My '08 GT AWD has a distinct surge/thud noise when on a slight incline in 6th gear under acceleration. I have narrowed it down to the TQ lock up. It only does it in 6th gear in drive position? Once you move the gear selector to M the TQ unlocks and stays unlocked as designed. In M the surge/thud is not there. It feels like a trailer hitch issue or being hit from behind. There are several others on the forum with the same issue. I replaced the plugs to no avail. The car runs great except for this issue. Any ideas?
6th gear lock-up/unlock
- Thread starter Peryan
- Start date
This sounds like classic misfire... One of your ignition coils may be showing signs of failure. It took about 2 months of intermittent shuttering on my car before flashing check engine, then fault code P020x, where x = cylinder #. Relatively inexpensive to fix, don't wait to fix it.
Last edited:
MonsterEmma
Member
- :
- CX-9 AWD Touring
Yes this is a misfire, I went thorough all this with my CX-9 and swore it was a transmission issue. This forum saved me, I had no codes at all and saw where others had similar problems and it had been fixed with spark plugs and/or coils. I would recommend pulling the dynamic chamber and checking the coil resistance. You can check the coils (6) with an OHM meter, I bet you get at least one with an open circuit. I elected to replace all 6 coils at $80 a piece online. Put dielectric grease on the coils (at plug) at reassembly.
It sounds crazy but I haven't had this problem reoccur in over 10k miles.
It sounds crazy but I haven't had this problem reoccur in over 10k miles.
^^^ You mean the ford parts.... (lol2)
