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99 dodge ram runing rough and stalling
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cwest3355
New User
Aug 8, 2011, 6:16 PM
Post #1 of 2
(3594 views)
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99 dodge ram runing rough and stalling
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1999 dodge ram 1500 5.9magnum 4x4 158,*** miles
The truck has had this problem for a while. When started the truck idles perfect but after it has been running for a couple minutes the trucks starts making a lound hissing noise then begins missfiring and eventully dies I have narrowed down the hissing noise to the IAC valve. It runs extremely rich when it starts to stall/misfire and the hissing noise becomes louder. I checked the downstream oxygen sensor and it reacted like it should the voltage when up when it started running rich but for some reason the voltage does not fluctuate back and forth like the computer is not reacting to it. What are your thoughts on this?
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cwest3355
New User
Aug 8, 2011, 6:31 PM
Post #2 of 2
(3575 views)
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Re: 99 dodge ram runing rough and stalling
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Its the post cat oxygen sensor idk if it makes a differnece i havent checked the precat sensor
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