Engine sputtering and rpm fluctuations and stalling in reverse
#1
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I've been having an occasional problem with a "sputtering" engine on my 1999 Dodge Durango 4x4, 5.9 liter, automatic, 225000 miles.
Here's the scenario: ......The engine does great when I am accelerating or cruising at high speeds. A frequent problem then occurs when I let off the gas in order coast through a yield or come to a stop. At a stop the rpm will drop low and the engine will sputter and it will the go back to normal and will run great once I accelerate again. This problem only occurs when I am at a stop, when I’m in parked, and when cruising at <10 mph. It does not happen all the time but it is getting worse and is doing this more frequently. When I am also at a stop there is some mild fluctuation in the rpm (going up and down only mildly). For example, it idles at about 600, so the rpm gauge will fluctuate to a high 650 and low 550. I am not getting any "Check Engine Light." The other problem is that the truck will stall when in reverse during cold starts and after it warms up it have no problem reversing. It only does this when it has been sitting for awhile.
Here's what I've tried so far: ......Installed new plugs, cleaned cap & rotor, installed new Idle Air Control Valve (IAC) & Throttle Position TP Sensor (TPS). I have recently just replaced the pcm too. I also had a remanufactured transmission put in about 2 years ago and the truck shifts just fine. I’ve read that it can be an torque converter problem due to some of my symptoms
Any advice-help would be appreciated. Thanks!
Here's the scenario: ......The engine does great when I am accelerating or cruising at high speeds. A frequent problem then occurs when I let off the gas in order coast through a yield or come to a stop. At a stop the rpm will drop low and the engine will sputter and it will the go back to normal and will run great once I accelerate again. This problem only occurs when I am at a stop, when I’m in parked, and when cruising at <10 mph. It does not happen all the time but it is getting worse and is doing this more frequently. When I am also at a stop there is some mild fluctuation in the rpm (going up and down only mildly). For example, it idles at about 600, so the rpm gauge will fluctuate to a high 650 and low 550. I am not getting any "Check Engine Light." The other problem is that the truck will stall when in reverse during cold starts and after it warms up it have no problem reversing. It only does this when it has been sitting for awhile.
Here's what I've tried so far: ......Installed new plugs, cleaned cap & rotor, installed new Idle Air Control Valve (IAC) & Throttle Position TP Sensor (TPS). I have recently just replaced the pcm too. I also had a remanufactured transmission put in about 2 years ago and the truck shifts just fine. I’ve read that it can be an torque converter problem due to some of my symptoms
Any advice-help would be appreciated. Thanks!
#2
#3
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since you already replaced my top 2 suggestions (IAC and TPS) im going to suggest looking at the battery, take the erminals off and clean them real good, then put em on nice and tight, if that doesnt help look into a new battery, avg lifespan of a battery in these trucks seems to be about 4 years
#4
#5
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check the terminals and make sure they're not corroded, make sure to check the terminals where they clamp onto the wires too. If they are, clean them with a wire brush or even replace them. A bad connection to the battery to cause this issue and if it is the problem it's a relatively easy and cheap fix
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#8
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To: that_guy and hydrashocker
Well I cleaned the terminals and the rpm did not drop low real low like before when I took it for a test drive. But the rpm still fluctuates mildly when it is at a stop as if it wants to drop low. The fluctuation is very mild though.Example, my truck idles at 650 and the rpm gauge will drop to 600 then bounce back to 650, that's how it fluctuates. I can tell that when it does this the engine fells like it wants to sputter but the rpm doesn't fall enough like it did before I cleaned the terminals. The truck also still stalls in reverse on a cold star
Well I cleaned the terminals and the rpm did not drop low real low like before when I took it for a test drive. But the rpm still fluctuates mildly when it is at a stop as if it wants to drop low. The fluctuation is very mild though.Example, my truck idles at 650 and the rpm gauge will drop to 600 then bounce back to 650, that's how it fluctuates. I can tell that when it does this the engine fells like it wants to sputter but the rpm doesn't fall enough like it did before I cleaned the terminals. The truck also still stalls in reverse on a cold star
#9