Need Tshooting advice for '82 CJ-5 with iron Duke -
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post #1 of 3 Old 03-23-2010, 01:56 PM Thread Starter
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1982 CJ5 
Join Date: May 2007
Location: San Diego, CA
Posts: 13
Need Tshooting advice for '82 CJ-5 with iron Duke

Need some Troubleshooting advice: Just installed remanufactured Iron Duke using my carb, distributor, etc. When started found several vacuum leaks, replaced Carb gasket and manifold adapter gasket and it seemed to run OK but a bit rough. Discovered had canister vac and carb vent bowl lines swapped fixing that helped, but still ran rough... replaced distributor cap & rotor, smoothed out about 90%. Current problem: Idle is about 1200 RPM, and engine runs smooth, but no power - struggles to get to 45 mph! My suspicion is vacuum advance, but I apply small hand vac pump to the dist vacuum canister and it moves the base plate in the distributor just fine. The vacuum line from the Distributor is connected to the middle port of the Ported Vacuum Switch near the thermostat. I plug the line and port when setting timing, but as soon as I put the vacuum line back on the ported switch, timing goes waayy advanced and engine dies - very difficult to restart because it stays advanced. I suspect one of 3 problems: First, is the vacuum advance connected to the right source? Second, is the ported Switch bad?
or third, is my distributor sticking? Opinions? Thanks in advance! By the way its a CA Jeep so it is stock with smog gear intact...

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post #2 of 3 Old 03-23-2010, 05:47 PM
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1982 CJ7 
Join Date: Oct 2006
Location: Central Virginia
Posts: 1,566
Time for a Jeep hammer moment....

4 cylinder CJ engines use a manifold vacuum for dist adv. The delay valve maintains vacuum advance during sudden throttle openings and the coolant is below 120 the delay valve is bypassed by the vac adv CTO when the temp is above 120.
The cto valve permits manifold vac with the delay function or without the delay function to control the distributor vac adv. When the coolant them is below 120 manifold vacuum at port 1 (top) is applied to port D (middle) a hose then supplies the dist off of port d to the dist.
When the engine temp reaches 120 the vac is ported through the delay valve directly to port 2 (closes to engine) bypassing the delay valve.
Make sure the color side of the delay valve (brown if I remember) is away from the CTO lines not toward them.
(from the manual not from me)

wow they really shrunk...

its not a lot but a good place to start to check to see if your delay valve and CTO are installed/hosed/working properly....


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Originally Posted by twoleos617 View Post
To reiterate for the 1,067th time, when towing...
remove rear axle, xfer in N, trans in 5th, remove neg batt cable, key to Run and go??
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post #3 of 3 Old 03-23-2010, 10:34 PM
wrongway92407's Avatar
1986 CJ7 
Join Date: Nov 2009
Location: Devore Ca.
Posts: 483
Recheck your initial timing, could a tooth off!

My fleet:
86 CJ7 5.7 vortec. 4L60,D44's,OBA,Air tank bumpers w/D rings detroits,4.88,35" bfg, mt's 9500ti warn
86 CJ7 2.5 detroits, OBA 4.56, air tank bumpers, w/D rings,9500I warn 31x10.5x15, Trxus
86 CJ7 bone stock, w/factory 44 never seen the dirt soon to be for sale
87 Wrangler also never seen the dirt.
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distributor , ignition , iron duke

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