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Old 09-25-2012, 07:23 PM   #1
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Exclamation Engine stumble during initial take off

I have a 98 wrangler 2.5l. During take off my engine will stumble before shifting out of first. It corrects itself in a matter of seconds and engine runs normal from then on. It happens at random whether the engine is hot or cold, though only happens during the initial takeoff after starting the engine. It occurs i would say roughly 1 out of every 10 initial takeoffs after engine start. It was throwing a throttle position sensor code i was very confident that replacing the tps would be the fix. I replaced the tps a few hours ago and while doing so i removed throttle body and cleaned it up and filled connectors with dielectric silicone before reinstalling. After putting it back together and taking it for its first test run it stumbled like it had been doing before. It hasn't occurred since but i am pretty certain it will happen again and the throttle position sensor didnt correct the issue. Has anyone had this problem? Please help!!

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Old 09-25-2012, 07:27 PM   #2
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My 97 does the same thing. I've been chasing that grimly. For over a year now. Mine seems to do it less when running 100% gas no ethanol but not a complete cure.

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Old 09-25-2012, 07:52 PM   #3
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Well if you figure it out let me know. I bought the jeep about 5 months ago its been doing it since i got it i havent been able to cure it and its going to drive me crazy if i dont figure out what it is. Im a very successful shade tree mechanic myself growing up in my grandfathers engine machine shop and shadowing countless mechanics my dad has managed in general motors dealership service departments. We both refuse to pay someone to look at it but we are very open to suggestions because between the two of us we have about 40 years experience it has us both stumped.
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Old 09-25-2012, 07:59 PM   #4
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Seafoam...
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Its a Jeep thing...
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Old 09-25-2012, 08:40 PM   #5
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I have tried lucus intake and injector cleaner didnt help.
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Old 09-25-2012, 08:41 PM   #6
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I have run seafood in the gas (and also thoroughly cleaned the throttle body and IAC). Again it helped bi t didn't fix the problem. I'm continuing to chip away at it but not there yet. Mine seems to be an overloading of choak while under load, I can press the clutch and rev the engine and when I return to gear all is fine. While if you just push the gas to it while acting up it continues acting up. I think it might be a glitch in the ECM.
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Old 09-25-2012, 08:51 PM   #7
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Mine does the same we clearly have the same problem. I have a 97 gmc sonoma with a 4.3 v6 that im thinking about gutting and dumping the engine trans and all in the ole tj. The 4 cylinder just doesnt have the power i need especially when i go to put big tires and lift. The 4.3 will eliminate whatever problem im experiencing for sure.
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Old 09-26-2012, 05:23 AM   #8
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I'm sure an engine swap will get rid of the problem. How big are you planning to go on lift and tires?
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Old 09-26-2012, 06:43 AM   #9
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i think im going to go with a 3'' lift and 33'' tires.
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Old 09-26-2012, 07:59 AM   #10
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Check the plugs.
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Old 09-26-2012, 08:42 AM   #11
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33s might be a bit much but I'm doing fine with 31s and the 4 banger.
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Old 09-26-2012, 09:56 AM   #12
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I replaced the plugs and wires about 1000 miles ago. Saw improvement in mpg and throttle response but didn't cure the occasional stumble during take off
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Old 09-26-2012, 10:10 AM   #13
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Yeah I won't be putting 33's until the v6 conversion. Do you have any lift? I would like to find a decent lift for a low price I have considered just getting a coil spacer lift with new shocks but I know ill be better off in the long run to go ahead and buy longer coil springs
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Old 09-26-2012, 10:50 AM   #14
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I'm running a 2" budget boost. You can also swap the springs from a v8 WJ or a Crown Vic and get 2-3"
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Old 09-26-2012, 10:54 AM   #15
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TPS was my first thought when reading the OP. Whenever I replace a sensor I disconnect the negative battery cable to force the computer to reset itself but if you didn't do that it likely ran with the last known configuration before it figured out the new TPS was in control.

If it happens again check to see if it threw a new OBDS code and follow it.
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Old 09-26-2012, 11:12 AM   #16
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I disconnected battery while I was installing sensor. I was thinking what you said about the computer running the last configuration before recognizing new tps bc it hasn't acted up since the first test drive but it occurs only a small percent of the time so we will see
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Old 09-26-2012, 04:16 PM   #17
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Quote:
Originally Posted by Iceman
33s might be a bit much but I'm doing fine with 31s and the 4 banger.
I have 32x11.5 on my 97. it does ok thinkin of regearing down to 4.56 though. mine did this once and hasn't since it was a while ago too. don't know why though.

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engine misfire , engine stumble , initial takeoff , throttle position sensor

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