bucking transmission
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Joined: Apr 2018
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bucking transmission
Hello Experts. I've been watching for a fix to my truck's bucking in and out of Overdrive, and I see posts about plugs, coils, fluid levels, filters, batteries, and more, but I don't see anything about FORD's comments, recalls, or service bulletins. If this problem is so pervasive, what's really causing it and what do I do to fix it once and for all time?
Lead Driver
Joined: Sep 2006
Posts: 7,907
Likes: 143
It requires the use of Scanner by someone who understands the operating system.
Not every problem is the same so needs diagnosis pointing to the possible cause.
Without, it's just guessing.
Now for a possibility, could be faulty coil. A coil with shorted turns may not set a code.
You have to get into the program and look into the memory that contains the record of the intermittent cylinder misfire counts.
This table has no ability to set code on intermittent conditions.
Another way is to set the Scanner up to trip when the misfire occurs and freeze frame the involved data.
Hope this sounds reasonable to You.
Good luck.
Not every problem is the same so needs diagnosis pointing to the possible cause.
Without, it's just guessing.
Now for a possibility, could be faulty coil. A coil with shorted turns may not set a code.
You have to get into the program and look into the memory that contains the record of the intermittent cylinder misfire counts.
This table has no ability to set code on intermittent conditions.
Another way is to set the Scanner up to trip when the misfire occurs and freeze frame the involved data.
Hope this sounds reasonable to You.
Good luck.
Hotshot
Joined: Oct 2007
Posts: 18,827
Likes: 92
From: Manhattan Kansas
I was having the bucking issue, convinced I had a bad transmission, and ended up finding that I had two bad spark plugs which caused two bad coils. Once that problem was fixed, my bucking went away for quite a while. Later on it returned, and so I ordered a scanning tool from Amazon that bluetoothed to my phone, and gave me real time info, and cylinder misfires. I was able to pinpoint which cylinder was causing the issue, and found it was another coil going bad. Previous owner had put in parts store brand coils. This may not be your issue, but this is what I found. Also had the same issue with my daughter's Merc Sable, and used the scanner on it to find a bad coil on it as well.
Lead Driver
Joined: Sep 2006
Posts: 7,907
Likes: 143
baitmaster don't be surprised if the misfire comes back because the plugs only improved just enough to cover a faulty coil.
After the plugs get about 2000 miles they require more spark voltage.
If the faulty coil can't produce, your back into misfire again.
It's a marginal issue your involved in.
What is happening is the faulty coil is not a hard failure but has 'shorted' turns causing lower voltage output.
This kind of fault does not set a code because it's not a hard fault.
There is an involved explained cause and effect on all this but won't go into that now.
.
Good luck.
After the plugs get about 2000 miles they require more spark voltage.
If the faulty coil can't produce, your back into misfire again.
It's a marginal issue your involved in.
What is happening is the faulty coil is not a hard failure but has 'shorted' turns causing lower voltage output.
This kind of fault does not set a code because it's not a hard fault.
There is an involved explained cause and effect on all this but won't go into that now.
.
Good luck.
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