magnum 3.9 floods when starting
#1
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Hello all. I need some advice from some of the fuel injection gurus
I have a 2003 Dakota quad cab with a magnum 3.9. About 50% of the starts are normal, but the other 50% the engine will crank for 3-5 seconds and sputter to a start, then slowly increase in speed and smooth out until it hits idle speed, all the time reeking of unburned gas. This is usually accompanied by a blast of smoke out the exhaust too. Once it reaches idle, it's OK. I suspect I have an intermittant sensor, but don't know enough about the fuel injection system to know which one(s). I have cleaned the K&N air filter, run some injector cleaner through, and even replaced the IAC valve on spec. Still no improvement. Anyone have any ideas?
Thanks in advance.
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Thanks in advance.
#3
#7
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Well, I got the MAP sensor installed, problem remains.
I just found a post on how to check the codes, did that, and found P032, P037, and P132, which all refer to O2 sensors. Maybe my truck's actually trying to talk to me. I'm a bit unclear, however, as to how many O2 sensors there are (I figure at 260K I may as well replace them all ) Is there 4 in total, left and right upstream and left and right downstream? Any help would be appreciated. Thanks in advance.
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