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Unread 06-23-2013, 06:00 PM   #1
dleone
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Going NUTS!!!

Ok. I have a 86 CJ7 with 258.. The jeep ran fine except for a little miss. I decided to tune it up with new basic autolite plugs/plug wires/distrubutor cap/rotor button and fuel filter. got done replacing everything and decided I probably should have let it alone. Now the thing runs VERY rough (missing)and VERY rich??? Why would this happen?? It seems to be missing almost like its out of time? but why all the sudden would it do this?? Do I have to re punch the distributor? I checked and tripple checked all connections and
I have been messing with this thing all day and had to quit before I put a bullet in it.. Please help if you can!!


Semper Fi

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Unread 06-23-2013, 06:07 PM   #2
lucdog
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Double check to insure the plug wires are correct.

B
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1957 WILLYS pickup, needs work.
1973 J 4000,
1978 CJ7 DD.
1979 CJ7 360, TH400/Quadratrac trail Jeep.
1979 J20
1980 CJ5 trail Jeep.
1983 CJ7 pretty weekend and sometimes to work Driver in the summer, My first rebuild, if the Q-trac and 5 are broke, this one is the one to take. its just as capable as the other 2, except nice paint.
1984 Grand Wagoneer, 1 ton axles, great 360/727, and a big a$& tree fell on it .
1989 YJ the CJ to YJ conversion.
2005 TJ Rubicon.
2011 Grand Cherokee Laredo 4x4, Mrs. LUCDOG's DD.
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Unread 06-23-2013, 06:12 PM   #3
dleone
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Did that several times..
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Unread 06-23-2013, 07:52 PM   #4
pman
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Put the old wires back on and see what happens.
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Unread 06-23-2013, 09:09 PM   #5
dleone
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I actually put everything but the old plugs back
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Unread 06-24-2013, 02:26 AM   #6
jp360cj
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Did you check the gap on the plugs before installing?
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Unread 06-24-2013, 03:11 AM   #7
BagusJeep
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Have you got the cap properly screwed down. Believe it or not it is possible to have it in there but not properly in place.
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Unread 06-24-2013, 04:56 AM   #8
CJ7VFR
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Did you check the timing?

Or did any of the vacuum advance hoses come loose? Check the three
vacuum switches on the firewall behind the engine. Sometimes those
can come loose and give you problems.

Also, check that the vacuum advace hose to the dizzy is connected and
not clogged.

If your Jeep was running fairly good before your tune-up, then something
must have either come loose, changed, or you have a bad new part somewhere.

You'll find it. Just go thru everything you did, and triple check!!

Good luck!

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Unread 06-24-2013, 06:16 AM   #9
lucdog
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The only thing you changed that would cause this problem is the plug wires in the wrong location. There is also the possibility of bad parts, not likely thou.

image-2283945969.jpg
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1957 WILLYS pickup, needs work.
1973 J 4000,
1978 CJ7 DD.
1979 CJ7 360, TH400/Quadratrac trail Jeep.
1979 J20
1980 CJ5 trail Jeep.
1983 CJ7 pretty weekend and sometimes to work Driver in the summer, My first rebuild, if the Q-trac and 5 are broke, this one is the one to take. its just as capable as the other 2, except nice paint.
1984 Grand Wagoneer, 1 ton axles, great 360/727, and a big a$& tree fell on it .
1989 YJ the CJ to YJ conversion.
2005 TJ Rubicon.
2011 Grand Cherokee Laredo 4x4, Mrs. LUCDOG's DD.
Lots of parts not for sale, i'm a hoarder.
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Unread 06-24-2013, 11:37 AM   #10
waterdowg
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With owning Jeeps for over 20 years, I have found with the stock ignition to use only Champion copper plugs. My sister had a tune up done on her 96 Cherokee and they used Autolite plugs. It ran like crap, they wanted to do other work. I told them to replace the plugs with Champions. If it didn't fix the issue I would pay for for the new plugs a labor. Well, it fixed this issue.
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Unread 06-24-2013, 08:41 PM   #11
GrnLvs
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Remove spark plugs & make sure they are properly capped. Also check your firing sequence.
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Unread 06-24-2013, 09:23 PM   #12
Dngrs1
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Shoot yourself in the head----you obviously can't work on Jeeps!




Just kidding! Walk away for two days and check--recheck everything you did.
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Unread 06-28-2013, 09:47 PM   #13
dleone
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ok.. I took out the PCV valve and it wil run kinda ok but you obviously gotta keep your foot on it to keep it running.. i shook the valve and it still rattles however when I put the vaccum hose on the valve while the jeep is running it kills it.. I have no idea what the hell changed on this thing.
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Unread 06-29-2013, 05:21 AM   #14
keith460
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That sounds like a vacuum leak to me.

Do you have a vacuum gauge to check for leaks and to use as a diagnostic tool? You may have dislodged a vacuum hose or one of them could have been dry rotted and was about to go and fiddling in and around the engine may have finally cracked it open.
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Unread 06-29-2013, 06:40 AM   #15
thompsoj22
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odd, inducing a vac leak makes it run?

so you pull the vac hose to the pcv and it runs, you plug/install it and it dies?. kinda go's against the basics. do you have an EGR valve? if so make sure it is closed and not hung open and leaking air . im with the majority, it must be in the area you were working, cap, rotor, wires, plugs. "no good deed go's unpunished", you didnt think that your jeep was going to thank you for a little TLC did you?. you will find it, it will be somthing simple. check the nipple inside the cap that conducts the coil voltage to the rotor. consider new parts as "bad". look at cap/rotor closely. ok so i read your first post again, is the choke closed?. this would create a "runs better with vac leak symptom". is the choke working properly?, rich condition is absolutely carb, it missed before the tune, do a compression check or have someone keep it running and pull plug wires one by one to isolate the bad cyls if there are any. yes you may get a little shock but shock therapy has been found to be productive in some human faults.
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