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Old 05-30-2013, 11:35 AM   #1
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What would cause......

my 99tj to run just perfect until i go offroading every now and then when i hit some hills it seems like it want take the gas and doesnt want to go,but if u lift off the gas and get back in it it goes just fine....WTF....

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Old 05-30-2013, 12:18 PM   #2
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Is it a manual? Are you hi or low 4wheel?

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Old 05-30-2013, 01:25 PM   #3
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my 99tj to run just perfect until i go offroading every now and then when i hit some hills it seems like it want take the gas and doesnt want to go,but if u lift off the gas and get back in it it goes just fine....WTF....
When was the last time you did a tune up? If it only does it on hills, it could be something with the fuel system. Make sure that your fuel filter is clean and that your throttle body is clean as well.

Are you in too high of a gear? When you're off road you want to stay below 3rd gear usually. I run in 4Lo and don't ever have to shift higher than 3rd gear.

I hope this helps!

-Zach
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Old 05-30-2013, 01:31 PM   #4
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Zach, not many are aware the TJ doesn't use the old fashioned inline fuel filters that is easily clogged. The TJ's fuel filter is a heavy-dense white felt-like material that has a positive HUGE surface area. It was designed to be a lifetime filter that for non-third-world Jeepers is entirely reasonable. Not to mention you have to drop the gas tank to even get to it, it is contained inside the fuel pressure regulator & is upstream from the fuel pump. There is a mesh screen filter downstream from the fuel pump.
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Old 05-30-2013, 02:00 PM   #5
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4.0 manual and doesnt matter if your in 2wd 4wd 4wdlo....
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Old 06-03-2013, 09:21 AM   #6
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Zach, not many are aware the TJ doesn't use the old fashioned inline fuel filters that is easily clogged. The TJ's fuel filter is a heavy-dense white felt-like material that has a positive HUGE surface area. It was designed to be a lifetime filter that for non-third-world Jeepers is entirely reasonable. Not to mention you have to drop the gas tank to even get to it, it is contained inside the fuel pressure regulator & is upstream from the fuel pump. There is a mesh screen filter downstream from the fuel pump.
You're right, I must have been thinking of the YJ fuel filter. I comppletely forgot they used the in tank filter in the TJ's. Now that I'm thinking about it, and IIRC that whole unit is non serviceable, and you have to change the pump, sending unit and filter all together.

-Zach
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Old 06-03-2013, 10:12 AM   #7
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Sounds like a possible TPS problem, but that would usually trip a code and your check engine light would come on. TPS = Throttle Position Sensor (IE, the thing that tells the computer how far you are pressing the throttle pedal)..

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