V10 miss
Junior User
Joined: Jun 2004
Posts: 81
Likes: 0
Just an update to the miss I had in my '01 F250. I bought a new scan tool and found out the code generated (can't remember the #) was "#9 cylinder misfire." I put in a new coil and plug figuring I had the thing licked. Well.... Murphy's Law is alive an well with me!!! The dang thing was still missing badly! 
I did more troubleshooting and removed the #6 & #7 coil connections (one at a time) to see what kind of codes were produced and got "Coil F Failure" and "Coil G Failure." Since this wasn't the same code as generated by my original problem, I decided to look at the injectors. When I removed the electrical connection to the #9 injector, no codes were generated. This puzzled me since I figured the computer should have picked up the inoperable injector. Maybe I didn't let it run long enough to find it. Hmmmmmm???
Well anyway, I reconnected the injector and restarted it. Lo and behold, the miss was gone. Hallelujah!
So what was the problem?????? Since the connector did not appear loose when I first removed it and having a clogged injector that just happened to unclog at the same time I was remaking the electrical connection would be a bit far fetched, I'm thinking a poor (corroded) electrical connection to the injector. I cleaned the other injector connections to be safe and have been driving trouble free for days now.
A word of advice: Coils & plugs may be the most common problem for misses, but do yourself a favor an give the injectors a quick glance. It may save you some time and frustration later on down the road.
I did more troubleshooting and removed the #6 & #7 coil connections (one at a time) to see what kind of codes were produced and got "Coil F Failure" and "Coil G Failure." Since this wasn't the same code as generated by my original problem, I decided to look at the injectors. When I removed the electrical connection to the #9 injector, no codes were generated. This puzzled me since I figured the computer should have picked up the inoperable injector. Maybe I didn't let it run long enough to find it. Hmmmmmm???
Well anyway, I reconnected the injector and restarted it. Lo and behold, the miss was gone. Hallelujah!
So what was the problem?????? Since the connector did not appear loose when I first removed it and having a clogged injector that just happened to unclog at the same time I was remaking the electrical connection would be a bit far fetched, I'm thinking a poor (corroded) electrical connection to the injector. I cleaned the other injector connections to be safe and have been driving trouble free for days now.
A word of advice: Coils & plugs may be the most common problem for misses, but do yourself a favor an give the injectors a quick glance. It may save you some time and frustration later on down the road.
New User
Joined: Sep 2004
Posts: 10
Likes: 0
Guys. I have a 99 f250 v10. I have the #1 coil going south after about 5-10 miles; NEW ONES! So, I thought I might have a batch of bad aftermarket ones, but the Dealer sells the same ones the aftermarket guys do. Well, I put the new one on #2 cylinder (it works fine) and the #2 coil on #1 cylinder. It blew after 3 miles! I understand the the coils get full voltage and it is the PCM that grounds them and pulses them, but the grounding voltage using an ohm meter was the same as the others, but I did get a surge after I power braked the truck. Could that blow the coil? Any other ideas? HELP!
