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  #1  
Old 01-28-2016, 11:36 AM
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Bogging down around 4-5k

Hello everyone, I'm new here looking for help, lol.

I have a 2002 WJ 4.7 non H.O, that"s losing power in the upper RPMs or bogging down. If I'm doing 65 MPH and floor it it will shift down to 2nd start to accelerate until the RPMs get to around 4000-4500k, then it will just sit there bogging down it wont even shift into 3rd, not until after I let off the gas. This is been going on for about a month now, no dtc, new plugs, Ive changed the drivers o2 sensor about 2 months ago. I thought it might of been the cat plugging up so I removed both and they were fine. Fuel pressure is good at least at idle, dont know at wot. Sometimes after a trip I'll start it back up and it will run rough, feels like its missing, and it will like burnt oil, sometimes it would die, other time i'll give it gas and it would try to rev up, then it would run fine minus the power loss. Any insight will be appreciated!!!! Yesterday I installed new fuel pump and strainers, fix the exhaust manifold leak, and a new TPS sensor. It still doing it no codes, its not leaning out as far as the o2's are saying. It has the muffler on and the last cat that's right before the muffler. Could the PCV system cause this? The elbows that go to the valve cover were bad so I replaced them with hose and now there kinked. I'll post the video I took. Video Flooring every time, sometime fast and sometimes slowly.

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  #2  
Old 01-28-2016, 11:23 PM
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Re: Bogging down around 4-5k

How are the plugs and air filter?
You did change the pump, but did you change the filter/regulator?
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Old 01-29-2016, 08:21 AM
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Re: Bogging down around 4-5k

Did you use Mopar TPS? The 4.7s don't like the aftermarket TPS.

How many miles on it?
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Old 01-29-2016, 09:42 AM
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Re: Bogging down around 4-5k

yes I changed the filter/ regulator. It is a mopar TPS, 187000 miles
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Old 01-29-2016, 02:21 PM
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Re: Bogging down around 4-5k

If you floor the accelerator, then the O2 sensors will not be used for fuel trimming, it will just inject fuel according a pre-programmed schedule. So i would discard the O2 sensors for now.
Regarding your question if the crankcase ventilation could cause said problems, probably yes. The kinked hoses will cause an increase in the crankcase pressure. Just run it without the hoses and see if the acceleration becomes normal.
Did anything abnormal happen before this problem started?
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Old 01-30-2016, 12:06 PM
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Re: Bogging down around 4-5k

No luck does the same with out the hoses on. I took a Video of the misfire counter off my scanner, the weird thing is it jumps around sometimes it will cylinder 1, next time I floor it it would 7, then 3. I can't figure it out for the life of me.
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Old 02-11-2016, 10:19 PM
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Re: Bogging down around 4-5k

Plugged cats? Dirty injectors with poor spray pattern? Does operating temp matter?
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Old 02-11-2016, 10:42 PM
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Re: Bogging down around 4-5k

Do you have the feeling that the misfire counter is counting real misfires? It uses the crank signal to determine misfires, so a not well working CPS could eventually cause misfire codes or even real misfires.
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