jseabolt
Well-Known Member
- Joined
- July 12, 2009
- Messages
- 232
- Reaction score
- 5
- City, State
- Kingsport, Tennessee
- Year, Model & Trim Level
- 2006 Explorer Limted V8
This actually pertains to my Dad's 2002 F-150 4.6 liter but I've had the same thing happen on my 2006 Explorer.
On the Explorer I got it with about 120,000 miles. Apparently the owner did little maintenance on it. That's why I try to avoid vehicles with over 100,000 miles on them because it seems most people neglect maintenance on their vehicles.
So I changed what appeared to be the original spark plugs. I used Motorcraft plugs. Well not long after that, the engine started to misfire. Funny that the old plugs that looked awful did not misfire. Well turns out I got a defective spark plug right out of the box. I've never seen that happen before.
The bad thing is with these modular engines, it seems you have to drive them 300 miles misfiring before the misfire monitor will kick the check engine light on. With my Subaru if I fart too loud, will set the check engine light on.
Dad has had similar misfiring issues with his F-150. He took it to a guy he knows to have it repaired. I try to work on his stuff but I work shift work and sometimes he get's impatient or feels like I don't have the time to work on his vehicles.
I think the guy replaced all the spark plugs. I know he broke some of them off in the heads and had to buy a kit to fix them. Maybe I got lucky but I sprayed about 1/2" of PB blaster into the spark plug holes the day before I replaced mine and didn't break any off. Just because I've heard these modular engines are bad about this.
Dad said he thinks he replaced a bad coil at some point or another. In other words, I have no idea what parts have been replaced on his truck.
I drove the truck Friday and it was running rough. I hooked up my OBD II code reader and it said #7 cylinder misfire.
Since the truck is supposed to have all new plugs, I decided to see if it was the coil. So I bought a new one today, installed it but can't really tell if it fixed the problem because this truck bounces alot (maybe worn shocks) and feels like it needs the tires balanced. I know that sounds stupid but...
I told him to drive it for awhile and see if it runs any better.
Dad said he drove the truck to Wal-Mart and he thinks it's running better.
My question is how many of you guys have bought defective Motorcraft spark plugs for 4.6 liter engines?
Could the coil be the issue? Would a clogged or bad fuel injector set off the misfire monitor?
Fuel filter?
On the Explorer I got it with about 120,000 miles. Apparently the owner did little maintenance on it. That's why I try to avoid vehicles with over 100,000 miles on them because it seems most people neglect maintenance on their vehicles.
So I changed what appeared to be the original spark plugs. I used Motorcraft plugs. Well not long after that, the engine started to misfire. Funny that the old plugs that looked awful did not misfire. Well turns out I got a defective spark plug right out of the box. I've never seen that happen before.
The bad thing is with these modular engines, it seems you have to drive them 300 miles misfiring before the misfire monitor will kick the check engine light on. With my Subaru if I fart too loud, will set the check engine light on.
Dad has had similar misfiring issues with his F-150. He took it to a guy he knows to have it repaired. I try to work on his stuff but I work shift work and sometimes he get's impatient or feels like I don't have the time to work on his vehicles.
I think the guy replaced all the spark plugs. I know he broke some of them off in the heads and had to buy a kit to fix them. Maybe I got lucky but I sprayed about 1/2" of PB blaster into the spark plug holes the day before I replaced mine and didn't break any off. Just because I've heard these modular engines are bad about this.
Dad said he thinks he replaced a bad coil at some point or another. In other words, I have no idea what parts have been replaced on his truck.
I drove the truck Friday and it was running rough. I hooked up my OBD II code reader and it said #7 cylinder misfire.
Since the truck is supposed to have all new plugs, I decided to see if it was the coil. So I bought a new one today, installed it but can't really tell if it fixed the problem because this truck bounces alot (maybe worn shocks) and feels like it needs the tires balanced. I know that sounds stupid but...
I told him to drive it for awhile and see if it runs any better.
Dad said he drove the truck to Wal-Mart and he thinks it's running better.
My question is how many of you guys have bought defective Motorcraft spark plugs for 4.6 liter engines?
Could the coil be the issue? Would a clogged or bad fuel injector set off the misfire monitor?
Fuel filter?
