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-   -   Problems with Hemi getting codes & bad MPG (http://www.ramforumz.com/showthread.php?t=82274)

Hendogg 05-10-2011 12:26 AM

Problems with Hemi getting codes & bad MPG
 
Hi all..
Hope every one is doing better than me.. I have a 2006 Dodge Ram 2500 sport 4x4 4 door.. And the other day on the way home the mil light came on and started running like poo poo.. And put gas in it and it straitened up for about 25 miles and got up to go to work and ran good for about 5 mile and started blowing black smoke like it was a cummins with a chip and i was getting P0171 and P0174 cleared them and they came right back, And my MPG went from 12-13 to 4.2 MPG.. And the 02's were replaced like 6 months ago so i ran down to the auto parts store and warranted them out for a new set 1-1 and 1-2 pre cat and put new OEM plug's in it and a new air filter and oil and oil filter and cleaned the throttle body while i was doing the tune up on it and did a hard PCM reset buy holding the 2 cables together.. And drove it today about 75 miles and the MPG came back up to 13-15 MPG and then drove it about 65 miles and about 2 miles from home the mil light came back on and now i am getting P1128 and P1129 code and don't know what to do to it as of now.. Any and all help would be grate.. And one mite know what to check now.. and the MPG is going back down now as 10.3 mpg and dropping.. Well thanks in advance for any and all help....

Thanks..
Ray H :4-dontknow::4-dontknow::4-dontknow::4-dontknow::4-dontknow::4-dontknow:

RedRam10 05-10-2011 02:28 AM

I wish I had a great answer for you, how mAny miles on the truck? Have you thought about possible catalytic converter blockage?

Hendogg 05-15-2011 01:39 PM

Well the truck has 275,366 on it as of now.. And on the cat's it don't have any on it.. They were cut off about 30,000 miles ago And all new 3in ex was put on it.. Running it with the front o2's in and the rear zip tied to the trans so that it don't turn the CEL light on.. And it just stated getting like 4 mpg and replaced the front o2's and it turn off the light for about 4 days and my mpg came back up to 12.5 to 14 mpg.. But when it the CEL came on it had these codes P1128 and P112.. And now it is getting 8.5 to 9.5 MPG...

Hendogg 05-15-2011 01:41 PM

Sorry not P112.. it was so post to Be P1129

chefred112 05-15-2011 02:18 PM

hmmm..this is one I haven't seen before...

P1129-CLOSED LOOP FUELING NOT ACHIEVED

chefred112 05-15-2011 02:20 PM

P1128 - CLOSED LOOP FUELING NOT ACHIEVED - BANK 1
P1129 - CLOSED LOOP FUELING NOT ACHIEVED - BANK 2


When Monitored:
Engine running in closed loop mode.

Set Condition:
Enable conditions are met and the 02 sensor has not been in closed loop control at least once on each of the two consecutive trips, the MIL illuminates and the DTC is set. Two Trip Fault. Three good trips to turn off the MIL


Possible Causes

RESTRICTED FUEL SUPPLY LINE
FUEL PUMP INLET STRAINER PLUGGED
FUEL PUMP MODULE
O2 SIGNAL CIRCUIT
O2 RETURN CIRCUIT
O2 SENSOR HEATER OPERATION
O2 SENSOR
MAP SENSOR OPERATION
ECT SENSOR OPERATION
ENGINE MECHANICAL PROBLEM
FUEL FILTER/PRESSURE REGULATOR (HIGH)
PCM


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