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Truck Jerking/Studdering Around 45-50 mph

 
  #241  
Old 11-18-2018, 09:26 AM
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Originally Posted by Give me a break auto View Post
Is there a permanent fix for this problem yet
I have the same issue with my 97 4.2 truck, turns out it was the lower intake gasket going on cylinder 4 had a break on the seal. I replaced everything before I came across the lower intake. I was just about to give up on this but notice when I was checking the oil level I noticed it was gray and the oil cap had white stuff on it. So I thought I have a blown head gasket. After researching more about this I came across the lower intake. I replaced it and it's all fixed now. Now if I can only find where I have a vac leak I should be good. As it doesn't seem to idle right in park.
 
  #242  
Old 12-31-2018, 07:52 PM
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Been chasing this studdering thing for a while on my 2206 Expy 5.4 3 valve. Never a code.

Got a different app for my android (ODB2 Doctor), paid the $4.99 for 1 month and ran it down the road. Wait for the TC to lock and get around 50 with light load and get the bucking. Look at "Diagnostic" portion of the app and see a ton (83 in 5 minutes) misfire on Cylinder #1. Go to Ford, pick up qty 1 of 3L3Z-12029-BA. Install and problem fixed!

Thanks Bluegrass!
 
  #243  
Old 12-31-2018, 08:02 PM
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Originally Posted by cbrown9064 View Post
Been chasing this studdering thing for a while on my 2206 Expy 5.4 3 valve. Never a code.

Got a different app for my android (ODB2 Doctor), paid the $4.99 for 1 month and ran it down the road. Wait for the TC to lock and get around 50 with light load and get the bucking. Look at "Diagnostic" portion of the app and see a ton (83 in 5 minutes) misfire on Cylinder #1. Go to Ford, pick up qty 1 of 3L3Z-12029-BA. Install and problem fixed!

Thanks Bluegrass!
Torque Pro will do the same and costs $5 once with no expiration.

 
  #244  
Old 12-31-2018, 08:52 PM
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Originally Posted by Sam I Am View Post
Torque Pro will do the same and costs $5 once with no expiration.
I have Torque Pro and could not get the same data
Perhaps I dont know how to use it.
 
  #245  
Old 12-31-2018, 09:19 PM
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To polish this off, the conditions that bring about the misfire require max coil voltage/spark.
If a coil cannot deliver during that part of the drive cycle, a misfire occurs you feel as a jerking.
When a down shift or up shift occurs, those conditions no longer exist, the misfire is cancelled and there is no code.
Only way is to Trap it or look in the history record for each cylinder at the past totals. You don't even have to drive the vehicle to see it in the record but good to verify the fault has been corrected.
Note that if memory is cleared, the history is also lost and would need to be rebuilt over a number of drive cycles if the fault is still present.
This can even somewhat predict future failures of boots etc if the same cylinder/s keep registering low amount of misfires that don't go out of limits.
No engine is always completely free of misfires all of the time due to the wide operating conditions.
Good luck.
 
  #246  
Old 12-31-2018, 09:23 PM
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Originally Posted by cbrown9064 View Post
I have Torque Pro and could not get the same data
Perhaps I dont know how to use it.
Put it on "test results" and drive it.
Misfires counts will show up per cylinder
looks like this


Torque Pro misfire counts. The last 2 digits are cylinder #. Note that the green box showing misfires on cylinder 1 in my sample pic is checked "OK" because the misfire was intermittent and did not set a hard code, therefore no check engine light. If it is a red box, it is ongoing and more "immediately serious".

True that driving it is not required, but is often the easiest and most thorough way to reproduce an intermittent misfire that only occurs on "that one hill" or on "that certain stretch of road".
 
  #247  
Old 01-01-2019, 07:19 PM
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Originally Posted by Bluegrass 7 View Post
To polish this off, the conditions that bring about the misfire require max coil voltage/spark.
If a coil cannot deliver during that part of the drive cycle, a misfire occurs you feel as a jerking.
When a down shift or up shift occurs, those conditions no longer exist, the misfire is cancelled and there is no code.
Only way is to Trap it or look in the history record for each cylinder at the past totals. You don't even have to drive the vehicle to see it in the record but good to verify the fault has been corrected.
Note that if memory is cleared, the history is also lost and would need to be rebuilt over a number of drive cycles if the fault is still present.
This can even somewhat predict future failures of boots etc if the same cylinder/s keep registering low amount of misfires that don't go out of limits.
No engine is always completely free of misfires all of the time due to the wide operating conditions.
Good luck.
Yep, this makes perfect sense. I tune the Cobra with a Quarterhorse and Binary Editor, and am well aware how that strategy works (EECV) But this truck was foreign to me. Now that I know what was going on (TC lock, EGR, timing) it does make sense with a weak coil.

As a side note when I was looking for the issue, I watched the PCM pull spark (or more accurately watched the timing retard) during this misfire. That to me confirmed Bluegrass's diagnosis. I just needed to pin down which cylinder. The ODB2 Doctor is definitely friendlier for some things than Torque Pro, but each good on their own.

Many thanks guys! I also found 2 dry rotted vacuum lines during this work, so it runs pretty good now! Only 141k miles, but many more to go!
 
 
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