Still Misfiring (P0306&P0300) after major service
#1
Still Misfiring (P0306&P0300) after major service
Greetings,
I worked on my 01 discovery with 101,000 miles and did the full list from Mike's, Major Service posting. It toke a few days and a few hundred dollars but got it complete with no problems Also, changed the crank sensor and both front 02's, since it came to a stop and would not start again (it fixed that problem!).
Before the service I was having a misfire and thought after I did the major service it would fix the problem. I did put on Magnacor 8mm plug wires ($112.00 later) and Bosch Platinum Plus 4's plugs. I made sure that all wires got on the coil right and got plug in all the way, I know this isn't the problem. I am still getting codes P0306 and P0300. misfire in #6 Is this a common problem? Could it be the coil pack? Is there a easy way to fine out whats going on? Any suggestions would be great. Thank you for all you guys that help each other out!
I worked on my 01 discovery with 101,000 miles and did the full list from Mike's, Major Service posting. It toke a few days and a few hundred dollars but got it complete with no problems Also, changed the crank sensor and both front 02's, since it came to a stop and would not start again (it fixed that problem!).
Before the service I was having a misfire and thought after I did the major service it would fix the problem. I did put on Magnacor 8mm plug wires ($112.00 later) and Bosch Platinum Plus 4's plugs. I made sure that all wires got on the coil right and got plug in all the way, I know this isn't the problem. I am still getting codes P0306 and P0300. misfire in #6 Is this a common problem? Could it be the coil pack? Is there a easy way to fine out whats going on? Any suggestions would be great. Thank you for all you guys that help each other out!
#2
#3
Greetings,
I worked on my 01 discovery with 101,000 miles and did the full list from Mike's, Major Service posting. It toke a few days and a few hundred dollars but got it complete with no problems Also, changed the crank sensor and both front 02's, since it came to a stop and would not start again (it fixed that problem!).
Before the service I was having a misfire and thought after I did the major service it would fix the problem. I did put on Magnacor 8mm plug wires ($112.00 later) and Bosch Platinum Plus 4's plugs. I made sure that all wires got on the coil right and got plug in all the way, I know this isn't the problem. I am still getting codes P0306 and P0300. misfire in #6 Is this a common problem? Could it be the coil pack? Is there a easy way to fine out whats going on? Any suggestions would be great. Thank you for all you guys that help each other out!
I worked on my 01 discovery with 101,000 miles and did the full list from Mike's, Major Service posting. It toke a few days and a few hundred dollars but got it complete with no problems Also, changed the crank sensor and both front 02's, since it came to a stop and would not start again (it fixed that problem!).
Before the service I was having a misfire and thought after I did the major service it would fix the problem. I did put on Magnacor 8mm plug wires ($112.00 later) and Bosch Platinum Plus 4's plugs. I made sure that all wires got on the coil right and got plug in all the way, I know this isn't the problem. I am still getting codes P0306 and P0300. misfire in #6 Is this a common problem? Could it be the coil pack? Is there a easy way to fine out whats going on? Any suggestions would be great. Thank you for all you guys that help each other out!
#5
#6
I had same codes after I changed the front O2's. Double check you have the O2 connectors pushed all the way in. It looked like I had them all the way in but they were not. I guess because of the tight area they are located. So I gave the connectors one more huge squeeze and I felt a click. Cleared codes and never came back runs perfect.
#7
Check your spark plug boots. If they have dry-looking or discolored spots, the plug wire broke inside the boot. This can happen during installation or removal if the boots are not pushed/pulled gently on/off the spark plug. The "wire" inside is really a delicate carbon-fiber material.
When that happens, the spark will arc through the boot into the engine block, cooking the plug boot in the process.
My Disco had a brand new set of plug wires on it when I bought it, but was mis-firing pretty badly. Couldn't figure it out for the longest time, it took a while for the plug boot show signs of damage.
New plug boots are about $2 each at NAPA, get the long orange ones. Carefully strip back the insulation, then crimp the new boot over the carbon fiber piece. There's not a lot of extra plug wire, so only trim back as little as possible to make sure it still fits with the new boot.
Good luck.
-Tim
When that happens, the spark will arc through the boot into the engine block, cooking the plug boot in the process.
My Disco had a brand new set of plug wires on it when I bought it, but was mis-firing pretty badly. Couldn't figure it out for the longest time, it took a while for the plug boot show signs of damage.
New plug boots are about $2 each at NAPA, get the long orange ones. Carefully strip back the insulation, then crimp the new boot over the carbon fiber piece. There's not a lot of extra plug wire, so only trim back as little as possible to make sure it still fits with the new boot.
Good luck.
-Tim
#8
Hey guys, I know its been awhile since I posted this. However, I wanted to let everyone I put on 2 new coil packs and the #6 misfire was fixed! I removed the upper intake manifold (to get to the coil packs easier) and when the manifold was off I put a new heat plat on, put 2 new gaskets on the rocker covers to fix a oil leak, torque the lower intake to make sure it was tight, oil change, and topped off everything. Wanted to give a update in case someone in the future reads this and has the same problem. It runs like new now!
Last edited by Scott Weiland; 10-16-2013 at 05:25 PM.
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