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Old May 1st, 2013, 07:51 PM   #1
jpr Jeremy
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Question 2.5l bogs under load

So I take my jeep out to my sons baseball practice tonight, first time I've driven it since the Rocks & Valleys Easter run. It's ran great until tonight. It starts, idles, & takes off just fine, but when I let out the clutch to shift up a gear it bogs & misfires until I let up on the throttle a bit, while it bogs I could smell unburnt fuel. The check engine didn't come on either. What should I look for in this situation? My jeep is a '95 YJ 2.5l 5 speed, 35's with 4.88 gears.
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Old May 1st, 2013, 07:57 PM   #2
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Check for plugged exhaust or bad tps sensor

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Old May 1st, 2013, 08:09 PM   #3
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Check for plugged exhaust or bad tps sensor

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The plugged exhaust is a possibility, I just remembered there was something rattling in my muffler during my post beat down inspection. I'll be changing the muffler out before I dig into it any further. Thanks, I figured I would pick the great minds of GL4x4 while getting my kids in bed.
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Old May 1st, 2013, 08:14 PM   #4
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its prolly not the muffler more than likely its the converter guts all broke up and plugging the inlet to your muffler
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Old May 1st, 2013, 08:24 PM   #5
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I know it's not the cat, that's been gone for a few years. Is there a way to test the tps?
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Old May 1st, 2013, 08:30 PM   #6
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The easiest way to test a tps is with a scanner and watch the % numbers as u sloely push down the gas pedal but if ur muffler is rattling i would start there first

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Old May 1st, 2013, 08:35 PM   #7
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The easiest way to test a tps is with a scanner and watch the % numbers as u sloely push down the gas pedal but if ur muffler is rattling i would start there first

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Thanks for the input. Now that the kids are in bed I had time to search a little more. It definitely sounds like the tps took a shit but I'll check it from my uncle's scanner before I start throwing money at it.
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Old May 1st, 2013, 08:40 PM   #8
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You can use a multimeter. There are 3 wires. 5v, ground, and tps voltage. Less than a volt at idle, and 4.7ish at wot. The tps voltage should smoothly increase to maximum voltage while the throttle is being applied. Look for spikes and dead spots.
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Old May 1st, 2013, 08:46 PM   #9
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You can use a multimeter. There are 3 wires. 5v, ground, and tps voltage. Less than a volt at idle, and 4.7ish at wot. The tps voltage should smoothly increase to maximum voltage while the throttle is being applied. Look for spikes and dead spots.
Thanks, that sounds easy enough to do.
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Old May 15th, 2013, 10:21 PM   #10
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So, after spending about 12hrs total here and there tracing wires, cleaning grounds, testing sensors & circuits, & finally checking all the fuel components. I had it narrowed down to the fuel pump, it would run but wouldn't build a whole lot of pressure. That's when I decided it was time to drop the fuel tank. As I started to drop the tank I noticed one minor detail that I over looked....the damn tank was EMPTY!!! I never even thought to check that since the gauge still read just over 1/4 tank. So the moral of the story is...start with the basics.
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Old May 15th, 2013, 11:06 PM   #11
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But now u know all ur sensors r good lol

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