Driving to work Friday, after about 28 miles of normal cruise, I was coming out of a 45 zone, car was in third gear. I increase speed to 55, and just as the trans shifted into OD the car started to shudder as if it had a spark miss. Running pretty ragged for the next mile to work, and the check engine light came in. As I stopped I could hear what seemed to be valve tapping similar to what you would hear with low oil level (oil level and pressure were fine). Checked all the spark plug wires, no arc. Noticed that my wide band was showing a little lean (around 16), so tried adjusting the AFR with the PMS. I could tell a difference but the problem was not corrected. Pulled the codes and got a 65, bad act sensor. Replaced the ACT sensor today, no difference. The code 65 also returned.
I don’t know if the tapping started at the same moment that the car started to run rough. And although it started the moment the tranny shifted to OD, the condition is present in all gears and at idle. Don’t know if this means anything, but the tapping seems to be from the right side at the front of the valve cover which happens to be near the ACT sensor. Is there possibly something wrong with the #5 valves/rockers causing heat build up in the #5 runner (ACT location)? What the heck is going on?? Little help please!!
I don’t know if the tapping started at the same moment that the car started to run rough. And although it started the moment the tranny shifted to OD, the condition is present in all gears and at idle. Don’t know if this means anything, but the tapping seems to be from the right side at the front of the valve cover which happens to be near the ACT sensor. Is there possibly something wrong with the #5 valves/rockers causing heat build up in the #5 runner (ACT location)? What the heck is going on?? Little help please!!
Good luck getting it fixed and the car back on the road 
