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  #1  
Old 07-17-2013, 10:03 AM
Pike12 Pike12 is offline
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Default Always running rich! No MIL!

I have an 2003 dodge ram hemi with a cold air intake, Throttle spacer and cat back exhaust, problem is that at a cold start or after the truck has sat about 5 to 6 hours I will start it and it will chug, run rough, stumble or whichever you prefer, this rpm surge or rough idle only lasts about 30 seconds and then stops. Had a reputable shop keep it over night and run some tests they said its always running rich. The shop told me it could be a o2 sensor reading funky, or a sticky injector valve, which seems legit I am going thru college for automotive so I do know most things but I was wondering if anyone else has had this problem and what they have done to fix it.
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Old 07-17-2013, 10:09 PM
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No check engine light?

Do you have an aftermarket thermostat?

If it's actually rich it should throw a check engine light and code. What "tests" did they do?
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Old 07-18-2013, 05:52 PM
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I would pull the tb spacer (does the hemi no good), also, have you pulled the tb to clean it? what plugs are you running? also want to know what tstat your running. After motor is warmed up, where does the tstat needle sit?
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Old 07-19-2013, 12:08 PM
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The test the guy did was to monitor the fuel trims that's how he determined its running rich. I have OE champion copper plugs, OE thermostat and the coolant temp sits at 204F at running temp, plus the truck did this before I put on the spacer. And I have cleaned the throttle body. Hope that info helped!
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Old 07-19-2013, 12:36 PM
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I'd recommend an injector service, sound like a leaking injector(s) to me...
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Old 07-19-2013, 07:29 PM
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What was the a/f reading when they were testing it?
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Old 07-19-2013, 10:14 PM
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Not sure what the reading was, I just know rich, it wasn't quite 8.0 to 1
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Old 07-21-2013, 10:05 AM
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I really am not familiar with these trucks yet and how they collect their data for their algorithms. If oxygen sensors have been ruled out, I think there could be a sensor giving false readings telling the computer it's getting more air than it really is. I'd look towards which ever sensor whether it's a MAP or MAF that measures incoming air.
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Old 07-21-2013, 05:10 PM
Pike12 Pike12 is offline
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I was thinking tps, but it's inside the electronic throttle.
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