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Between 40-70 mph and accelerate the engine seems like it is missing or hesitate

(2004 Cadillac Escalade)
in Des Plaines, IL on November 20, 2013
between 40-70 mph and accelerate
Displaying 1 answers & 2 comments
Popular Answer
of Gillespie's Auto Service on November 20, 2013
Some transmission torque convertor clutch engagement, disengagement can feel very similar to a misfire. Do you have a check engine light on? Has anyone tried to pull codes from the system?

If this is a misfire the system should be logging misfire counts and that can be seen in the scan data. Plus a tech can override the TCC and pressure solenoid controls to prove if the problem is actually inside the transmission. Get this to a shop and let us know what they find.
on November 21, 2013
Thank you for getting back to me, I am not a wealthy man but I am a pretty good gear head, is overriding the TCC something I can do myself to see if this is the problem before I take it to a shop?
Please advise.

Thanks again for your help.
Attyboy
of Gillespie's Auto Service on November 21, 2013
Its possible to do if you have a scan tool capable of making the bi-directional commands to the computer. The TCC is normally duty cycle controlled, in otherwords its never turned all the way "on". That means you cannot just ground it for testing, that can cause damage. But if you command it to an 80-90% on command, and the symptom is abated, or even dissapears, then you have made a step on down the diagnostic routine. (The TCC is usually operated anywhere from 35% to 55%)
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