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Old 08-22-2009, 08:00 AM   #1
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No Power

I have a 97 Wrangler with a 4 cylinder engine and a manual transmission. I have had it for about 6 months now and cannot figure out why it seems to lack power, and sometimes spits and sputters, and even backfires once in awhile. It seems to have difficulty when under a load. Takes quite a bit of time to get the vehicle to 65 mph. That's about all the speed I can get.
I have replaced the plugs, wires, cap and rotor. It has an aftermarket K&N air intake, and a riser on the fuel intake. I recently took it to a shop and they checked the fuel pressure and the exhaust. Both checked out fine. I don't have any check engine lights that come on.
I don't know what the problem might be..

Thanks,

Jeff

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Old 08-22-2009, 08:32 AM   #2
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I'll throw a couple things out there. Did you check the gasket on the riser for fuel intake. It may have a leak getting air where its not suposed to. Also how many miles? Did you do a compresson test. Motor can be worn. When they checked the fuel system did they see how the injectors were spraying? They could be bad or clogged. It could be so many things hard to say. You have to eliminate one thing at a time.

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Old 08-22-2009, 09:04 AM   #3
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does the Jeep have a lift? bigger tires will definately rob you of some power. Sounds like it is time for an engine swap. A small block chevy would work nicely.
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Old 08-22-2009, 09:42 AM   #4
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Thank you for your response. The engine does have 115k for miles. According to the Tech, the engine is still very strong. The injectors were not tested. The Jeep does have a 2" Lift and a little larger tires. I will check the gasket. Thanks for your time.

Jeff
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Old 08-22-2009, 11:42 AM   #5
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You could also have a clogged cat. This also causes those symptoms. Disconnect to see if you still have the problem.
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Old 08-22-2009, 09:31 PM   #6
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Thanks for your response.. I assumed when the tech checked the exhaust that would of included the Cat. Is there something different that should be tested? Thanks for your time.

Jeff
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Old 08-23-2009, 01:59 AM   #7
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Little bit of a warning. Just because they said they checked the exhaust does not mean that they actually seperated the pipe and checked the actual insides of both the cat and muffler. Seperate it yourself and give it a look.
They may have just did a visual of the outside and felt the flow. Can feel good at idle but may not have enough flow under load. These engines need to breath.
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Old 08-23-2009, 05:43 PM   #8
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Originally Posted by jkessler View Post
Thanks for your response.. I assumed when the tech checked the exhaust that would of included the Cat. Is there something different that should be tested? Thanks for your time.

Jeff
You can't check it by just looking. A lot of them look great from the outside and then when they are disconnected they are totally clogged. They will also be fine at idle. I bet if you disconnect or replace it your problem will be solved.
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Old 08-24-2009, 08:53 AM   #9
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Thank you for your time..

Jeff
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Old 08-24-2009, 12:07 PM   #10
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well its a 4cyl!!!!!

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