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Unread 05-16-2010, 10:22 AM   #1
92BlackandBlue
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1992 YJ Wrangler 
 
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Location: Monument, CO
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92 trouble codes

Hello everybody,

I did a brief search but couldn't find anything about it, but is there a way to get the trouble codes from a 92 4.0 and if so, what are the codes? I've got a problem where my jeep is idling about 1200 rpm but about every 2-5 seconds it drops so low I think it's going to quit. I can also feel the surging going down the highway at any speed and just driving around town, I feel like I'm in a prius with a stuck throttle. Any help would be greatly appreciated.

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Unread 05-16-2010, 11:01 AM   #2
JohnFM3
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1992 YJ Wrangler 
 
Join Date: Apr 2007
Location: Bonney Lake, Wa
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I didnt think there were trouble codes. The old Chrysler way of pulling codes was turn on this rig to ON, the toggle Off and On 3 times I think and watch the check engine light.

Since 92 is a Chrysler, I would suggest that. I am maybe wrong, and going to go check my 92 myself to find out for sure.

I am sure someone else will chime in soon.

John
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John Moore ~ Real Men Still Crawl...
97 XJ (Diablo) 4.0L H.O. w/AW4 4sp Auto Dana 30/Chry 8.75 2.5 inch Flowmaster Exhaust 4 inch Lift w/ 32inch tires & RS5000 Shocks
92 YJ (BOSS) 4.0L H.O. w/AX-15 5sp Manual, 231 TCase, Dana 30/8.8 (3.73) 2.5 inch Flowmaster R.E. 2 inch lift and 2 inch body lift for CJ clip
XJ http://www.cardomain.com/ride/2634588 YJ http://www.cardomain.com/ride/3322306
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Unread 05-16-2010, 11:48 AM   #3
SpideYJeep
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1992 YJ Wrangler 
 
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Location: El Lay, TRIP!
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I asked, too, and got answers in this thread :
http://www.jeepforum.com/forum/f12/o...nners-1031602/
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Wrenching isn't the problem, it's the brains attached to the hands...unfortunately, I'm lacking some of the former so that's why I'm asking you guys!!

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My YJ is so excited it's leaking oil!
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Unread 05-16-2010, 01:05 PM   #4
JohnFM3
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Quote:
Originally Posted by SpideYJeep View Post
I asked, too, and got answers in this thread :
http://www.jeepforum.com/forum/f12/o...nners-1031602/
Thanks. I learn something new.
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John Moore ~ Real Men Still Crawl...
97 XJ (Diablo) 4.0L H.O. w/AW4 4sp Auto Dana 30/Chry 8.75 2.5 inch Flowmaster Exhaust 4 inch Lift w/ 32inch tires & RS5000 Shocks
92 YJ (BOSS) 4.0L H.O. w/AX-15 5sp Manual, 231 TCase, Dana 30/8.8 (3.73) 2.5 inch Flowmaster R.E. 2 inch lift and 2 inch body lift for CJ clip
XJ http://www.cardomain.com/ride/2634588 YJ http://www.cardomain.com/ride/3322306
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Unread 05-16-2010, 01:41 PM   #5
sequel
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If it's a '92 you should be able to do the on-off-on 3x and it will flash them to you through the check engine light. Works on my '92.
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1992 Black YJ, 4L I6, 8.8 Rear
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DT-3000s, 16x8 Bajas,
285/75R16 Dunlop Mud Rovers
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Unread 05-16-2010, 01:41 PM   #6
johnoutdoors
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JohnFM3 has it right. Count the number of times your CEL flashes. Longer pause is a break to start back at one. Example * ** ***** ***** would be 1 2 5 5 codes 12 and 55. Check the FAQ sect or a repair manual for the meaning of the codes.
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Unread 05-16-2010, 01:50 PM   #7
idaholtby
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1991 YJ Wrangler 
 
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From the FAQ ..... http://www.jeepforum.com/forum/f12/f...y-here-451154/ Post #6 and #7. No scanner required.
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Unread 05-16-2010, 02:13 PM   #8
92BlackandBlue
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Ok, I found my problem, I wasn't waiting for the light to start flashing long enough. I guess today's age of computers you expect instant results.
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Unread 05-17-2010, 12:08 AM   #9
92BlackandBlue
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It looks like over 3 codes were displayed. So now, my question is if I disconnect the battery to reset to codes without any repair work done, and then restart the engine, will the still active display codes be displayed?
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Unread 05-17-2010, 12:12 AM   #10
JohnFM3
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If you clear the codes, they will come back when the ECU records them again. It could take 5 mins, it could take 5 miles. You just dont know how long it will take.

