Stumped: CEL and Running Rough
#1
Stumped: CEL and Running Rough
Hello All,
I got a 99 Ram 1500 5.9 that has been giving me hell ever since I got it a couple months ago. I recently installed the plenum kit from hughes along with the upstream o2 sensor, plugs, wires, cap, and rotor and the truck still runs like crap. I have CEL codes: P0132, P0135, P0302, P0138.. I used autozones scan tool and both up-downstream o2 sensors read 1volt steady with a warm running engine.. I replaced the plug wire for cylinder 2 and still no change. While driving the truck it misses hard especially in the low rpms (1-1.5 is really rough) Idle isnt great but it does hold pretty steady. PLEASE HELP!!!
I got a 99 Ram 1500 5.9 that has been giving me hell ever since I got it a couple months ago. I recently installed the plenum kit from hughes along with the upstream o2 sensor, plugs, wires, cap, and rotor and the truck still runs like crap. I have CEL codes: P0132, P0135, P0302, P0138.. I used autozones scan tool and both up-downstream o2 sensors read 1volt steady with a warm running engine.. I replaced the plug wire for cylinder 2 and still no change. While driving the truck it misses hard especially in the low rpms (1-1.5 is really rough) Idle isnt great but it does hold pretty steady. PLEASE HELP!!!
#2
Grab the 98-99 Service manual from here. Dig thru the wiring diagrams, and find out why the PCM thinks your O2's are shorted to voltage.....
Make sure your wires are ran per the TSB for plug wire routing. (in the faq section)
Disconnect the O2 sensors for the moment, and see if the truck runs any better.
How's your cat?
Make sure your wires are ran per the TSB for plug wire routing. (in the faq section)
Disconnect the O2 sensors for the moment, and see if the truck runs any better.
How's your cat?
#4
Grab the 98-99 Service manual from here. Dig thru the wiring diagrams, and find out why the PCM thinks your O2's are shorted to voltage.....
Make sure your wires are ran per the TSB for plug wire routing. (in the faq section)
Disconnect the O2 sensors for the moment, and see if the truck runs any better.
How's your cat?
Make sure your wires are ran per the TSB for plug wire routing. (in the faq section)
Disconnect the O2 sensors for the moment, and see if the truck runs any better.
How's your cat?
#5
#6
Update: After removing the o2 sensor I went for a drive, the truck was more responsive but I still experienced shuttering/missing in the low rpm range (primarily in 4th gear) Also, I took a volt meter to the plug prongs and got a reading of approximately 4 volts on the o2 side, and a reading of .3 on the heater side (warm running engine) I checked the spark plugs as well and they still appear in new condition.
#7
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#9
PCM gives O2 sensors five volt reference signal, sensor modifies the signal. PCM gets back 0-1 volt, .5 being 14.7:1 mixture ratio. (why you see it bouncing around as PCM changes mixture.) Heater just gets the O2 ready faster. Heater circuits are tied to ASD relay. Should see 12 volts on the heater circuit, if you don't, need to find out why.
Stuttering in fourth is a sure sign of an engine miss. My guess would be, your crank sensor is beginning to fail.
Stuttering in fourth is a sure sign of an engine miss. My guess would be, your crank sensor is beginning to fail.
#10