna 85 merc. car idled crappy before, after plugging ran fine. http://www.ifsja.org/ubb/biggrin.gif

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'88 gwag,pure stock