85' CJ Ignition problem - Page 2 - JeepForum.com

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post #16 of 24 Old 09-12-2012, 05:33 AM
Hawk4097
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Go buy a compression gauge. They arent that expensive. remove all your plugs and wires(label the wires so you know where to put them back to) screw in the compression gauge into each cylinder have someone turn the engine over while you read the gauge. if you have little to no compression at any cylinder you could have a stuck valve or a hole in your piston or even bad piston rings.

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post #17 of 24 Old 09-12-2012, 07:16 AM
Oldcraneguy
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You have spark and gas, the only things left are compression and timing. Get a compression tester and check all cyls, if theyre uniform (+ - 10 lbs) then its a timing problem. If thats the case pull the distributor (making a note as to where the rotor is pointing) and check the drive gear. If compression is all over the place (20-100) its time to pull the front off. If you find chewed up gears you also need to pull the valve cover and check for bent pushrods and and pay close attention to the valve stem height, I would pull all the rockers and look for any valves that arent all the way up (1/8" makes a big difference) I think I might be getting ahead of things here, do your comp check and get back to us... good luck...ocg
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post #18 of 24 Old 09-16-2012, 03:22 PM Thread Starter
msgrogan
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#1 = 110-115 lbs
#2 = 110-115 lbs
#3 = 90-95 lbs
#4 = 120-125 lbs
#5 = 120-125 lbs
#6 = 110-115 lbs

Going to check to see if the timing is off and how to get it in the correct order. What makes the timing jump? Should I get a new belt or distributor once I get the timing fixed so it won't happen again?
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post #19 of 24 Old 09-16-2012, 05:24 PM
86cj74.2L
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Was those numbers with all plugs removed and throttle held wide open.
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post #20 of 24 Old 09-16-2012, 06:23 PM Thread Starter
msgrogan
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Quote:
Originally Posted by 86cj74.2L
Was those numbers with all plugs removed and throttle held wide open.
No throttle was not wide open.
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post #21 of 24 Old 09-16-2012, 06:33 PM Thread Starter
msgrogan
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Going to replace ignition control unit next weekend just to rule that out. Probably going to take it to a mechanic to adjust the timing if that doesn't work. Don't want to tackle that job.
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post #22 of 24 Old 09-16-2012, 08:27 PM
86cj74.2L
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Held wide open throttle with all plugs removed and battery at 100% is proper way to check compression.
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post #23 of 24 Old 09-17-2012, 05:33 PM Thread Starter
msgrogan
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Quote:
Originally Posted by msgrogan
Going to replace ignition control unit next weekend just to rule that out. Probably going to take it to a mechanic to adjust the timing if that doesn't work. Don't want to tackle that job.
Replaced ignition control unit. Same scenario. Its heading to the mechanic this weekend. Pretty sure it's a timing issue. If I continue to keep the ignition engaged it sounds like it's running. As soon as I let off it stops.
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post #24 of 24 Old 09-24-2012, 05:11 PM Thread Starter
msgrogan
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Quote:
Originally Posted by msgrogan

Replaced ignition control unit. Same scenario. Its heading to the mechanic this weekend. Pretty sure it's a timing issue. If I continue to keep the ignition engaged it sounds like it's running. As soon as I let off it stops.
There was a ignition kill switch underneath the dash. Started tugging on wires and found a heavy gauge wire that came loose from its barrel connector. Fired right up!
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