Truck Died, po351-358 codes
07-29-2011, 09:01 AM
#1
Senior Member
Thread Starter
Truck Died, po351-358 codes
Hi Guys,
On my way into work this morning, my 06 with the 5.4 started running very rough/shaking at low rpms. I could kick it out of overdrive and it would smooth right out and seem to run fine at higher rpm.
I made it a few miles this way, until the truck just died completely. My edge shows codes po351, 352, 353........358. Ignition coil Primary/Secondary circuit fault on EVERY cylinder.
I find it hard to believe that every coil would fail simultaneously...computer?
Has anybody run into anything like this before? Any advice would be greatly appreciated!
On my way into work this morning, my 06 with the 5.4 started running very rough/shaking at low rpms. I could kick it out of overdrive and it would smooth right out and seem to run fine at higher rpm.
I made it a few miles this way, until the truck just died completely. My edge shows codes po351, 352, 353........358. Ignition coil Primary/Secondary circuit fault on EVERY cylinder.
I find it hard to believe that every coil would fail simultaneously...computer?
Has anybody run into anything like this before? Any advice would be greatly appreciated!
07-29-2011, 11:03 AM
#2
Senior Member
http://www.aa1car.com/library/copign.htm
"If a misfire is due to a bad coil, you should find a coil code that corresponds to the same cylinder (P0351 to P0358)."
"Individual ignition coils can be tested with an ohmmeter the same as those on a conventional distributor or DIS ignition system. Measure primary and secondary resistance and compared to specifications. If resistance is out of specifications, the coil is bad and needs to be replaced."
"If the crankshaft position sensor fails, the loss of the basic timing signal will prevent the system from generating a spark and the engine will not start or run. A failed driver circuit within the PCM can kill an individual coil and prevent that cylinder from firing. But with COP, an individual coil failure will only cause misfiring in one cylinder."
"If a misfire is due to a bad coil, you should find a coil code that corresponds to the same cylinder (P0351 to P0358)."
"Individual ignition coils can be tested with an ohmmeter the same as those on a conventional distributor or DIS ignition system. Measure primary and secondary resistance and compared to specifications. If resistance is out of specifications, the coil is bad and needs to be replaced."
"If the crankshaft position sensor fails, the loss of the basic timing signal will prevent the system from generating a spark and the engine will not start or run. A failed driver circuit within the PCM can kill an individual coil and prevent that cylinder from firing. But with COP, an individual coil failure will only cause misfiring in one cylinder."
07-29-2011, 12:15 PM
#3
Senior Member
Thread Starter
Thanks for the link, I will check a couple of coils since they seem to be a common problem on these trucks. It was running perfectly before this event though, so hard to believe they all went in such a short period of time.
The crank sensor makes some sense, being that it seemed to be "ok" at higher rpm for awhile, but maybe wasn't functioning properly at lower rpms?
Sounds like its not likely that the PCM would cause more than one cylinder to misfire? Did some searching and wasn't able to find any issues on PCM problems.
The crank sensor makes some sense, being that it seemed to be "ok" at higher rpm for awhile, but maybe wasn't functioning properly at lower rpms?
Sounds like its not likely that the PCM would cause more than one cylinder to misfire? Did some searching and wasn't able to find any issues on PCM problems.
07-29-2011, 10:23 PM
#4
Senior Member
Thread Starter
Quick update for the future reference of others.
Found the problem, turned out to be #5 coil wire rubbed through on the bracket that holds the power steering reservoir.
The 12v source to all of the coils was dead shorting intermittantly (causing the circuit codes to be thrown on all cylinders) until it finally blew the 15 amp fuse for the coils causing the truck to quit.
Fixed the wire, new fuse, and had to replace the coil that had the shorted wire because it got smoked.
All is well again.
The fuse also happens to control a shift solenoid, so if you get a short in a coil wire, it can throw shift solenoid/line pressure codes as well!
Found the problem, turned out to be #5 coil wire rubbed through on the bracket that holds the power steering reservoir.
The 12v source to all of the coils was dead shorting intermittantly (causing the circuit codes to be thrown on all cylinders) until it finally blew the 15 amp fuse for the coils causing the truck to quit.
Fixed the wire, new fuse, and had to replace the coil that had the shorted wire because it got smoked.
All is well again.
The fuse also happens to control a shift solenoid, so if you get a short in a coil wire, it can throw shift solenoid/line pressure codes as well!