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I've been reading through this subforum but can't seem to find a thread with the exact same symptoms.
My 4.0 has 125K on it. It cold starts just fine but almost always settles to a high idle. Right around 1500rpm. On occasion it will idle at 1800rpm. Clutching in slightly to put a load on it will drop the idle back down to 900'ish if I do it right. But the next time I come to a light it will idle again at that high 1500. So far I replaced the IACV.
This started when I replaced the vacum line going to the charcoal cannister. Do I need to recalibrate that sensor after diconnecting the vacum to it? I have reset the ecu and the only code that comes up is "General Emissions" or some BS like that. Also, I'm getting pispoor fuel econ. So its probably running pig rich and thus causing the high idle but why?
Also, idling for extended periods(5+ minutes) will drop it to a super low stumbling idle. On occasion it can't recover from the stumble and will die. But the truck has done this little nuance since I got it over 30K ago. It never bothered me because I still got good fuel econ.
My 4.0 has 125K on it. It cold starts just fine but almost always settles to a high idle. Right around 1500rpm. On occasion it will idle at 1800rpm. Clutching in slightly to put a load on it will drop the idle back down to 900'ish if I do it right. But the next time I come to a light it will idle again at that high 1500. So far I replaced the IACV.
This started when I replaced the vacum line going to the charcoal cannister. Do I need to recalibrate that sensor after diconnecting the vacum to it? I have reset the ecu and the only code that comes up is "General Emissions" or some BS like that. Also, I'm getting pispoor fuel econ. So its probably running pig rich and thus causing the high idle but why?
Also, idling for extended periods(5+ minutes) will drop it to a super low stumbling idle. On occasion it can't recover from the stumble and will die. But the truck has done this little nuance since I got it over 30K ago. It never bothered me because I still got good fuel econ.
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