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Unread 02-28-2011, 01:44 PM   #1
corbin9191
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1998 jeep cherokee keeps spitting and sputtering

Hi everyone, I posted this a while back and got some replies and I tried all of them but they didn't help. As the title says my 1998 jeep cherokee 4.0 with auto tranny keeps spitting and sputtering when I am going down the road after the first startup and if I shut it off and start it back up it will do the same thing. Even when it is as idle for a few minutes it will start to spit and sputter like it is not getting enough gas. I have changed the O2 sensors not even 4 months ago, I put a new magnaflow CAT on it, I have a different TPS on it and the only codes I keep getting are about the O2 sensor and heater is bad. I have gone through about 3 sets of these and nothing seems to help. What do you think? Thank you

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Unread 02-28-2011, 02:22 PM   #2
Tyreman
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i have a similar problem. mine seems to act up if i drive above 65 mph.
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Unread 02-28-2011, 02:41 PM   #3
corbin9191
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Mine will do it within 500 yards of where I start the vehicle up at. But after it does it just once it will stop.
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Unread 02-28-2011, 02:41 PM   #4
CJ7-Tim
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Quote:
Originally Posted by corbin9191 View Post
....my 1998 jeep Cherokee 4.0 with auto tranny keeps spitting and sputtering when I am going down the road after the first startup and if I shut it off and start it back up it will do the same thing.
Sputtering, bucking, stalling and backfires are all symptoms of an O2 sensor problem.



Quote:
Originally Posted by corbin9191 View Post
... the only codes I keep getting are about the O2 sensor and heater is bad. I have gone through about 3 sets of these and nothing seems to help. What do you think? Thank you
Post the exact 4 digit Trouble Codes you are down loading.

Have you checked the O2 sensor heater fuses ?

Just because the code says O2 sensor, doesn't mean the sensor is bad. If the computer can't access the O2 sensor due to a failed fuse, damaged wires or wire connector, or for other reasons, the computer can't be more specific in the fault codes.
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Unread 02-28-2011, 04:43 PM   #5
corbin9191
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Were could I find the fuse for the O2 heater? just in the normal fuse box? I know all the wires look good because I checked them very thoroughly last night.
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Unread 02-28-2011, 04:51 PM   #6
hubs97xj
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O2 sensor fuse should be in the PDC (the underhood fuse/relay block).
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Unread 02-28-2011, 04:56 PM   #7
tjwalker
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Yes, we need the exact code numbers. With OBD, the devil is in the details.

The fuse for the heater circuit on the oxygen sensors is located in the PDC (power distribution center), the black box under the hood on the passenger side.

It is a MINI-FUSE, 15 amp. I cannot tell you the exact location, but I think it is around the slot 15-17 area. However, you should verify (with a meter) every 15 amp mini-fuse in the PDC so you don't miss anything.

It is critical that you verify this fuse circuit before moving onto anything else. As you have already replaced the sensors, the fuse is a VERY likely suspect here.

Good luck and update us as to how it goes.
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Unread 02-28-2011, 05:01 PM   #8
Zabner28
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Is it throwing a check engine light? check your fuse for the o2 sensor also. I had the same problem. It turned out I had a cracked manifold... Id give that a good look also. Might also be the crank sensor. But deffinatly sounds like an o2 problem, or maybe a map sensor...
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Unread 02-28-2011, 05:06 PM   #9
corbin9191
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Ok I will take the codes as soon as I get home. Yes it is throwing a check engine light. I checked manifold last night real well because I had the head off (had to replace the head gasket) and I didn't see any marks from an exhaust leak. How would I check to see if it is a MAP sensor or the Crank sensor?
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Unread 02-28-2011, 05:11 PM   #10
Zabner28
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Im not sure if you can check the map or crank.. something I have not learned yet(; but, I know a map will cause your vehicle to run terrible, and When my crank sensor was going out, It would die and sputter sometimes. I would check your fuse to start with. BUT! a crank sensor will not throw a light, or a code.. I dont believe the map will either, so I would say you can eliminate that. Uhm I have herd of jeeps ECU's going out, You have two o2 sensors, did you replace both? I am leaning toward it being the 15 amp fuse blown...
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Unread 02-28-2011, 05:19 PM   #11
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Follow your codes! This can't be emphasized enough.

If you have a code for an 02 sensor problem, you MUST verify that circuit. The OBD system on the Jeep is awfully darn good at pointing you in the right direction.
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Unread 02-28-2011, 05:32 PM   #12
corbin9191
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Quote:
Originally Posted by tjwalker View Post
Follow your codes! This can't be emphasized enough.

If you have a code for an 02 sensor problem, you MUST verify that circuit. The OBD system on the Jeep is awfully darn good at pointing you in the right direction.
The first thing I am going to do is get the codes and post them up and focus on just the problem the codes are telling me. I am just always wanting to learn ways of testing other things just in case
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Unread 02-28-2011, 07:11 PM   #13
corbin9191
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Ok guy's, I checked the codes and here they are. 1st code is P0132 and the 2nd code is P0135 They are both referring to the front O2 sensor
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Unread 02-28-2011, 08:49 PM   #14
Zabner28
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And you replaced both the front and rear o2? Check the fuse under the hood I believe, its a 15 amp. maybe you got a faulty o2
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Unread 02-28-2011, 10:03 PM   #15
corbin9191
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Yes I have replaced both O2 sensors 3 times so far in the past 2 years. I checked all the fuses and they all looked fine.
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