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  #1  
Old 02-04-2013, 04:50 PM
kking kking is offline
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Default 4.7 misfire between 1600 and 2200 RPMs

Hello All!

I'm new to the forum and excited about the knowledge base here. I'm hoping you all can help with a problem.
My explanation may seem lengthy, I'll try and keep it short, but heres what she's doing.
Idle's fine, accelerates fine, however at speeds around 35 to 40mph, RPM's always around 1600 to 2200 there feels like a missfire. It doesnt happen in the lower gears its only when shifted out to 3rd and fourth, seems to be worse in overdrive so I seldom drive in OD.
I've cleaned the throttle body and really it runs great except for the occasional miss.
I recently located and repaired a vacume leak (code P0456), but the miss is still happening.
I'm not sure if its in the engine or transmission though, my truck is 4X4 and has the shifter in the floor, you can really feel the miss if your hand is on the floor shifter.
The trouble began when i was pulling a trailer with a couple of 4 wheelers, I was pulling away from a light and hit the O/D switch on the gear shift to turn off the O/D, i was up to speed enough that it shifted into overdrive as I had already turned it off, when I realized it had shifted to overdrive i turned it back off and it downshifted out of overdrive. I have no idea if this has anything to do with my troubles or not, but since then it has had the missfire felling to it.
Thanks for any and all help, I hope to one day return the favor if I can.
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  #2  
Old 02-05-2013, 07:45 AM
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tjbiker031 tjbiker031 is offline
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Well, the ignition system has the most load on the system cruising around 45mph and acceleration. So its possible that the plugs are just going bad. I would replace those first.
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Old 02-05-2013, 09:24 AM
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Since you didn't metnion and codes in the PCM, I would get my hands on a scan tool with OBDII monitor capability and find out which cylinder is acting up before I randomly threw parts at it.
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Old 02-05-2013, 09:50 PM
Greg Mc Greg Mc is offline
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I recently bought a 2007 and it does the same thing. According to the service records the plugs and throttle body were cleaned at 44k and it just rolled over to 95k. I am not getting any codes but plans are to start with a plug change first. Good luck, let us know what you find.
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Old 02-05-2013, 10:39 PM
kking kking is offline
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Tell me if this sounds crazy, but because there are no codes present, and the CEL isn't on I'm starting to think it may be in the tranny. At idle it's runs smooth as silk, 1st and 2nd gear it never acts up, only after shifting into third will it do it. It usually happens when I'm shifted into third with the OD off and encounter a small incline, it's like it wants to downshift but only hiccups. If I do drive in overdrive it occurs more often. Anyone ever heard if such, it just doesn't strike me as a motor issue, but I've never heard of a tranny with a hiccup (for lack of a better description).
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Old 02-06-2013, 07:56 PM
Greg Mc Greg Mc is offline
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I think light throttle and low rpm is more likely the issue and those conditions contribute to a misfire but I could be wrong. Does it have the same issue if you consistently accelerate through the gears and reach about 70 mph. I haven't tested mine with overdrive or tow/haul button in different positions.
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Old 02-06-2013, 09:18 PM
kking kking is offline
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No issues at all from 0 to 70 under steady acceleration. In fact even cruising at 40mph if I accelerate enough to make it downshift there is not so much as a hesitation. It only happens between 1600 and 2100 rpms on a slight incline, you know that spot where the truck starts to slow down so you give it slightly more gas but it hasn't downshifted yet. Just when you expect it to downshift it hiccups and stays in the higher gear. I can make it downshift if I give it enough gas, then it downshifts like it should with no problem. I am going to have my tranny flushed and filter changed this weekend to see if it helps. I will update afterwards.
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Old 03-03-2013, 07:54 AM
Greg Mc Greg Mc is offline
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Any update on your truck king? Did your tranny flush and filter change affect your misfire.
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Old 03-18-2013, 12:45 PM
Theonidas Theonidas is offline
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I just bought my truck last week, took it across the state and back, and started noticing the exact same thing you described on the way home last night. Have you had any luck?

Mine also feels like it wants to downshift but doesn't and just "bucks" a little bit. I was thinking about the tranny flush and filters too but would love to hear if it worked for you.
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Old 04-02-2013, 05:30 PM
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02Kingstonram 02Kingstonram is offline
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Throw some injector cleaner in the tank and see if you have gremlins?
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