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  #1  
Old 05-07-2013, 05:56 PM
mbennett mbennett is offline
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Default 2008 ram needs help

i have a 2008 ram 1500 4.7L. satrted being sluggish on take off fuel mpgs dropped about 4 mpg. seems to have a misfire but not throwing codes.
this is what ive changed. all the plugs all the coils new air filter new o2 sensors. had the injectors checked and the cats. seemed to be a little better after changing the plugs but still sluggish and barely pulls itself down the road. any help would be nice
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Old 05-08-2013, 02:02 PM
trunk2005 trunk2005 is offline
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I have heard that the 4.7 has had problems with sludge in the engine I don't know if that is your problem but I may be a start for you.
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Old 05-08-2013, 05:53 PM
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SuperiorStyles SuperiorStyles is offline
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Do a PCM restart by disconnecting your postive and negitive I say both just to make sure it clears. With the battery disconnected turn the key to the on position and press the brake pedal and while it sits for a while disconnected go clean the throttle body and run good fuel cleaner through the gas tank and reconnect the battery and go fill it up with chevron 93 octane .
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Old 05-08-2013, 06:00 PM
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snrusnak snrusnak is offline
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How many miles are on the truck? Did you replace with oem spark plugs? The 08+ 4.7L uses specific plugs for the intake side(8 plugs) and exhaust side(8 plugs). If you used an off the shelf plug it may be part of the issue. The intake sides I think are good for either 30k or 50k miles. The exhaust sides are good for 100k miles.

Hard to believe there's no code if it's running that poorly. Maybe the crank/cam position sensor(s)....not sure which it has.
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Old 05-08-2013, 06:20 PM
mbennett mbennett is offline
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its got 100k on it now. hard to believe it would be sludge i change the oil on the first of every month use royal purple and a quart of lucas everytime. i use it for work so they pay for my oil changes. yes changed the plugs with the oem bosch plugs from the dealership. copper intake and iridium exhaust plugs. havent tried pcm reset about to step out now and try that. thinking about dropping the tank and checking the fuel pump sock
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Old 05-08-2013, 07:40 PM
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snrusnak snrusnak is offline
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I'd check fuel pressure, then spark at each cylinder. Maybe you need to check compression too.
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Old 05-09-2013, 11:19 PM
mbennett mbennett is offline
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ok i checked the fuel pressure. key on 50. running at idle 60.
how would you check the volume? through the rail im guessing but would you have to bypass the relay
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Old 05-10-2013, 07:17 AM
Chris65 Chris65 is offline
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U checked the pressure on the rail?
If the pressure is in spec it should be ok.
Sure you ain't got no vacuum problem somewhere?
It's very hard to say anything and don't see the car.
You should start with clear error memory-even no codes are stored and set the readiness codes on zero. The readine ss codes you need the obd tool.
Then drive 20 miles to set the codes new.
Then start with troubleshooting from the beginning.
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Old 05-10-2013, 09:27 AM
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snrusnak snrusnak is offline
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I agree if fuel pressure is good fuel is likely not the issue. I'd move to spark next.
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Old 05-10-2013, 09:39 AM
Chris65 Chris65 is offline
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Without a scan tool its hard work and lots of money.

Read the sensor signals-maf, map, egt, cranksensor, intake temp sensor, o2sensor-there you see where you need to look at. Changing parts, especially when you have no control if or what changes in the readings is like u search for the lipsick in a woman's pocketbook.
And can get expensive.
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