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Old 02-19-2013, 02:24 PM   #1
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Exclamation 98 jeep wrangler blowing black smoke from exhaust.

Ive hydrolocked the jeep 3 times. pulled the plugs, turned it over, put plugs back, started right up. ever since the last time i did it it runs terribly. it idles way down at a stop then revs up all of a sudden then goes back down. it randomly sputters and looses power when im taking off from a stop and sometimes does it when im just driving. It seems to run better if i keep it in a lower gear at higher rpms. and it blows black smoke from the tail pipe every once and a while. Any ideas what the major problem is?

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Old 02-19-2013, 02:30 PM   #2
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Is it the 4.0 or the 2.4l engine? Is this a jeep you just purchased or is this one you owned that just started doing this? Check to make sure the spark plugs are clean?

Im not much of a mechanic but my first two quesitons should help others when trying to help you.

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Old 02-19-2013, 03:03 PM   #3
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Yes, the engine keeps getting hydro locked!
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Old 02-19-2013, 03:28 PM   #4
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Originally Posted by jeepers29 View Post
Yes, the engine keeps getting hydro locked!

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Old 02-19-2013, 04:06 PM   #5
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I think I smell a troll..

First off, user name says 97, title says 98..

Secondly, how in God's name can you be stupid enough or unlucky enough to hydro-lock the engine 3 times?

Third, how could you think pulling the plugs and trying to crank it would help?

Lastly, it's his first post..
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Old 02-19-2013, 04:12 PM   #6
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Who cares if it's blowing black smoke... It's cool when the pickups do it. You'll be the only jeep on the block that can roll coal. XD
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Old 02-19-2013, 07:25 PM   #7
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Quote:
Originally Posted by ob269
I think I smell a troll..

First off, user name says 97, title says 98..

Secondly, how in God's name can you be stupid enough or unlucky enough to hydro-lock the engine 3 times?

Third, how could you think pulling the plugs and trying to crank it would help?

Lastly, it's his first post..
X2. Sure smells like swamp fungus
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Old 02-20-2013, 02:20 PM   #8
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Its a 6cyl. Pulling the plugs and turning it over lets the water out, dry the plugs, put them back in, itll fire right up. i need a snorkle. and it also idles at like 1600rpm when i push in the clutch or have it in neutral. think it could be my o2 sensors? the check engine light goes off and on.
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Old 02-20-2013, 02:31 PM   #9
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You probably have seaweed or a fish in your Throttle body.
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Old 02-20-2013, 03:31 PM   #10
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haha, maybe. doesnt black smoke mean its running rich? i dont know what would cause that.
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Old 02-20-2013, 03:45 PM   #11
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haha, maybe. doesnt black smoke mean its running rich? i dont know what would cause that.
If the black smoke is from fuel then maybe. But if the smoke is from oil, then you have some cyl/piston or gasket issues. Get a whiff of the smoke.
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Old 02-20-2013, 03:49 PM   #12
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It is probably white smoke which is steam, which is probably a cracked head or exhaust seat cracked. Did you overheat it and warp the head?
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Old 02-20-2013, 03:58 PM   #13
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So, what you're saying is, you've sucked water in through the intake and hydro-locked it. 3 times.
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Old 02-20-2013, 04:01 PM   #14
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So, what you're saying is, you've sucked water in through the intake and hydro-locked it. 3 times.
oh don't for the the seaweed and nemo in the throttle body.
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Old 02-20-2013, 05:47 PM   #15
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Quote:
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If the black smoke is from fuel then maybe. But if the smoke is from oil, then you have some cyl/piston or gasket issues. Get a whiff of the smoke.
I think he's gotten a few too many whiffs of the "smoke"
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Old 02-20-2013, 05:48 PM   #16
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What Gets Damaged

  • Although an engine that hydrolocks at idle may simply stop, catastrophic engine failure is likely if an engine hydrolocks while running at speed. The most common result of hydrolock at speed is that the piston rods are deformed; they bend and fold between the piston at their top, which cannot travel upward any farther, and the crankshaft at their base, which continues to travel upward. Absorbing the force of the sudden stop may crack the block, crack the crankcase, destroy the head and shatter the bearings.

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Old 02-21-2013, 06:06 AM   #17
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Water is an incompressible fluid, when you try to compress it in an engine, the engine loses. Every time.

Hydrolocking once, shame on you; hydrolocking twice, shame on me; hydrolocking 3+ times, well, that's just dumb.
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Old 02-21-2013, 02:17 PM   #18
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It is probably white smoke which is steam, which is probably a cracked head or exhaust seat cracked. Did you overheat it and warp the head?
Its completely black smoke.

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