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Inconsistent Rough idle, already replaced multiple items

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Old 04-14-2014, 06:22 PM
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Default Inconsistent Rough idle, already replaced multiple items

Hello i just joined this forum hoping to obtain some insight. I have a 2000 Dodge ram 1500 5.9L 4x4 with about 111,000 miles. I bought it in January or 14.

Issue: I am not sure if it would be considered a miss fire but at idle it goes rough than smooths out, than goes rough again and than smooths out etc etc. Not horribly rough but still enough to feel.

replaced: I have already done the cap(mopar), rotor(mopar), ignition coil(mopar), wires(bosch), plugs,(NGK), IAC(mopar), Plenum kit(Hughes), K&N Air filter, Hughes Thermostat, PCV(mopar), belt & tensioner(mopar).

I saw people saying the TPS possibly but if i wiggle ithe connector while running nothing happens and normally if that is bad moving it will kill the engine or make it bog.

Any theories?
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  #2  
Old 04-14-2014, 08:12 PM
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Does it do it immediately on startup, or only after it runs for a few minutes?
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Old 04-14-2014, 10:21 PM
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no it will do it right away. it will either start smooth and jump to rough or the other waqy around. No codes show up and i checked the vacuum lines and they are all good. Im stumped
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Old 04-14-2014, 11:48 PM
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Check the map sensor, if its going bad it can cause the problems your having.
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Old 04-14-2014, 11:53 PM
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Make sure you have wires routed properly
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Old 04-14-2014, 11:55 PM
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How dirty is the Throttle Body?
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Old 04-14-2014, 11:58 PM
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throttle body was just cleaned when i did the hughes plenum kit.
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Old 04-14-2014, 11:59 PM
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which wires?
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Old 04-15-2014, 12:06 AM
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Did u scan the comp? You may have an engine code even though your eng light isnt on--check the vacuum plugs/caps and lines very well disconnect ur tps and see if it makes a dif it is also possible you got a bad idle air control solenoid even though its new--Check the fuel pressure-shrader valve is easy to get to--what u are describing in my experience (no codes) has been a bad iac-Fuel issues usually set a lean code-and tps etc almost always set a code-
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Old 04-15-2014, 12:43 AM
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Quote:
Originally Posted by jmhd1989 View Post
which wires?

Spark plug wires.
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Old 04-15-2014, 11:50 AM
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Quote:
Originally Posted by T-Ram View Post
Did u scan the comp? You may have an engine code even though your eng light isnt on--check the vacuum plugs/caps and lines very well disconnect ur tps and see if it makes a dif it is also possible you got a bad idle air control solenoid even though its new--Check the fuel pressure-shrader valve is easy to get to--what u are describing in my experience (no codes) has been a bad iac-Fuel issues usually set a lean code-and tps etc almost always set a code-

No i have not scanned the computer ill give that a try and see what comes up. thanks for the advise
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Old 04-16-2014, 01:55 PM
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Quote:
Originally Posted by T-Ram View Post
Did u scan the comp? You may have an engine code even though your eng light isnt on--check the vacuum plugs/caps and lines very well disconnect ur tps and see if it makes a dif it is also possible you got a bad idle air control solenoid even though its new--Check the fuel pressure-shrader valve is easy to get to--what u are describing in my experience (no codes) has been a bad iac-Fuel issues usually set a lean code-and tps etc almost always set a code-


Definitely check for any OBD codes, and check the new IAC. Take off the air hat and with the truck running look down in the port where the IAC pintle is and adjust the throttle and see if the pintle moves out and back in. It is a little stepper motor so it will make a jerky motion as it opens and closes. I replaced mine a few years ago and the new one was defective.
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Old 04-16-2014, 10:34 PM
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How much of an interval between the smooth and rough idle? Is it almost a consistent offbeat jiggle while at idle and does it smooth out fine upon acceleration? Sounds a lot like issues I've been having and all things I've tried, besides 01 sensors(denso) and new TPS from dealer. Some have suggested cracked valve seats.
Have you done compression test? Make sure to follow up if you figure it out. Good luck.
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Last edited by ReadRam; 04-16-2014 at 10:42 PM..
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Old 04-17-2014, 11:11 AM
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Originally Posted by ReadRam View Post
How much of an interval between the smooth and rough idle? Is it almost a consistent offbeat jiggle while at idle and does it smooth out fine upon acceleration? Sounds a lot like issues I've been having and all things I've tried, besides 01 sensors(denso) and new TPS from dealer. Some have suggested cracked valve seats.
Have you done compression test? Make sure to follow up if you figure it out. Good luck.
i think we are experiencing the same thing. yes like a rough shake or jiggle. its a few seconds apart from smooth and rough. no have not done compression test. How would we check for cracked seats other than visually?
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Old 04-17-2014, 11:16 AM
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Cylinder leakdown test. Will tell you where compression is escaping. (you can hear it.)
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Old 04-17-2014, 05:59 PM
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So i was messing around again and tried to cover the butterflies to see if it would choke the engine and nothing happened. Didn't even lower rpm's. This means air is being drawn in from somewhere else right? I dont know where though the plenum is brand new along with throttle body gasket. any ideas?
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Old 04-17-2014, 09:10 PM
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IAC allows air in when butterflies are closed at idle, other wise engine would stall at every stop sign. And yes it does sound like the same issue. Jiggle,shake, jitter and every couple seconds a little harder shake with a 50 to 75 rpm drop. Most people would just call it normal for magnum engine, but I've had couple other trucks to compare to. My issues were worse when it's warmer outside. The plenum repair and timing set made an improvement, but not good enough. I'm going to get a leakdown test soon. It's really annoying in stop n go traffic.
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Last edited by ReadRam; 04-17-2014 at 09:31 PM..
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Old 04-17-2014, 10:18 PM
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Quote:
Originally Posted by ReadRam View Post
IAC allows air in when butterflies are closed at idle, other wise engine would stall at every stop sign. And yes it does sound like the same issue. Jiggle,shake, jitter and every couple seconds a little harder shake with a 50 to 75 rpm drop. Most people would just call it normal for magnum engine, but I've had couple other trucks to compare to. My issues were worse when it's warmer outside. The plenum repair and timing set made an improvement, but not good enough. I'm going to get a leakdown test soon. It's really annoying in stop n go traffic.
Ya im going to chang emy plugs back to what was in there when i bought it and do compression test in the process. im going to do it this weekend ill keep you posted. And yes really annoying even if it is "normal'
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Old 04-18-2014, 08:08 PM
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well i checked compression this morning and all cylinders were good. in the process i took out the ngk plugs and put in some autolite xp 5224 plugs. It helped a lot actually. i would say it normalized it even.
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Old 04-19-2014, 06:27 PM
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What did your ngk plugs look like, I mean the center part, clean and white or light tan? Interesting that iridium plugs made a difference.
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Old 04-19-2014, 06:27 PM
 
 
 
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