5 different fault codes
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Mountain Pass
Joined: Jul 2005
Posts: 177
Likes: 1
5 different fault codes
The check engine light came on in my truck and while I suspected it was a misfire (driving along it will misfire like crazy at certain RPM). What I cannot figure out is exactly which coil is causing the problem. I get these codes:
P0306 - Cylinder 6 misfire --> Easy enough, cylinder 6
P0356 - Ignition Coil F Primary/Secondary Circuit --> Which cylinder is this?
P0356 - Ignition Coil G Primary/Secondary Circuit --> Which cylinder is this?
Assuming that cylinder 1 is the front left (when facing the vehicle) am I right in that cylinder 6 is the 2nd from front on the right (when facing the vehicle)? Would Ignition Coil F also be on cylinder 6? and therefore ignition coil G be cylinder 7?
The other code I am getting are both the same:
P1740 - Powertrain
P1740 - Powertrain - Transmission System Problems
I suspect these 2 are related to one another, the odd piece is it drives fine other than the misfire. Hoping to cure the misfire so that it drives smoothly and I can then figure out the P1740 code.
Thanks.
P0306 - Cylinder 6 misfire --> Easy enough, cylinder 6
P0356 - Ignition Coil F Primary/Secondary Circuit --> Which cylinder is this?
P0356 - Ignition Coil G Primary/Secondary Circuit --> Which cylinder is this?
Assuming that cylinder 1 is the front left (when facing the vehicle) am I right in that cylinder 6 is the 2nd from front on the right (when facing the vehicle)? Would Ignition Coil F also be on cylinder 6? and therefore ignition coil G be cylinder 7?
The other code I am getting are both the same:
P1740 - Powertrain
P1740 - Powertrain - Transmission System Problems
I suspect these 2 are related to one another, the odd piece is it drives fine other than the misfire. Hoping to cure the misfire so that it drives smoothly and I can then figure out the P1740 code.
Thanks.
Hotshot
Joined: Jul 2005
Posts: 11,931
Likes: 180
yes, #6 will be the second cylinder back from the front, on the drivers side. Your codes say something is wrong with #6 COP, or the wire attachment to it. I would remove the #6 COP, inspect the wire, etc.. replace COP... clear codes ... retest and see how many codes go away.
Lead Driver
Joined: Sep 2006
Posts: 7,907
Likes: 143
Code 1740 is a torque converter clutch solenoid fault.
.
Cylinder codes 30x is the plug or secondary side of a cylinder ignition failure
and is rotation time detected.
.
Cylinder code 35x is the primary side electrical detection issue.
.
The detection for these two codes is completely different for each one as noted.
.
Cylinder count begins on passenger side front as #1 to #4 rear then #5 front to #8 rear on the driver side.
You only have 3 fault codes as listed. 306, 356 same cylinder and 1740 a trans code.
Actually only 2 faults overall.
Good luck.
.
Cylinder codes 30x is the plug or secondary side of a cylinder ignition failure
and is rotation time detected.
.
Cylinder code 35x is the primary side electrical detection issue.
.
The detection for these two codes is completely different for each one as noted.
.
Cylinder count begins on passenger side front as #1 to #4 rear then #5 front to #8 rear on the driver side.
You only have 3 fault codes as listed. 306, 356 same cylinder and 1740 a trans code.
Actually only 2 faults overall.
Good luck.
Posting Guru
Joined: Jun 2009
Posts: 1,908
Likes: 20
From: Fort Smith, Arkansas
# 6 is the first plug on bank 2 on my V10s.
It is always important to list which engine and which vehicle is being referenced.
My 7700 is getting a V10
Also, all vehicle directions such as front, back, right, & left are referenced as if you were sitting in the driver seat.
# 1 cylinder on a Ford is front right.
It is always important to list which engine and which vehicle is being referenced.
My 7700 is getting a V10
Also, all vehicle directions such as front, back, right, & left are referenced as if you were sitting in the driver seat.
