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Old 03-31-2016, 10:31 PM
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Low Power

2004 4l manual 5 speed.

When accelerating in all gears, but most noticeable in 4th and 5th, there is very little power. I have to hold the accelerator to the floor in a very gradual incline.

No CEL and this is new onset.

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Old 03-31-2016, 10:33 PM
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I guess I should ask a question...

Any ideas?

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Old 03-31-2016, 10:56 PM   #3
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Plugged catalytic converter?
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Old 04-01-2016, 11:40 AM
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Maybe but the cc is only about 2 years old.
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Old 04-01-2016, 12:00 PM   #5
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Check your fuel pressure. My Jeep was the same way, so I checked the pressure and only had 30 PSI. It should be 49.2 +/- 5 PSI, depending upon the model. Come to find out it was a weak fuel pump. I got a pretty good deal for a new Bosch pump/sending unit assembly at rockauto.com.
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Old 04-01-2016, 03:23 PM
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Could a clogged fuel filter do this?
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Old 04-01-2016, 03:26 PM   #7
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The fuel filters in TJs are considered lifetime filters. I would look into the suggestions mentioned above
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Old 04-01-2016, 04:18 PM   #8
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Check your brake calipers to see if anything got stuck in there and is causing your pads to stay in contact with your rotora. Happened to mine and actually set my brakes on fire
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Old 04-01-2016, 04:20 PM
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OK so for a guy like me who is mildly mechanical, how do I check the fuel pressure? Btw, thanks for your responses.
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Old 04-01-2016, 05:10 PM   #10
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Most of your chain auto part houses have a loaner tool program with a variety of tools and gauges. You can get a fuel pressure gauge this way. Just leave a deposit and as long as it's returned undamaged you'll get your money back. If you look on the fuel rail that connects your injectors above the intake, there is a schrader (tire type) valve between the second and third injectors. unscrew the cap and connect the pressure gauge. Crank her up and see what your pressure is.
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Old 04-01-2016, 05:21 PM
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Excellent! I'll work on that Sunday. Thank you all so much.
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Old 04-02-2016, 11:14 AM   #12
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Quote:
Originally Posted by Crazycooter75 View Post
Most of your chain auto part houses have a loaner tool program with a variety of tools and gauges. You can get a fuel pressure gauge this way. Just leave a deposit and as long as it's returned undamaged you'll get your money back. If you look on the fuel rail that connects your injectors above the intake, there is a schrader (tire type) valve between the second and third injectors. unscrew the cap and connect the pressure gauge. Crank her up and see what your pressure is.
I think I am going to check this too.. Mine just doesn't feel as powerful as I think I think it should. should the pressure always be (49.2)? at idle and when revd up?
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Old 04-02-2016, 11:40 AM   #13
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Quote:
Originally Posted by Arlan View Post
2004 4l manual 5 speed.

When accelerating in all gears, but most noticeable in 4th and 5th, there is very little power. I have to hold the accelerator to the floor in a very gradual incline.

No CEL and this is new onset.
What size tires are you running? Did you recently install larger tires? If so, have your axles been regeared?
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Old 04-02-2016, 12:45 PM   #14
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I think I am going to check this too.. Mine just doesn't feel as powerful as I think I think it should. should the pressure always be (49.2)? at idle and when revd up?
From what I have read, yes. I checked on mine and the needle didn't move when I revved it.
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Old 04-02-2016, 01:02 PM   #15
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Better question is the jeep new to you and or is this lack of power something different/recent/change?
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Old 04-03-2016, 11:29 AM
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The tires are 31s and have been on there about a year with no problems and no regearing. We have had the Jeep for about 3 years. It has been dragging for about 3 days.
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Old 04-03-2016, 11:34 AM   #17
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Have the main catalytic converter checked by a muffler shop to see if it is clogged which will cause too much back pressure. A clogged cat can cause your exact problem.
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Old 04-03-2016, 11:39 AM
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Will do.
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Old 04-04-2016, 06:43 PM   #19
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I think I am going to check this too.. Mine just doesn't feel as powerful as I think I think it should. should the pressure always be (49.2)? at idle and when revd up?
well I just checked mine with store rented gauge and its at 46.. it starts good idles great, doesn't miss a beat, just doesn't feel real powerful to me.. 456/33/12.50's should be a good combo right? NV3550
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Old 04-04-2016, 08:27 PM   #20
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Yep 4.56 is ideal for 33's and the NV3550.
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Old 04-04-2016, 08:53 PM   #21
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tried toad this but too late.. should I change pump? or think gauge is slightly off? lol
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Old 04-06-2016, 06:11 PM
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OK folks here is the update. The muffler was clogged and creating a large amount of back pressure to the engine. Muffler and pipes replaced and running like a champ.
Thanks to everyone for their suggestions.
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Old 04-06-2016, 08:17 PM   #23
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OK folks here is the update. The muffler was clogged and creating a large amount of back pressure to the engine. Muffler and pipes replaced and running like a champ.
Thanks to everyone for their suggestions.
Muffler? Could you have meant the catalytic converter? No matter, that's great news.
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Old 04-06-2016, 08:29 PM
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Well...I could be mistaken.
With all due respect, I'm pretty sure it was the muffler. Protected by the skid plate?
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Old 04-06-2016, 08:45 PM   #25
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The catalytic converter is above the skid plate, the muffler is at the rear.
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Old 04-07-2016, 01:46 PM   #26
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Them cats can get clogged so easy. My old tj had one that was clogged and on the way home one night it fully just closed up. Couldn't get over 15 mph. Glad you figured it out.

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