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david craig
david craig,
Category: Dodge
Satisfied Customers: 911
Experience:  owner/mechanic at 3D Automotive
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I have a 2002 dodge ram 5.9l with i rough running/stalling

Customer Question

Hi i have a 2002 dodge ram 5.9l with i rough running/stalling problem. I have changed the cap, rotor, plugs, and wires. No change. My scan tool shows that the left upstream o2 sensor is at 1.43 volts and the right upstream sensor is reading 4.98 volts. The left downstream o2 is reading .88 volts and the right downstream is at 4.98 also. Coolant temp is at 194 degrees but i am still in open loop on both the left and right bank. The left bank LT fuel trim was at -32 and ST was at 0. The right bank was at 0 for both LT and ST fuel trim. Is this an oxygen sensor problem? Any other advice?
Submitted: 2 months ago.
Category: Dodge
Expert:  david craig replied 2 months ago.

Hi Im David, is there no fluctuation of the sensors?

Customer: replied 2 months ago.
there is no fluctuation at all in the right upstream and downstream sensors. it stays at 5 volts the entire time
Expert:  david craig replied 2 months ago.

.5?

Customer: replied 2 months ago.
no. five volts
Expert:  david craig replied 2 months ago.

5 volts on a scan tool? never seen that

Customer: replied 2 months ago.
okay it is steady at 4.98 volts
Expert:  david craig replied 2 months ago.

that sensor is bad. and so is the downstream... wide open

Customer: replied 2 months ago.
changing the sensors will fix the rough running problem?
Expert:  david craig replied 2 months ago.

the upstream should be fluctuating between .1-.9 thats it. the downstream should settle at around .550. on both banks

Expert:  david craig replied 2 months ago.

what codes are you getting?

Customer: replied 2 months ago.
i understand that. i am trying to figure out if its the sensors of something else. i have no codes at this time.
Expert:  david craig replied 2 months ago.

for you not to be getting codes is insane

Expert:  david craig replied 2 months ago.

replace all 4 sensors with oem dealer. then we will see whats going on. you may also want to do a backpressure test to make sure the converters arent clogged.

Expert:  david craig replied 2 months ago.

you probably need to pressure test the coolant system to make sure youre not losing coolant internally, which would probably be a bad lower intake manifold gasket

Expert:  david craig replied 2 months ago.

hows it going?

Expert:  david craig replied 2 months ago.

please accept the answer and leave a 5 star rating if you were satisfied with my assistance. thank you and have a good day.

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