03 Ram 4.7 Rough Idle - DodgeForum.com



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03 Ram 4.7 Rough Idle

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Old 03-24-2013, 02:04 PM
Scoty89 Scoty89 is offline
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Default 03 Ram 4.7 Rough Idle

I have a 2003 Ram 1500 with the 4.7 L that has a rough idle at a stop light or sign. Sometimes it idles bad enough that it dies but it will restart. It doesn't set any DTC's. I have tried a new throttle position sensor and downstream O2 sensor. If i unplug the downstream O2 sensor the truck seems to run fine. Any one have any ideas? Any help will be appreciated
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Old 03-24-2013, 02:29 PM
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jasonw jasonw is offline
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By downstream, you are referring to the sensor after the catalytic converter, correct? Just making sure, some people confuse the downstream/upstream definitions.

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Old 03-25-2013, 09:50 AM
p38251 p38251 is offline
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When was it's last tune up. throttle body cleaning.
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Old 03-25-2013, 07:39 PM
Scoty89 Scoty89 is offline
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Yes i am referring to the one after the converter. As far as the tune up i don't know. My friend has owned it since May and they haven't done anything to it. i did check the throttle blade. I didnt see any build up on it. And i did remove the IAC and check it. There wasnt really build up on it either. I did use a rag and wipe it clean.
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Old 03-30-2013, 03:31 PM
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I had a misfire in one of my cylinders. One of my plugs was smashed and had the incorrect gap. It ran rough, and I would pull up to a stop light and the truck would just shake so bad. My truck didnt throw any codes for a day or two. Might pull the plugs and check the gaps and see if they need replaced.
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Old 03-30-2013, 04:47 PM
p38251 p38251 is offline
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Start with a tune up. Unless the previous owner knows when it was done.
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