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Old 12-16-2013, 09:43 AM   #1
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No acceleration

Greetings folks. Here is a new for me. This morning I was headed to work and noticed that my 2007 JK would not accelerate above 40 mph. I turned around and took her home and hopped in the Porsche to get to work.

It was about 30 degress this morning which I dont think should be an issue. The Jeep is an 07, 4dr with automatic transmission. It is also 2WD. The only previous issue was a new computer back in 09 and no major troubles since. Their are no CEL's at this point.

Getting up to 40mph was not a problem but it would not accelerate past that. No sounds or strangeness felt.

Any clues?

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Old 12-16-2013, 11:13 AM   #2
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Do the engine rpms increase as you hit the gas and your Jeep doesn't accelerate?

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Old 12-16-2013, 11:37 AM   #3
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The rpm's do increase. There is no indication of trouble from 0-40. I did notice one thing this morning though. The battery gave just a hint of slow starting. I thought it might be the cold weather. Could a low battery put the computer into some kind of safe or limp mode?
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Old 12-16-2013, 11:49 AM   #4
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Quote:
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The rpm's do increase. There is no indication of trouble from 0-40. I did notice one thing this morning though. The battery gave just a hint of slow starting. I thought it might be the cold weather. Could a low battery put the computer into some kind of safe or limp mode?

Possibly, try charging the battery. I would also check the transmission fluid level to rule that out. What is puzzling to me is your engine rpms are increasing which means the engine is making power and that power should increase speed. Charge up the battery and check the tranny fluid level and report back. Check for codes, even though the CEL isn't on, and report on that too.
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Old 12-16-2013, 01:22 PM   #5
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Agreed, immediately check transmission fluid and look for codes.
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Old 12-16-2013, 01:48 PM   #6
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How many miles are on it? If your engine has not been running efficiently, then you could have a clogged catalytic converter.
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Old 12-16-2013, 02:29 PM   #7
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Agree on the converter, Jeeps are known to be hard on them, I had the same conditions happen, what occurs is the internals start coming apart and blocks the exhaust....way to check is listen to converter with the engine running, if you hear rattling...that would be it.
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Old 12-16-2013, 02:34 PM   #8
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I had a similar problem with my '93 dodge shadow about 10 - 12 years ago. It ended up being bad gas. I stopped going to the base gas station and went to the Shoppete gas staion and that problem went away.

Quote:
Originally Posted by Gator996 View Post
Greetings folks. Here is a new for me. This morning I was headed to work and noticed that my 2007 JK would not accelerate above 40 mph. I turned around and took her home and hopped in the Porsche to get to work.

It was about 30 degress this morning which I dont think should be an issue. The Jeep is an 07, 4dr with automatic transmission. It is also 2WD. The only previous issue was a new computer back in 09 and no major troubles since. Their are no CEL's at this point.

Getting up to 40mph was not a problem but it would not accelerate past that. No sounds or strangeness felt.

Any clues?
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Old 12-16-2013, 03:53 PM   #9
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Great advice by all. I will dig into tonight.
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Old 12-16-2013, 04:38 PM   #10
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torque converter could be slipping
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Old 12-16-2013, 06:38 PM   #11
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Ok, this Jeep is schizophrenic. Got home a few minutes ago and ran through the suggested diagnostics. Transmission fluid good. No noisy cats. It started just fine with no battery issues. I took it out for a drive and it's working as it should. Shifting is smooth and timely and no troubles getting up to speed.

I did pull two codes though:

P0073. I have had this code before with an occasional CEL. This is a fault with the ambient air temp sensor? Sometimes the dash outside temp gauge reads crazy or zeros out.

P0562. Low battery voltage I think? This code is new. Could the battery be on the way out? I can't get it to a tester before they close tonight.

So, the bottom line is that I have no idea what is going on with this thing.
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Old 12-16-2013, 07:02 PM   #12
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I would eliminate the battery as a problem. If it's over 3 yrs. old I would replace it.
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Old 12-16-2013, 07:25 PM   #13
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P0073 shouldn't have any impact on how the Jeep drives, the battery OTOH might, and I would replace it. Or see it they can possibly pro-rate it for you under a warranty if it still has one.
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Old 12-16-2013, 07:43 PM   #14
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The battery is a tad over two years old. Replacing it is the first thing I will do tomorrow.
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Old 12-16-2013, 10:16 PM   #15
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With some of the codes, your jeep might have went into limp mode.
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Old 12-17-2013, 01:26 PM   #16
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Quote:
It was about 30 degress this morning which I dont think should be an issue
Temperature is not an issue. Haven't got any problem with mine this morning.


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