Aftermath of 3.8L engine swap
10-07-2014, 06:53 PM
#1
JK Newbie
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Aftermath of 3.8L engine swap
Hi Jeepers!! Complete engine rebuild done after a oil consumption issue spun a bearing while my dipshit kid was using it to commute to and from work
....engine is back in the jeep. Starts and runs...rough. Sounds like it has a miss in it. I did notice last night when it was kinda dark right after I started it I saw what looked like spark coming from my plug wires right at the connection to the plugs. all 4 on the drivers side were doing it. Anyone know whats going on with this????
....engine is back in the jeep. Starts and runs...rough. Sounds like it has a miss in it. I did notice last night when it was kinda dark right after I started it I saw what looked like spark coming from my plug wires right at the connection to the plugs. all 4 on the drivers side were doing it. Anyone know whats going on with this????
10-07-2014, 07:41 PM
#2
JK Junkie
Unless you swapped in a V8 the driver side should only have three..
Who swapped the motor in? There have been several threads on motors running rough after a swap. Did you check it for any codes first?
Who swapped the motor in? There have been several threads on motors running rough after a swap. Did you check it for any codes first?
10-08-2014, 01:47 AM
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It could just be a simple fix as replacing those spark plug wires. Are they new or still the originals. Usually seeing sparks like that indicate worn out/damaged wires....
10-08-2014, 02:31 AM
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Sorry...3. All the work was done by me besides the obvious machine shop stuff. This thing only had 47 K miles on it too.
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10-10-2014, 03:35 PM
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I recently finished my 3.8 swap. My engine sat in the garage for at least 5 years being rotated occasionally by me and the previous owner.
First start on mine produced p0300 dtc's. I was very concerned. I started with wires and isolated which cylinder was not firing. I found there was spark at the wire. Next I swapped the plug with one from the old engine. At the same time I put injector cleaner in the tank. It gradually got better over the next several min of running. I only let it run for a few min at a time, but it was very rough.... Like it was running on 5 cylinders
Eventually, it worked itself out and finally the MIL turned off on its own.
Perhaps your wires are nicked? Not fully seated? Plugs cracked or not tight? I hope this gives you a place to start.
-Chris
First start on mine produced p0300 dtc's. I was very concerned. I started with wires and isolated which cylinder was not firing. I found there was spark at the wire. Next I swapped the plug with one from the old engine. At the same time I put injector cleaner in the tank. It gradually got better over the next several min of running. I only let it run for a few min at a time, but it was very rough.... Like it was running on 5 cylinders
Eventually, it worked itself out and finally the MIL turned off on its own. Perhaps your wires are nicked? Not fully seated? Plugs cracked or not tight? I hope this gives you a place to start.
-Chris
Last edited by RubiKean; 10-10-2014 at 03:39 PM.
10-10-2014, 06:27 PM
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I recently finished my 3.8 swap. My engine sat in the garage for at least 5 years being rotated occasionally by me and the previous owner.
First start on mine produced p0300 dtc's. I was very concerned. I started with wires and isolated which cylinder was not firing. I found there was spark at the wire. Next I swapped the plug with one from the old engine. At the same time I put injector cleaner in the tank. It gradually got better over the next several min of running. I only let it run for a few min at a time, but it was very rough.... Like it was running on 5 cylinders Eventually, it worked itself out and finally the MIL turned off on its own.
Perhaps your wires are nicked? Not fully seated? Plugs cracked or not tight? I hope this gives you a place to start.
-Chris
First start on mine produced p0300 dtc's. I was very concerned. I started with wires and isolated which cylinder was not firing. I found there was spark at the wire. Next I swapped the plug with one from the old engine. At the same time I put injector cleaner in the tank. It gradually got better over the next several min of running. I only let it run for a few min at a time, but it was very rough.... Like it was running on 5 cylinders
Eventually, it worked itself out and finally the MIL turned off on its own. Perhaps your wires are nicked? Not fully seated? Plugs cracked or not tight? I hope this gives you a place to start.
-Chris
I did purchace some new plugs and wires today to put in tonight or tomorrow. Ill keep you posted how it goes afterward...thanks again everyone
10-11-2014, 04:27 AM
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P3000-p3006 refer to engine misfire. MIL is the malfunction indicator light (check engine light)
I would start with replacing plugs and wires.
you mentioned that you rebuilt the motor yourself, does that include cam shaft installation?
I would start with replacing plugs and wires.
you mentioned that you rebuilt the motor yourself, does that include cam shaft installation?