# 1 cylinder on a Ford is front right.
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Mountain Pass
Joined: Jul 2005
Posts: 177
Likes: 1
Bumping this back up.... so I swapped out the problem coil pack (in fact swapped out all 8 of them) and the misfire went away. Not yet done anything with the P1740 code, but it is from what I can tell fairly straight forward.
Now, I rarely drive the truck, on average it does 10 miles every couple of weeks (driven to the dump and back) but since replacing the coil I drove it a little more than usual, just to be certain the problem was gone. However, over the weekend I took a trip and noticed it misfiring again. Scanned and this time it is reading on coil 3, just a single P0306 code.
In the past this truck routinely seems to get misfires, it seems to be fine the majority of the time, then gets a misfire out of nowhere. I have noticed it worse after it has rained or the weather is cold, for example right now the temperatures have been at or below freezing, the truck is parked outside, so is moisture somehow affecting the coils?
Thanks.
Now, I rarely drive the truck, on average it does 10 miles every couple of weeks (driven to the dump and back) but since replacing the coil I drove it a little more than usual, just to be certain the problem was gone. However, over the weekend I took a trip and noticed it misfiring again. Scanned and this time it is reading on coil 3, just a single P0306 code.
In the past this truck routinely seems to get misfires, it seems to be fine the majority of the time, then gets a misfire out of nowhere. I have noticed it worse after it has rained or the weather is cold, for example right now the temperatures have been at or below freezing, the truck is parked outside, so is moisture somehow affecting the coils?
Thanks.
Posting Guru
Joined: Jun 2009
Posts: 1,908
Likes: 20
From: Fort Smith, Arkansas
P0306 means that it is misfiring on cylinder #6.
And yes, moisture can seep past the coil boot and cause misfires. This is why you want to always use compressed air to blow out the spark plug well when chasing a misfire.
And yes, moisture can seep past the coil boot and cause misfires. This is why you want to always use compressed air to blow out the spark plug well when chasing a misfire.
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Mountain Pass
Joined: Jul 2005
Posts: 177
Likes: 1
So if moisture can seep past the coil boot causing the misfire, what is the long term solution for it? Or is there nothing that can really be done?
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Tuned
Joined: Apr 2013
Posts: 354
Likes: 5
From: Katy, Republic of Texas
PO303 would be Cylinder #3.
What brand COP did you get? Cheap e-bay/Amazon coils are known to go bad quickly (sometimes even out of the box).
Did you keep the OEM COP you took off? If so, put one of those on (hopefully you marked the bad #6 and possible #7 COP). If you did not keep them, you can swap say the #2 and #3 and see if the code follows the COP. If so, it is bad and needs to be replaced.
Did you change the spark plugs when you did the COP?
What brand COP did you get? Cheap e-bay/Amazon coils are known to go bad quickly (sometimes even out of the box).
Did you keep the OEM COP you took off? If so, put one of those on (hopefully you marked the bad #6 and possible #7 COP). If you did not keep them, you can swap say the #2 and #3 and see if the code follows the COP. If so, it is bad and needs to be replaced.
Did you change the spark plugs when you did the COP?
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Mountain Pass
Joined: Jul 2005
Posts: 177
Likes: 1
What brand COP did you get? Cheap e-bay/Amazon coils are known to go bad quickly (sometimes even out of the box).
Did you keep the OEM COP you took off? If so, put one of those on (hopefully you marked the bad #6 and possible #7 COP). If you did not keep them, you can swap say the #2 and #3 and see if the code follows the COP. If so, it is bad and needs to be replaced.
Did you keep the OEM COP you took off? If so, put one of those on (hopefully you marked the bad #6 and possible #7 COP). If you did not keep them, you can swap say the #2 and #3 and see if the code follows the COP. If so, it is bad and needs to be replaced.
Nope, and about an hour after finishing swapping the COP's, I did something along these lines
and said to myself why did I not save the headache of having to do this twice and swap plugs at the same time.Hopefully I have one of the old COP's still, with it being cylinder 3 at least it is not too difficult to get at and I can swap it.
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