Engine Miss/Ignition Coils/New computer required?
12-11-2018, 09:51 AM
#1
Shazzam!
Thread Starter
Engine Miss/Ignition Coils/New computer required?
So I had a kerfuffle and a bunch of codes...ignition coils, CHT sensor. So, I got a new set (2nd time since I've owned the truck I've put some on) and put them all on. Also managed to get the CHT sensor on (man, what a chore...) Cleared codes, restarted, etc...still a fault code on 7 (P0357). Switched the coil, code did not follow, so it's in cylinder 7 and not the coil. Put a new connector on 7 and still the code and miss. SOOOOO the mechanic (from my work, he moonlights for side work) and I did some checking on the wires. Voltage on one wire, no voltage or ground on the other. No signal from the ECM. Also did a continuity test on the pink/blue wire, and ECM to ignition coil was good.
So, I *think* I need a new ECM, and then need it programmed. Is that the most likely problem? If I do need to buy an ECM, is there anything I should know ahead of time? Tips/tricks? Any help is appreciated...right now I'm carpooling with my wife so my truck is just parked outside of my house.
2004 F150, 5.4L, about 220k miles.
So, I *think* I need a new ECM, and then need it programmed. Is that the most likely problem? If I do need to buy an ECM, is there anything I should know ahead of time? Tips/tricks? Any help is appreciated...right now I'm carpooling with my wife so my truck is just parked outside of my house.
2004 F150, 5.4L, about 220k miles.
Last edited by jljde; 12-11-2018 at 09:58 AM.
12-11-2018, 10:44 AM
#2
Senior Member
FWIW... Try changing the plug yet? Possible it was cracked before/upon installation and now causing grief.
I don’t know if ground on coils go through ECM or not, so I can’t help you there.
I don’t know if ground on coils go through ECM or not, so I can’t help you there.
12-11-2018, 11:11 AM
#4
05 5.4l 3v s.crew lariat
You don't say if cops OEM
Cleaning contacts of oem coils is a must do . New plugs are the sp546 mc . Yes the PCM flashes the ground on cops, an overload can burn driver out on pcm . Make sure wire is inspected to ground so pcm can control same .
I don't have any luck with non oem cops . A set pf non are $60 ,one oem can run $50 so does that tell you anything about quality . Yes clean the carbon out of the head that breaks plugs going in and out in the tip area (use carb cleaner), no additive is going to get that tough carbon out of there. Clean cop and spring .Easy on that dielectric grease it is an insulator.
Your cop have standing 12vdc on cop when key on, check for that it jumpers around . Then you have the injectors maybe swap those too. I believe in changing injectors after 100k they can leak and hydro lock engine ,then shes toast . Injectors are controlled the same way .
P0357 =Ignition Coil G Primary/Secondary Circuit Malfunction=no 7 Drivers side third one in from radiator
I don't have any luck with non oem cops . A set pf non are $60 ,one oem can run $50 so does that tell you anything about quality . Yes clean the carbon out of the head that breaks plugs going in and out in the tip area (use carb cleaner), no additive is going to get that tough carbon out of there. Clean cop and spring .Easy on that dielectric grease it is an insulator.
Your cop have standing 12vdc on cop when key on, check for that it jumpers around . Then you have the injectors maybe swap those too. I believe in changing injectors after 100k they can leak and hydro lock engine ,then shes toast . Injectors are controlled the same way .
P0357 =Ignition Coil G Primary/Secondary Circuit Malfunction=no 7 Drivers side third one in from radiator
12-11-2018, 11:12 AM
#5
Shazzam!
Thread Starter
After the electrical and continuity test(s), that's what the mechanic seemed to think was plausible or at least most likely. I just don't know anything to look out for when buying an ECM. Looks like it's just unbolt old, unplug wire bundles, bolt on new one, plug back in, then program. I think at least. Any help is appreciated.
12-11-2018, 11:15 AM
#6
Shazzam!
Thread Starter
Cleaning contacts of oem coils is a must do . New plugs are the sp546 mc . Yes the PCM flashes the ground on cops, an overload can burn driver out on pcm . Make sure wire is inspected to ground so pcm can control same .
I don't have any luck with non oem cops . A set pf non are $60 ,one oem can run $50 so does that tell you anything about quality . Yes clean the carbon out of the head that breaks plugs going in and out in the tip area (use carb cleaner), no additive is going to get that tough carbon out of there. Clean cop and spring .Easy on that dielectric grease it is an insulator.
Your cop have standing 12vdc on cop when key on, check for that it jumpers around . Then you have the injectors maybe swap those too. I believe in changing injectors after 100k they can leak and hydro lock engine ,then shes toast . Injectors are controlled the same way .
P0357 =Ignition Coil G Primary/Secondary Circuit Malfunction=no 7 Drivers side third one in from radiator
I don't have any luck with non oem cops . A set pf non are $60 ,one oem can run $50 so does that tell you anything about quality . Yes clean the carbon out of the head that breaks plugs going in and out in the tip area (use carb cleaner), no additive is going to get that tough carbon out of there. Clean cop and spring .Easy on that dielectric grease it is an insulator.
Your cop have standing 12vdc on cop when key on, check for that it jumpers around . Then you have the injectors maybe swap those too. I believe in changing injectors after 100k they can leak and hydro lock engine ,then shes toast . Injectors are controlled the same way .
P0357 =Ignition Coil G Primary/Secondary Circuit Malfunction=no 7 Drivers side third one in from radiator
