98 jeep wrangler blowing black smoke from exhaust. - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ Tech Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 02-19-2013, 02:24 PM   #1
Newb
 
97 jeep's Avatar
 
Join Date: Feb 2013
Location: indiana
Posts: 9
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?

97 jeep is offline   Quote
Old 02-19-2013, 02:30 PM   #2
Jeeper
 
tkfx's Avatar
 
Join Date: Aug 2012
Location: La Crescenta, CA
Posts: 1,514
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.

tkfx is offline   Quote
Old 02-19-2013, 03:03 PM   #3
Supporting Member

WF Supporting Member
 
jeepers29's Avatar
 
Join Date: Feb 2011
Location: Georgetown, Texas
Posts: 3,749
Yes, the engine keeps getting hydro locked!
jeepers29 is offline   Quote
Old 02-19-2013, 03:28 PM   #4
Jeeper
 
mudmagnet63's Avatar
 
Join Date: Feb 2012
Location: Whiskey River OK
Posts: 556
Quote:
Originally Posted by jeepers29 View Post
Yes, the engine keeps getting hydro locked!

__________________
BAD TOAD

1998 4.0 5 speed, Superior super 35 rear, Superior super 30 front, yukon air lockers x2. 3" Terra Flex suspension lift, 1.25" BL, 1" MML Engo 9K winch, Dick Cepeck Radial F-C 33/12.5/15.
mudmagnet63 is offline   Quote
Old 02-19-2013, 04:06 PM   #5
Jeeper
 
Join Date: Nov 2012
Location: Central PA
Posts: 814
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..
__________________
-Rob

1998 Jeep Wrangler
4.0 : 5 Speed : Green with Black hard top : 33X12.50 Parnelli Jones Dirt Grip's on Eagle Alloy 15x7's : e-AutoGrille's Rock Crawler front bumper with an Engo E9000 with synthetic line
ob269 is offline   Quote
Old 02-19-2013, 04:12 PM   #6
Jeeper
 
Mulvihill64's Avatar
 
Join Date: Jun 2011
Location: Central Jersey
Posts: 359
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
__________________
My Build
Mulvihill64 is offline   Quote
Old 02-19-2013, 07:25 PM   #7
Jeeper
 
Clemson's Avatar
 
Join Date: Jul 2012
Location: Coastal North Carolina
Posts: 98
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
Clemson is offline   Quote
Old 02-20-2013, 02:20 PM   #8
Newb
 
97 jeep's Avatar
 
Join Date: Feb 2013
Location: indiana
Posts: 9
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.
97 jeep is offline   Quote
Old 02-20-2013, 02:31 PM   #9
Jeeper
 
Dextreme's Avatar
 
Join Date: Oct 2011
Location: Oregon City, OR
Posts: 4,749
Images: 1
You probably have seaweed or a fish in your Throttle body.
__________________
'99 Chili Pepper TJ Wrangler "Mistress"
33x12.5 DuraTracs
Zone 4.25"
Dextreme is online now   Quote
Old 02-20-2013, 03:31 PM   #10
Newb
 
97 jeep's Avatar
 
Join Date: Feb 2013
Location: indiana
Posts: 9
haha, maybe. doesnt black smoke mean its running rich? i dont know what would cause that.
97 jeep is offline   Quote
Old 02-20-2013, 03:45 PM   #11
Jeeper
 
Dextreme's Avatar
 
Join Date: Oct 2011
Location: Oregon City, OR
Posts: 4,749
Images: 1
Quote:
Originally Posted by 97 jeep View Post
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.
__________________
'99 Chili Pepper TJ Wrangler "Mistress"
33x12.5 DuraTracs
Zone 4.25"
Dextreme is online now   Quote
Old 02-20-2013, 03:49 PM   #12
Jeeper
 
Blacksurt's Avatar
 
Join Date: Feb 2011
Location: New Mexico
Posts: 164
Images: 1
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?
__________________
Many is a word, that only leaves you guessing.http://www.youtube.com/watch?v=CmKRcN6Fpn4
Blacksurt is offline   Quote
Old 02-20-2013, 03:58 PM   #13
Jeeper
 
Patrick H's Avatar
 
Join Date: Nov 2011
Location: Northern NM
Posts: 3,136
So, what you're saying is, you've sucked water in through the intake and hydro-locked it. 3 times.
Patrick H is offline   Quote
Old 02-20-2013, 04:01 PM   #14
Jeeper
 
Dextreme's Avatar
 
Join Date: Oct 2011
Location: Oregon City, OR
Posts: 4,749
Images: 1
Quote:
Originally Posted by Patrick H View Post
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.
__________________
'99 Chili Pepper TJ Wrangler "Mistress"
33x12.5 DuraTracs
Zone 4.25"
Dextreme is online now   Quote
Old 02-20-2013, 05:47 PM   #15
Supporting Member

WF Supporting Member
 
jeepers29's Avatar
 
Join Date: Feb 2011
Location: Georgetown, Texas
Posts: 3,749
Quote:
Originally Posted by Dextreme View Post
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"
jeepers29 is offline   Quote
Old 02-20-2013, 05:48 PM   #16
Jeeper
 
Blacksurt's Avatar
 
Join Date: Feb 2011
Location: New Mexico
Posts: 164
Images: 1
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.

__________________
Many is a word, that only leaves you guessing.http://www.youtube.com/watch?v=CmKRcN6Fpn4
Blacksurt is offline   Quote
Old 02-21-2013, 06:06 AM   #17
Jeeper
 
Simcraft's Avatar
 
Join Date: Sep 2012
Location: Connecticut
Posts: 43
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.
Simcraft is offline   Quote
Old 02-21-2013, 02:17 PM   #18
Newb
 
97 jeep's Avatar
 
Join Date: Feb 2013
Location: indiana
Posts: 9
Quote:
Originally Posted by Blacksurt View Post
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.

__________________
when in doubt, throttle out
97 jeep is offline   Quote
Reply

Tags
black smoke , hydrolock , problem , running issue

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off




Download our Mobile App

» Featured Product

All times are GMT -5. The time now is 11:22 AM.


User Alert System provided by Advanced User Tagging v3.1.0 (Pro) - vBulletin Mods & Addons Copyright © 2015 DragonByte Technologies Ltd.

Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC