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Unread 12-13-2013, 06:52 PM   #1
huntinbuck
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1993 ZJ 
 
Join Date: Dec 2013
Location: Northfield, mn
Posts: 7
how's it going new from Minnesota

I have been on this site a time or two before looking for answers to problems I have been having but can't find anything on them.

I have a 93 grand limited 5.2 and I am having a couple problems with it that are confusing me.

1. I go start my zj in the morning to go to work it runs fantastic, I have a 20 minute drive to work she warms up before I get out of town. Then the problems start. I'll be driving and it'll cut out often(not misfire) then it stalls and I have to pull over wait a couple minutes and it starts right up no problem. This happens often but not every time I drive it. Wtf is going on with it. On to problem no. 2

2. If I drive for long periods of time(over an hour) the check engine light comes on and I get codes 51 & 52(to rich and to lean). I keep driving after the cel comes on and on light throttle it pulses. Also when I let off the throttle completely it jerks but only when the cel light is on.


If you guys have any suggestions on what it is or where to begin that would be amazing.

I already did plugs and wires cap and rotor.

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Unread 12-13-2013, 10:47 PM   #2
nodoze
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1996 ZJ 
 
Join Date: Jun 2013
Location: TC, Minnesota
Posts: 139
welcome to the forum, nice to see another ZJ from MN
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Unread 12-13-2013, 11:10 PM   #3
Myusername1674
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1995 ZJ 
 
Join Date: Dec 2011
Location: Chattanooga, TN
Posts: 2,214
Hey man, welcome to the forum! As for the first question, I don't have a direct answer, but you should take a look at the "Zj Dirty Dozen" I've linked it there for you, if you haven't tried these I would start there to look for an answer to your stalling issue. As for number two, well that one I really don't know. I'm not very knowledgeable on these kinds of issues, but there are others on this forum that are so hopefully they'll help you out. Good luck
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Unread 12-13-2013, 11:37 PM   #4
xrunndonex
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1994 ZJ 
 
Join Date: Dec 2012
Location: coffeyville, Kansas
Posts: 1,744
Quote:
Originally Posted by huntinbuck View Post
I have been on this site a time or two before looking for answers to problems I have been having but can't find anything on them.

I have a 93 grand limited 5.2 and I am having a couple problems with it that are confusing me.

1. I go start my zj in the morning to go to work it runs fantastic, I have a 20 minute drive to work she warms up before I get out of town. Then the problems start. I'll be driving and it'll cut out often(not misfire) then it stalls and I have to pull over wait a couple minutes and it starts right up no problem. This happens often but not every time I drive it. Wtf is going on with it. On to problem no. 2

2. If I drive for long periods of time(over an hour) the check engine light comes on and I get codes 51 & 52(to rich and to lean). I keep driving after the cel comes on and on light throttle it pulses. Also when I let off the throttle completely it jerks but only when the cel light is on.

If you guys have any suggestions on what it is or where to begin that would be amazing.

I already did plugs and wires cap and rotor.
#1 I'd test crank shaft position sensor they are very commonly replaced.

#2 really don't know

What plugs did you use? also did you change the coil?
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Unread 12-14-2013, 12:13 AM   #5
JasonStebbins
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1997 ZJ 
 
Join Date: Jan 2009
Posts: 3,138
Sounds like both your problems are a bad upstream oxygen sensor. Unplug it and go for a drive to see if they symptoms go away.
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Unread 12-14-2013, 10:32 AM   #6
PolkaPower
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1998 ZJ 
 
Join Date: Aug 2011
Location: The Abyss, MD
Posts: 16,230
Quote:
Originally Posted by JasonStebbins View Post
Sounds like both your problems are a bad upstream oxygen sensor. Unplug it and go for a drive to see if they symptoms go away.
He's only got one 02 on his. It does sound like the 02 though.
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Unread 12-14-2013, 12:11 PM   #7
xrunndonex
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1994 ZJ 
 
Join Date: Dec 2012
Location: coffeyville, Kansas
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Quote:
Originally Posted by PolkaPower View Post

He's only got one 02 on his. It does sound like the 02 though.
Sorry for a thread jack, but can a o2 cause rough idle and some sputtering at times in a 94 4.0. No cel though :/
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Unread 12-14-2013, 02:12 PM   #8
Oldfrog
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1997 ZJ 
 
Join Date: Feb 2008
Location: Louisiana/Texas
Posts: 4,030
Yes, I would think so, but only after it warms up.

Only use NTK o2 sensors, by the way. Do NOT use Bosch.
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Words of wisdom, Posted by Zeejay:
"..it's not air, it is the opposite of air... suckage so to speak."

Stalling? Work through Zeejay's list
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Unread 12-14-2013, 04:29 PM   #9
JasonStebbins
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Quote:
Originally Posted by PolkaPower View Post
He's only got one 02 on his. It does sound like the 02 though.
I never said anything about a second sensor, GET OFF MY BACK POLKA.










Just kidding.

Quote:
Originally Posted by xrunndonex View Post
Sorry for a thread jack, but can a o2 cause rough idle and some sputtering at times in a 94 4.0. No cel though :/
That's exactly what mine was doing for the first two days, then it started stalling.

As Frog said, only use Mopar or NTK/NGK brand on our Jeeps. That goes for all sensors.
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Unread 12-14-2013, 05:29 PM   #10
PolkaPower
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1998 ZJ 
 
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Location: The Abyss, MD
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Quote:
Originally Posted by JasonStebbins View Post
I never said anything about a second sensor, GET OFF MY BACK POLKA.









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Unread 12-14-2013, 05:34 PM   #11
xrunndonex
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1994 ZJ 
 
Join Date: Dec 2012
Location: coffeyville, Kansas
Posts: 1,744
Quote:
Originally Posted by JasonStebbins View Post

I never said anything about a second sensor, GET OFF MY BACK POLKA.

Just kidding.

That's exactly what mine was doing for the first two days, then it started stalling.

As Frog said, only use Mopar or NTK/NGK brand on our Jeeps. That goes for all sensors.
Mines been doing it for months not enough for me to worry because its pretty rare. Only happens on hot days hasnt once happened when it was 40 or below. I'll just add it to my list that keeps growing.

Back on topic I'd replace it since its pretty cheap and its used the whole time the jeep is on
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Unread 12-14-2013, 06:48 PM   #12
Oldfrog
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1997 ZJ 
 
Join Date: Feb 2008
Location: Louisiana/Texas
Posts: 4,030
Someone's getting lumps of coal for Christmas....snicker...
__________________
Cajun Recipes and Fishing tips

Words of wisdom, Posted by Zeejay:
"..it's not air, it is the opposite of air... suckage so to speak."

Stalling? Work through Zeejay's list
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Unread 12-15-2013, 07:06 PM   #13
huntinbuck
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1993 ZJ 
 
Join Date: Dec 2013
Location: Northfield, mn
Posts: 7
Thanks guys for the help I'll check the o2 and go from there
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Unread 12-16-2013, 02:26 PM   #14
MustangFX93
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1996 ZJ 
 
Join Date: Oct 2012
Location: Lakeville, MN
Posts: 45
I know I'm gettin here late, but welcome to the forum! Great to see another ZJ from only a bit south of me!

And yeah, 02 sensor sounds like the culprit of problem #2.
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check engine light , engine 5.2 , stalls

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