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  #1  
Old 06-11-2010, 10:51 PM
jpaulson12 jpaulson12 is offline
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Default 1998 Ram 318 runs rough at low RPMS

Hi, just bought my 1998 Dodge Ram V8 5.2 liter last week. It runs rough like its missing once I get into 4th/5th gear. It does it most noticeably when its at low RPMs and under acceleration. I replaced the plugs, cap, rotor and plug wires and that did not help. The check engine light is on throwing code P0138 - oxygen sensor bank 1 sensor 2.

When I tow my boat, putting the truck under more load, the truck runs considerably worse in 4th/5th gear. It seams to idle and run through 1-3rd gears smoothly..

Does anyone have a plan on what I should do to systematically troubleshoot? should i just replace the O2 sensor or could it be something else cause the O2 sensor to fault?

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Old 06-13-2010, 09:26 PM
jpaulson12 jpaulson12 is offline
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UPDATE - I replaced the O2 sensor downstream and it still has the hesitation. It does ping so Im thinking it might be the plenum gasket, I will try and tackle that over the next couple of days. I noticed that the oil pressure is normal - around 80 or so on the guage, after about 20 miles of travel, it slowly creeps down to about 40, would this further indicate a plenum leak? I just bought the truck last week and flushed the cooland - filled it up, also just noticed the reserve tank is almost empty...
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Old 06-13-2010, 09:35 PM
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Are you going through any oil ? Might not be a bad idea to take a compression test first . I would do that just incase you need to remove the cylinder heads .
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Old 06-22-2010, 01:48 AM
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To my disappointment, after replacing the plenum gasket and intake manifold gaskets, Im still having the same problem. The plenum gasket was surely blown, but the problem hasnt gotten any better. I even put new plugs in it while i was in there. I also am noticing that my coolant is always a dark color. I flushed the coolant twice in the last week and each time, the coolant becomes a dark rusty color only after a short period of time.. is it mixing with the oil somehow??
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Old 06-23-2010, 10:37 AM
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A dark rusty color coolant is probably a dirty cooling system you may need to flush the cooling system, a head gasket leak would more than likely produce oil in the coolant or a white discoloration in the oil.
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Old 06-23-2010, 11:34 AM
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i would take the iac censor out and give it a good cleaning also my buddies truck was doing the same thing and much to our supprise we took some throttle body cleaner to it and a gental wipe truck runs smooth idles smooth its worth a shot only 2 t25 torks bolts holds it in and thats it and if ya got any carb cleaner or tb cleaner laying around it don't cost anything but these do get pretty nasty with time so
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Old 07-02-2010, 03:13 PM
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I would agree with whi3500mag. Taking the throttle body off and giviing it a good cleaning will be wonders. IAC (Idle Air Control) could be real dirty with carbon that is located on the TB. Clean that up should make a big difference.
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