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Old 07-24-2013, 02:47 AM   #1
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Jeep surging/losing power & rattles.

I have a very...intense problems with my 2006 Wrangler. It's a six speed manual, 2.4L.

First, one some days, it will begin surging (almost a start/stop action), as in too much power then not enough every 10 mph unless I immediately shift up. This causes issues going uphill, because the Jeep will want to be in a higher gear than can give it power, so it loses speed until I have to downshift, which immediately leads to the surging.

The second part of this problem is that at 60 mph, it immediately loses power until the speedometer falls to about 54, then it begins to respond again.

As you can imagine, this causes some issues on the highway. I've tried to google the problem (and always get a lot of Toyota pages) but I'm having a hard time narrowing it down. Has anyone experienced something like this?

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Old 07-24-2013, 11:00 AM   #2
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Has it thrown any codes (CEL light on)? If so, you can have one of your local PepBoys, Advance, etc stores decode it and tell you what sensor is going.
From what I've seen it could be the TPS, an O2 sensor (usually one of the pre-cat sensors) or possibly fuel pressure/fuel pump.

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Old 07-24-2013, 12:18 PM   #3
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I'm taking it in tomorrow. I hope it's something that relatively simple.
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Old 07-24-2013, 12:27 PM   #4
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I just had this same thing on my 06, it threw codes for the crankshaft position sensor and the camshaft position sensor (PO335 and PO339). I read on-line that it could also me the throttle position sensor, so I changed the crankshaft and throttle sensors and still had the issue. I then took it in, and it turns out the wiring harness for the sensors had rubbed it's self worn and was shorting out. The cost of the two sensors was like 50 bucks and took only a few minutes each to change. That might fix your issue, otherwise check out the wiring from both. Hope this helps.
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Old 07-24-2013, 01:15 PM   #5
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Hey, thanks for those. I like having all this information before stepping into the dealership. I'll let you all know how it turns out tomorrow.
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Old 07-24-2013, 01:48 PM   #6
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What was the location of the rubbing harness? I've had the same issue for years in varying degrees from an occasional skip to a full on loss of power. I've replaced plugs, TPS sensor, and it still happens just not as often. The CEL was on before i changed that stuff but now its not. I have the same year, engine, and trans. 06SE 2.4 w/6 speed. Thanks
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Old 07-24-2013, 02:20 PM   #7
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Quote:
Originally Posted by Tiburon View Post
What was the location of the rubbing harness? I've had the same issue for years in varying degrees from an occasional skip to a full on loss of power. I've replaced plugs, TPS sensor, and it still happens just not as often. The CEL was on before i changed that stuff but now its not. I have the same year, engine, and trans. 06SE 2.4 w/6 speed. Thanks
Not sure where it was rubbing, the autoshop fixed it. But i'll take a look tonight and see if I can figure it out. Runs like a champ now, well runs like a jeep!
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Old 07-26-2013, 12:08 AM   #8
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Unfortunately, changing both the camshaft and crankshaft sensors (and checking the wire harness) has not fixed the problem. An O2 sensor code also popped up, so I'm taking it in Tuesday for that.

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