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Old 09-20-2010, 01:25 PM   #1
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Rough Idle

Sup guys/girls,

Got a 2.5l 5-spd 95' YJ. Has 72,*** original miles. I've replaced the plugs/wires/distributor & rotor. I've also ran fuel cleaner through the tank (BG44k), cleaned the TB, replaced the air filter. I also ran the engine code scanner by turning the key a set amount of times, but only pulled the "NO AC" code. Are there any other sensors or issues that could be causing this? Currently I'm getting 20.1 mpg according to my fuel logs. Any tips are appreciated. Thanks!

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Old 09-20-2010, 02:49 PM   #2
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not sure myself where to look, but Im wondering if it is sucking air somewhere???

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Old 09-20-2010, 04:12 PM   #3
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Perhaps replace the TBS? Part is about 45$...2 screws. Mine would backfire and run rough .
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Old 09-20-2010, 04:47 PM   #4
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TBS? Never heard of that? I've checked the vacuum lines & they're looking good. Also forgot to add, replaced the lines that run from the valve cleaner to the factory air box. I did some other research & found an "Idle Speed control" motor might be in question. I assumed that if those went, there would be some kind of code related. Thanks for the input guys.
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Old 09-20-2010, 04:51 PM   #5
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Is it getting up to temp, my 2002 2.5l runs like crap if the thermostat is stuck open and it won't get up to temp. Engine light go's on for this though.
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Old 09-20-2010, 05:34 PM   #6
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Temp holds just below 210deg, which ever is the 12oclock position. Oil pressure is high, going up to 75 under throttle. At idle is around 55-60. Thermostat/water pump/hoses are all new.
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Old 09-20-2010, 06:12 PM   #7
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try some injector cleaner
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Old 09-21-2010, 04:17 AM   #8
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Sorry, TPS Throttle Position Sensor not TBS.
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Old 09-21-2010, 08:01 AM   #9
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Ah cool, I'll grab up that and the ISC (?) sensor. Can't hurt to do the Crankshaft position sensor & the one under the distributor as well. I'd rather know there's new parts considering the previous owner had no mechanical history of the Jeep.

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