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Old 04-04-2011, 09:35 AM   #1
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Why does my jeep want to hold 1st gear?

If I do not let off the gas in first for my jeep to shift it will hold RPMs to the moon. It will shift as soon as I feather the throttle just a hair. Is this a throttle position sensor problem or did the previous owner have a tuner on it? I would like to reset the PCM, ECM or whatever they call them on jeeps. If this can be done by disconnecting the battery, how long do I have to leave it disconnected? It is an automatic, 4.0, with D35 and D30 axles and I would assume the weenie 303 gears that are soon to be changed. Thanks

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Old 04-04-2011, 12:00 PM   #2
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This is usually a sign of a failing trans. You can reset the ecu by pulling the battery, but I doubt it will do anything.

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Old 04-04-2011, 12:01 PM   #3
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This is usually a sign of a failing trans. You can reset the ecu by pulling the battery, but I doubt it will do anything.
X2 on transmission going out, drive it around and get it warmed up then pull the dipstick on the transmission and smell the fluid, see if it smells a little burnt, or if it is brownish thats not good, how many miles do you have on it? could just need a flush / filter change
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Old 04-04-2011, 12:04 PM   #4
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first things first, check the fluid level.
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Old 04-04-2011, 12:14 PM   #5
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Fluid level, cmon guys. She has 89k miles but i have only had it 4 months. It has done this since 87k miles. If the tranny is going it is holding out a little. Does the battery have to be disconnected for a certain amount of time for the reset? I will see if the fluid smells burnt though just to check.
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Old 04-04-2011, 12:34 PM   #6
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ive been told different times on the battery, i leave mine for 8 hours, although ive been told it is as little as 15minutes, 8 hours works for sure
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Old 04-04-2011, 01:53 PM   #7
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A friends TJ had a similar problem the other day. It had 155k on it and did not want to go into 3rd without feathering the throttle and a little luck. He ended up changing the filter and fluid (was very dirty), and it now shifts fine. It might be a long shot, but definately something to look at.
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Old 04-04-2011, 02:40 PM   #8
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also much easier and cheaper to do the filter lol, never done it on a jeep only chevy trucks, id imagine its the same, pretty cheap and easy, took me about 45minutes last time i did one, on my s10
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Old 04-04-2011, 03:36 PM   #9
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Just drove it around, checked the fluid, level is good and color is red. That is a positive note, I will disconnect the battery tonight and see if any luck with programming on the PCM. Thanks guys.
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Old 04-04-2011, 05:27 PM   #10
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Does the cable from the throttle body to the trans move freely? If it is stuck in the "wide open" position, the trans will not want to shift as it "thinks" you are flooring it.

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Old 04-04-2011, 07:13 PM   #11
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Yeah... I don't know how the tranny works on Jeeps but on my truck, there were two common causes for that problem...aside from tranny going out.

1.) TV cable out of adjustment (the cable that goes from the throttle body to the tranny as mentioned above)...make sure as the throttle body begins to open, the lever on the tranny begins to move at the same time. Too loose and it'll upshift out of 1st too soon I think...and too tight and it won't upshift at all (or that might be switched around).

2.) I had a speed sensor on the tailshaft of my tranny go out that caused it to hang in first gear until I let off the gas and let it shift...however, it also threw a CEL at the same time which confirmed the diagnosis.
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Old 04-05-2011, 07:58 AM   #12
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Yeah... I don't know how the tranny works on Jeeps but on my truck, there were two common causes for that problem...aside from tranny going out.

1.) TV cable out of adjustment (the cable that goes from the throttle body to the tranny as mentioned above)...make sure as the throttle body begins to open, the lever on the tranny begins to move at the same time. Too loose and it'll upshift out of 1st too soon I think...and too tight and it won't upshift at all (or that might be switched around).

2.) I had a speed sensor on the tailshaft of my tranny go out that caused it to hang in first gear until I let off the gas and let it shift...however, it also threw a CEL at the same time which confirmed the diagnosis.
#2 sounds like what I am experiencing here, (letting it shift to 2nd). I will check into this.

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