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  #1  
Old 07-15-2013, 04:42 AM
Craigs98Dakota Craigs98Dakota is offline
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Join Date: Jul 2013
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Vehicle: 1998 Dodge Dakota
Trim Level: SLT
Color: Grey
Engine: 1998-2003 - 5.9 L (360 cu in) Magnum V8, 250 hp (190 kW)
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Default Rough idle

I just did a 318 to 360 swap in my 98 dakota. I've had several problems so far with the swap. Along with the 360, I upgraded the transmission to a 46re, the torque converter and transmission are out of a 97 ram 1500 2-wheel drive and the 360 is out of a 99 ram that had a rough idle problem. As I had had to replace the oil pan I went ahead and replaced the rear main seal. While in there I inspected the main bearing and replaced them. Engine has practically all new gaskets minus head and intake gaskets. After I got the engine and transmission into the dakota and got it running it had a rough idle still. Found out that there was something wrong with the distributor cap because cylinder #4 wasn't receiving spark. Replaced cap and the idle smoothed out a little. Did some more research and came across that maybe the cam sensor might be bad. Since I had a good running 318 I could use sensors from I grabbed can sensor and idle air control sensor and even then the idle smoothed a little more, but still has a rough idle. Could anyone help me with brainstorming this or has anyone come across this before?
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  #2  
Old 07-16-2013, 12:07 AM
Craigs98Dakota Craigs98Dakota is offline
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Vehicle: 1998 Dodge Dakota
Trim Level: SLT
Color: Grey
Engine: 1998-2003 - 5.9 L (360 cu in) Magnum V8, 250 hp (190 kW)
Rep Power: 0
Rep:10
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Update, I'm hooking my truck up to a scan tool tomorrow to check timing.
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  #3  
Old 07-17-2013, 06:36 PM
jamesslcx jamesslcx is offline
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Join Date: Nov 2011
Location: Pleasant Shade
Posts: 486
Vehicle: 2003 dodge dakota
Trim Level: sxt
Color: maroon
Engine: 1997-2003 - 3.9 L (238 cu in) Magnum V6, 175 hp (130 kW)
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Also check for vacuum leaks. How does the truck run on the road? Any codes set? Some 5.9's idle rough naturally.
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  #4  
Old 07-17-2013, 06:44 PM
Craigs98Dakota Craigs98Dakota is offline
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Join Date: Jul 2013
Posts: 4
Vehicle: 1998 Dodge Dakota
Trim Level: SLT
Color: Grey
Engine: 1998-2003 - 5.9 L (360 cu in) Magnum V8, 250 hp (190 kW)
Rep Power: 0
Rep:10
Craigs98Dakota is on a distinguished road
Default Update

After getting it into the shop I found out that my #4 cylinder wasn't getting compression. Where as the other 7 were getting 130psi. Did a cylinder leak down test and found out that the intake valve was sticking open. Pulled the valve cover and checked for a bad spring and to see the lift I was getting from the cam. Those checked out, so I pulled the rocker arms. The intake rocker only had a half moon wear pattern where as the exhaust had a full moon wear pattern. Replacing the rocker tomorrow, but as a safety, incase the valve is sticking, I'm going to replace the valve as well. Everything else checked out okay mechanically.
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  #5  
Old 07-17-2013, 09:58 PM
jamesslcx jamesslcx is offline
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Join Date: Nov 2011
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Posts: 486
Vehicle: 2003 dodge dakota
Trim Level: sxt
Color: maroon
Engine: 1997-2003 - 3.9 L (238 cu in) Magnum V6, 175 hp (130 kW)
Rep Power: 8
Rep:10
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Craig, you are the man. Glad you found the problem.
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