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  #1  
Old 11-14-2011, 11:57 PM
Zobie08 Zobie08 is offline
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Default Poor idle, poor mpg, shift points all over the place

Hello All,

I hope someone can help me out. I have a 2006 Dodge 1500 4x4 Big Horn with 62,000 miles. Engine is 4.7 V8 and automatic transmission.

The truck has been acting erratic lately. It is equipped with fuel economy digital readout. I used to get 16 to 17 mpg, now it has dropped to 14 to 15 mpg. The digital economy readout should change during driving, fluctuating up and down depending on how I drive. Now, most of the time the readout stays on a given number all day...for instance it stayed at 14.9 today and I drove it like a baby.

The shift point into overdrive used to occur at about 2000 rpm and bump down to about 1600 when it went into O.D. However, it took miles of driving today at 2500 rpm before it finally went into O.D. Normally O.D. would kick in at about 55 to 60 at 2000 RPM. Now, it seems it'll wait forever to kick to O.D. I live in a flat area, so it's not because I'm going uphill.

Two weeks ago, the truck suddenly died on the highway. Luckily I was almost home, so I coasted into the driveway. After a few attempts, the engine fired right up. Hasn't quit on me since.

Tonight it just seemed as if the truck was fumbling to get into the right gear. My idle is terrible as well. It used to idle at about 700 to 800 rpm, now it fluctuates up and down from 1000 to 1500 rpm.

I have 3 symptoms, but hopefully one problem. Poor gas mileage, poor idel and unreliable shift points. Any idea what it could be?

Also, I have cycled the ignition switch on and off 3 times, leaving it on the 3rd time. (If you start the engine doing this, you've turned the key too far.) In the odometer field it will tell you of any trouble codes, but it says 'done', so as far as I know the self diagnostic isn't picking up any trouble codes.

I have never towed anything with this truck and haven't hauled anything except maybe 200 pounds in the bed. I don't drive the truck like an idiot.

Any help is appreciated. Thanks
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  #2  
Old 11-15-2011, 12:02 AM
erm
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There is a fuel, timing or ignition issue here.

When was the last time you:

1. Changed plugs
2. Changed plug wires
3. Cleaned your throttle body
4. Cleaned or replaced your EGR valve
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  #3  
Old 11-15-2011, 12:24 AM
TNC TNC is offline
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All good possibilities, Maddog, but I was wondering. I'm not familiar with how the Dodge reads trouble codes, but I would venture a guess that since it's OBDII, it's much like the later model Chevy's I have and had. Ignition issues like plug misfiring, many throttle body issues, and EGR issues are almost always read by the OBD system, aren't they? Over many years I've seen a few on mine and other's vehicles even when the issue wasn't causing a noticeable running issue. Some of the OP's descriptions sound a bit computer related. Maybe the OBD system isn't doing its job because of an issue in the ECM.
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Old 11-15-2011, 12:58 AM
Zobie08 Zobie08 is offline
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I'll be spending some time this weekend looking at those items you mentioned. What really alarms me is that the engine would just quit with no warning! With vehicles having so much electronics involved these days, it may be something that is over my head. This problem may cost me some bucks! However, I'm hoping its something simple...lol. I'm the second owner of the truck, so I'm gonna be looking to see if there was any type of recall that I should be aware of.
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Old 11-15-2011, 01:50 AM
TNC TNC is offline
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You mention that you're the second owner. Are you sure there's not an aftermarket chip or such with the pickup? Internet diagnositcs are tough, and often electrical gremlins can do some funky things that may not be related to the ECM and/or sensors that OBD won't pick up.
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Old 11-15-2011, 11:50 AM
Zobie08 Zobie08 is offline
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I don't know if it has an aftermarket chip or not. It does not have a programmer with it.

I have noticed the truck seems to do better when the air temperature gets below 50. Could be an IAT sensor acting up.

I'm gonna take it to the parts store and have them pull the codes to see if they get anything. I've heard too many problems can actually give a 'no code' sometimes with the onboard diagnostics. Dunno for sure though.
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Old 11-15-2011, 12:06 PM
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GeauxHunting GeauxHunting is offline
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My 4.7 was dying at highway speeds for a while and I replaced my EGR valve and she hasn't died since then. I was also having rpm fluctuation at idle and low speeds. I was not having erratic shift points though.
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Old 11-15-2011, 06:38 PM
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14 mpg sounds decent lol im getting 10 ....hope you figure the issue out.
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Old 11-15-2011, 10:54 PM
Zobie08 Zobie08 is offline
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I took it in today to have the codes checked....no codes showed up...lol. I'm gonna replace the IAT sensor and the EGR valve and see if that has any effect. It ran like crap today when the air temp was in the mid 50's. It ran better tonight when the air temp dropped bit. (I need R2D2 to look at it...after all he did fix the Millenium Falcon...lol)

I'm hoping for something simple since no codes appeared. It's frustrating driving because of the sluggish feeling that it has to it on top of everything else.
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Old 11-15-2011, 11:00 PM
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If you are going to try to do it yourself be prepared to get pissed. The egr valve is a pain in the ass to get to on the 4.7s. I tried and gave up and brought it to the shop for them to do it.
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