Misses When Cold - Help
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Tuned
Joined: Aug 2004
Posts: 269
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Misses When Cold - Help
1996 F350 5.8 e4od.
the last couple of times i have started the truck it misses as i drive down the road - bucks a bit and not firing on all cylinders. about 5 minutes into the drive the truck is up to operating temp and runs perfect all day long. if you let it sit for a few hours and it fully cools down, it will miss again upon starting it up, and then after 5 or so minutes its running great again.
i thought maybe it was moisture in my rotor and cap that was causing the miss, then the moisture burns off and it runs fine. i was due for a rotor and cap, so i replaced them, but the cold miss is still there. spark plugs are only about a year old.
and fyi - it does it on both tanks, so not a dying fuel pump, and pump in front tank was replaced a year ago along with fuel filter that sits along the frame rail. plus the fact that it goes away when truck is warm makes me think its not a fuel issue.
any thoughts on what it could be? plug wires? coil? i'd rather not just throw parts at it.
the last couple of times i have started the truck it misses as i drive down the road - bucks a bit and not firing on all cylinders. about 5 minutes into the drive the truck is up to operating temp and runs perfect all day long. if you let it sit for a few hours and it fully cools down, it will miss again upon starting it up, and then after 5 or so minutes its running great again.
i thought maybe it was moisture in my rotor and cap that was causing the miss, then the moisture burns off and it runs fine. i was due for a rotor and cap, so i replaced them, but the cold miss is still there. spark plugs are only about a year old.
and fyi - it does it on both tanks, so not a dying fuel pump, and pump in front tank was replaced a year ago along with fuel filter that sits along the frame rail. plus the fact that it goes away when truck is warm makes me think its not a fuel issue.
any thoughts on what it could be? plug wires? coil? i'd rather not just throw parts at it.
Thread Starter
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Tuned
Joined: Aug 2004
Posts: 269
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well anyway i threw a new coil in it as it still had the original one. i hate throwing parts at a problem without proper diagnosis, but with 2 feet of snow coming tomorrow i was desperate to get this plow truck running properly.
the new coil solved the problem. i don't know why a coil would cause a miss when cold, and then work just fine when warm. i've seen the opposite happen when a coil gets heat soaked.
maybe this thread can help someone in the future who has this strange issue happen to them.
the new coil solved the problem. i don't know why a coil would cause a miss when cold, and then work just fine when warm. i've seen the opposite happen when a coil gets heat soaked.
maybe this thread can help someone in the future who has this strange issue happen to them.
Freshman User
Joined: Jul 2014
Posts: 49
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From: British Columbia
i have had the same issue with my 5.0L then i did the same and it solved the problem so far lol... and in my training i was taught to think of an ignition coil as a very large Relay just because they both where out in pretty much the same ways.
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