In order to clear them, I used too disconnect batter, and press brake pedal for an extended period of time of 30 mins (which is probably overkill).

John
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John Moore ~ Real Men Still Crawl...
97 XJ (Diablo) 4.0L H.O. w/AW4 4sp Auto Dana 30/Chry 8.75 2.5 inch Flowmaster Exhaust 4 inch Lift w/ 32inch tires & RS5000 Shocks
92 YJ (BOSS) 4.0L H.O. w/AX-15 5sp Manual, 231 TCase, Dana 30/8.8 (3.73) 2.5 inch Flowmaster R.E. 2 inch lift and 2 inch body lift for CJ clip
XJ http://www.cardomain.com/ride/2634588 YJ http://www.cardomain.com/ride/3322306
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Unread 07-12-2010, 03:27 PM   #11
92BlackandBlue
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1992 YJ Wrangler 
 
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Ok, I found a broken vacuum line, and fixed it. Disconnected the battery for about 5-10 minutes and turned the engine on. It ran good for about 3 min, then the idle speed started dropping again and then it displayed the same problem as before, Idle almost dropping to the point the engine stops. So, I ran the engine codes again, and I came up with this.

12 - Battery Disconnect, which I assume is because I've disconnected the battery to reset the computer

33 - A/C circuit, I don't have AC

So is there anybody that can help me here? I've got to try to fix this myself if possible because the truck (F350) is in the shop and I simply can't work on that myself. The Jeep is my toy to work on, but now I'm out of reliable vehicles and I need one to run!
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Unread 07-12-2010, 03:35 PM   #12
JohnFM3
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Quote:
Originally Posted by 92BlackandBlue View Post
Ok, I found a broken vacuum line, and fixed it. Disconnected the battery for about 5-10 minutes and turned the engine on. It ran good for about 3 min, then the idle speed started dropping again and then it displayed the same problem as before, Idle almost dropping to the point the engine stops. So, I ran the engine codes again, and I came up with this.

12 - Battery Disconnect, which I assume is because I've disconnected the battery to reset the computer

33 - A/C circuit, I don't have AC

So is there anybody that can help me here? I've got to try to fix this myself if possible because the truck (F350) is in the shop and I simply can't work on that myself. The Jeep is my toy to work on, but now I'm out of reliable vehicles and I need one to run!
After you removed the battery, did you check for codes? Are you positive that the codes were cleared by just disconnecting the bat?

John
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John Moore ~ Real Men Still Crawl...
97 XJ (Diablo) 4.0L H.O. w/AW4 4sp Auto Dana 30/Chry 8.75 2.5 inch Flowmaster Exhaust 4 inch Lift w/ 32inch tires & RS5000 Shocks
92 YJ (BOSS) 4.0L H.O. w/AX-15 5sp Manual, 231 TCase, Dana 30/8.8 (3.73) 2.5 inch Flowmaster R.E. 2 inch lift and 2 inch body lift for CJ clip
XJ http://www.cardomain.com/ride/2634588 YJ http://www.cardomain.com/ride/3322306
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Unread 07-12-2010, 04:06 PM   #13
92BlackandBlue
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1992 YJ Wrangler 
 
Join Date: Mar 2003
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Well, I had the battery disconnected for awhile, 2-3 beers worth. And even if the codes weren't cleared, how do the current codes really tell me what is happening?
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Unread 07-12-2010, 04:23 PM   #14
sequel
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The computer probably won't tell you much in the case as all the sensors are reporting within tolerance. A couple of things that I think it may be:

1) Clean your throttle body. If it's dirty, especially the Idle Air Motor channels, it will cause a dirty idle.

2) o2 sensor. If it's on it's way out, it could be reporting a signal within tolerance, but not optimal.

3) Throttle position sensor. I had some problems with idle and i think that it got better with the TPS being replace...but i did throw some errors with it.
__________________
1992 Black YJ, 4L I6, 8.8 Rear
3.5" BDS, 5/8" MORE Shackles,
DT-3000s, 16x8 Bajas,
285/75R16 Dunlop Mud Rovers
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Unread 07-12-2010, 04:32 PM   #15
Roadyy
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Alot of times it will not show the codes while just idling once you have cleared them. You need to drive it around the block to get it warmed up and then come back and check the codes again. You could still have a vacuum leak( old cracking vacuum lines) or the AIC could need a good cleaning.
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