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Unread 07-04-2011, 11:06 AM   #1
zte87
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1993 YJ Wrangler 
 
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Power loss in reverse!

So when on flat ground my jeep drives in reverse just fine but when backing up a hill my jeep just chokes up and want to die! I don't know if it is related at all but my cel is on with a code 24/25 and I have the new iac and tps ordered! Any ideas on what could cause this?

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Unread 07-04-2011, 06:08 PM   #2
bharris68
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Search for those codes here on J/F and you should get your culprit. One of those two I think is A/C (Which I don't think many of us have), and the other may be your suspect.
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Unread 07-04-2011, 06:13 PM   #3
zte87
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the codes are for the iac and tps sensors this is driveing me nuts!
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93 jeep yj bds 5 inch springs 5/8 boom shackles in the rear, locked front and rear dana 44/60 with front and rear chromoly shafts full cloak armor and 40 inch toyo's
january 2013 yjotm winner!
2013 yjoty winner!
http://www.jeepforum.com/forum/f22/m...build-1272253/

94 jeep zj bb lift, 31-10.50-15 toyo at2s, magnaflow exhaust!
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Unread 07-04-2011, 06:57 PM   #4
Noltz
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well a TPS not functioning right will certainly cause a sputter or low power.

Does it work fine forward up a hill? I'm thinking perhaps the engine torquing is causing something to short out. Had a Toyota that the Crank Sensor wire was shorting against the power steering line, but only in reverse when you backed up fast (or up a hill). It would stall, but immediately restart.
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Unread 07-04-2011, 07:56 PM   #5
zte87
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Yeah it drive up hill forward just fine! I did order new iac and tps sensor's and should have it this week!
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93 jeep yj bds 5 inch springs 5/8 boom shackles in the rear, locked front and rear dana 44/60 with front and rear chromoly shafts full cloak armor and 40 inch toyo's
january 2013 yjotm winner!
2013 yjoty winner!
http://www.jeepforum.com/forum/f22/m...build-1272253/

94 jeep zj bb lift, 31-10.50-15 toyo at2s, magnaflow exhaust!
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Unread 07-04-2011, 08:48 PM   #6
laybackman
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Quote:
Originally Posted by zte87 View Post
So when on flat ground my jeep drives in reverse just fine but when backing up a hill my jeep just chokes up and want to die! I don't know if it is related at all but my cel is on with a code 24/25 and I have the new iac and tps ordered! Any ideas on what could cause this?
I don't think either sensor is bad. The odds of bith of them being NG is too remote. Code 25 does mention a vacuum leak as a possible cause. I would check for a vacuum leak especially at the MAP sensor. That sensor sends a message back to the brain which uses that signal to regulate fuel flow.

Or, you got a wire rubbing up against sumtn!
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Unread 07-04-2011, 09:41 PM   #7
zte87
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it could be a vacuum leak being that I have a nasty exhaust leak somewhere on the manifold! I figured at least one of the sensor is bad tow because when I first start the jeep after its been sitting awhile I have to stay on the gas until its warmed up a little or it will die! I am going to be replacing the manifold (I think it is cracked) with more than likely a cheap pacesetter when I do this I will try and make sure I don't have vacuum leak at that time!
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93 jeep yj bds 5 inch springs 5/8 boom shackles in the rear, locked front and rear dana 44/60 with front and rear chromoly shafts full cloak armor and 40 inch toyo's
january 2013 yjotm winner!
2013 yjoty winner!
http://www.jeepforum.com/forum/f22/m...build-1272253/

94 jeep zj bb lift, 31-10.50-15 toyo at2s, magnaflow exhaust!
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Unread 07-04-2011, 09:53 PM   #8
dodger889
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exhuast leaks only mess up the O2 sensor not the others. I would check over the vacuum lines make sure none of them are getting bad.
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Unread 04-17-2013, 09:25 AM   #9
mauricioarce
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Did you get a solution

Hello there

Did you get a solution for this issue

I have the exact same problem my Jeep is a 199 TJ with 2.5 engine

Please let me know
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