Cylinder 3 is dead! HELP!!! - JeepForum.com
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post #1 of 11 Old 07-11-2020, 02:19 PM Thread Starter
Toader121
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Cylinder 3 is dead! HELP!!!

1995 yj 2.5l
A few weeks ago my jeep started misfiring very bad while driving. On the way home it would go away and come back sporadically. I changed the spark plugs, started it up and took it for a flawless test drive. A few hours later i went to drive it again, made it a minute down the road and the misfiring began again but this time would not go away at all. I came back home and tried checking a few things. When i pull the injector wires for cylinder 3 the misfire does not change at all. The other 3 cylinders it gets way worse.

So far i have put new spark plugs, distributor cap, rotor, wires and injectors. I tested the compression today and it’s good.

Does anyone have any ideas what to check on next or replace? Thankyou in advance

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post #2 of 11 Old 07-11-2020, 03:39 PM
TSEJEEPERS
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I would pull #3 cylinder plug wire and see if it is getting spark.

93 YJ SOA 2" springs front, XJ springs rear w/main leaf added, High pinon 9 inch rear detroit locker front Dana 44 ARB 4.56 Gears, 36 inch Irok tires too much to list.
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post #3 of 11 Old 07-11-2020, 05:55 PM Thread Starter
Toader121
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I tried that the other day and it is getting spark
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post #4 of 11 Old 07-12-2020, 05:24 AM
Chrisnvegas
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Check the valve springs. They do break sometimes.

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post #5 of 11 Old 07-12-2020, 08:49 AM
jtec
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this happened AFTER you changed spark plugs.
that is where to start,
Why did you change plugs?
What plugs did you use, what gap? Is secondary wire secure? Correct plug routing?


How did old #3 plug look? wet, BLACK, dry, TAN, oil fouled?
If it has started misfiring this soon - remove #3 and 'read' plug.

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #6 of 11 Old 07-12-2020, 05:32 PM
4Low2G0
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Quote:
Originally Posted by Toader121 View Post
When i pull the injector wires for cylinder 3 the misfire does not change at all. The other 3 cylinders it gets way worse.

Try swapping the #2 and 3 injectors, see if the miss follows the injector, if so the injector is bad.

Whats over that next ridge?
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post #7 of 11 Old 07-12-2020, 08:42 PM
Waternut
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I'm also curious what the #3 spark plug looked like after you pulled it out.

I'd pull the valve cover and have a look. Could be a broken spring, bent push rod, loose rocker arm, etc. Should be a quick check. If you don't see anything, it may be worth checking the oil for water as you may have blown the head gasket and coolant is fouling the plug.


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post #8 of 11 Old 07-13-2020, 06:54 AM
EABiker
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Mechanical issues such as valve springs do not come and go; that cannot be the problem. Electrical issues can; check the injector wire/connection very carefully from end to end. A bad connection can "go away" when you handle it, as when you unplug or move a connector, only to come back again from vibration.
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post #9 of 11 Old 07-13-2020, 04:57 PM Thread Starter
Toader121
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Now that i think about it. When i removed #3 spark plug to check for compression there was fresh looking oil on the plug. Didn’t think anything of it at the time. The tip didn’t look any different than the other plugs but if that cylinder isn’t firing i guess it wouldn’t, right? I wish i had looked at the old plugs better. Im still learning from my mistakes lol
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post #10 of 11 Old 07-13-2020, 06:34 PM
jay-h
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Depends how much fresh oil. The oily appearance could be because of the misfire rather than the cause of the misfire.

If you have compression, the issue is almost certain injection or ignition related. (A failing lifter could create the symptom, but it would hammer quite loudly)

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post #11 of 11 Old 07-14-2020, 04:09 AM
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^^^ ya
but confirm it is oil or if it’s gas and oil. A lot of oil and little gas is another issue entirely. And it won’t come and go...
antifreeze instead of oil; again different flow chart

[size=“3”]Shackles & D-rings are different things.
Cranking IS turning over
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