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Unread 05-08-2013, 08:30 AM   #1
nekamc
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1985 CJ7 
 
Join Date: Oct 2012
Location: St. Johnsbury, Vermont
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Firing problems

Ok so I have a 1984 amc 258 in my cj 7 I blew the head gasket so I had a complete gasket kit for the motor installed and had the heads done got it in and went to turn it over and I got a high pitch back fire in piston two took valve cover off and found the pushrods wasn't in correct so fixed that put valve cover on now cylinder one and two aren't firing

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Unread 05-08-2013, 11:19 AM   #2
CJuncky
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1981 CJ5 
 
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Double check your plug wires are in right order. Did you pull dizzy? How did you determine that 1 an 2 aren't firing?

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81 CJ5 258/T18/dana20/ARB locked diffs/33's
80 CJ7 258/auto/d 44 diffs/ 4" lift/rebuild started 80 CJ7 #2 stock(sold)
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Unread 05-08-2013, 02:50 PM   #3
nekamc
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I checked plugs and wires pulled wires off when running piston one two and maybe three didn't changed when pulled
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Unread 05-08-2013, 05:29 PM   #4
CJuncky
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That kind of test isn't 100% for no spark. Try using an old plug in the wire and holding the plug to a good ground. You can use a jumper wire to ground it so you don't have to hold it. I like this method, been bit too many times.You should have a good spark. Did you pull the dizzy out? Also when you had the valve cover off did you turn motor over with coil wire off and verify that all the valves appear to be working properly ? We need more info on what all you have done to this point to better help you figure this out.

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81 CJ5 258/T18/dana20/ARB locked diffs/33's
80 CJ7 258/auto/d 44 diffs/ 4" lift/rebuild started 80 CJ7 #2 stock(sold)
82 CJ7 stock DD
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Unread 05-08-2013, 06:58 PM   #5
Gigemags05
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When I had firing issues my distributor was off 180.

Might not be the case for you though
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Unread 05-09-2013, 07:15 PM   #6
nekamc
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Ok so here's what I have done so far I have taken the valve cover off and turned it over and saw all valves and rods were working. I check all plugs by sticking wire in them and putting them to a ground which all had sparks piston 123 were wet when pulled put different cap on it removed the distributer out of my eagle and my 83 cj 7 still didn't work the compression was 125 with a few ten psi +- it only thing I haven't done is take the coil off and change it.
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Unread 05-09-2013, 08:43 PM   #7
CJuncky
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How old are your plugs? You may need new plugs. Plus it sounds like the timing is off. I would double check that the rotor is pointing to the #1 plug wire when the engine is at top dead center. If you have someone to help you have them crank the engine while you turn the dizzy and see if you can get it to run.

PS
Maybe some others will chime in with other ideas.
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81 CJ5 258/T18/dana20/ARB locked diffs/33's
80 CJ7 258/auto/d 44 diffs/ 4" lift/rebuild started 80 CJ7 #2 stock(sold)
82 CJ7 stock DD
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Unread 05-10-2013, 02:14 AM   #8
BagusJeep
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Compression sounds fine so it is back to basics.

Find Top Dead Centre on the compression stroke for #1. Both valves will be shut and the piston near the top of the bore (as seen / felt through the spark plug hole). The timing marks on the crank will tell you exactly.

Is the rotor in the dizzie pointed at #1 wire?????

It moves clockwise so just make sure your other leads are arranged in the right order clockwise.

Put clean new plugs back in and fasten up. Make sure the dizzie cap is correctly seated, you can get them slightly proud.

Test for spark on #1 plug with an old plug held in the wire and grounded to the block. Does it show a nice crisp spark at regular intervals?
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Unread 05-10-2013, 06:57 AM   #9
Hawk4097
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always remember the firing order for a straight 6 is 1-5-3-6-2-4
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Unread 05-13-2013, 10:06 AM   #10
NEKamc14
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Its kind of hard to forget the firing order when its stamped on the intake manifold
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