Need some help fellas, misfire at startup
#1
Need some help fellas, misfire at startup
2002 F150 4.6
254K miles
At startup, I have a rough idle until the truck warms up, and then it runs fine.
I had checked the codes - number 302 and 316 came up.
I replaced the COP for that cylinder, but it's still doing it. I also aired out the cylinder well and into the plug hold, thinking there may be moisture in it.
What's my next step? gotta get the codes cleared so i can pass an inspection test (in Louisiana).
thanks as always
C
254K miles
At startup, I have a rough idle until the truck warms up, and then it runs fine.
I had checked the codes - number 302 and 316 came up.
I replaced the COP for that cylinder, but it's still doing it. I also aired out the cylinder well and into the plug hold, thinking there may be moisture in it.
What's my next step? gotta get the codes cleared so i can pass an inspection test (in Louisiana).
thanks as always
C
#3
#6
#7
Pull the cop, stick a screwdriver or something in it, start the engine and make sure you have spark. If you do, then it's either a bad spark plug, injector issue, or a component of that cylinder is worn and doesn't make adequate compression until its warm.
If you don't have spark, it could be a bad coil, wiring issue, or coil driver in the PCM.
If you don't have spark, it could be a bad coil, wiring issue, or coil driver in the PCM.
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#8
#10
#11
The only way you will break any plugs for that engine is if you try to. it's the 2004-early 2008 5.4s that have the breakage issue. You just have to torque your plugs tight to keep them from spitting out. You should change the plugs as quickly as possible, you are stressing the COPs.
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Jim
Jim
#13
I'm having the same problem except it has all new plugs coils and injectors with less than 500 miles. Getting 301 and 302 codes that's the reason for the new parts in the first place, this set of plugs and coils had reached about 85k miles so I figured it was about time and did the injectors just to be on the safe side. I'm not really sure were to look next.
#14
Same thing I said in post #7
Pull the cop, stick a screwdriver or something in it, start the engine and make sure you have spark. If you do, then it's either a bad spark plug, injector issue, or a component of that cylinder is worn and doesn't make adequate compression until its warm.
If you don't have spark, it could be a bad coil, wiring issue, or coil driver in the PCM.
Pull the cop, stick a screwdriver or something in it, start the engine and make sure you have spark. If you do, then it's either a bad spark plug, injector issue, or a component of that cylinder is worn and doesn't make adequate compression until its warm.
If you don't have spark, it could be a bad coil, wiring issue, or coil driver in the PCM.