ATX guys with an engine rattle that can't be found...

[SeanMc]

It is more than likely your flexplate. I had the nuts on mine back off a little bit and it was causing a vibration/rattle that I couldn't pin-point until I had it up on a lift. With Brian aka GoofSHO's help, he re-locktited all the nuts. This was done by removing the starter, and then spinning the trans with a screwdriver.

In the past week, I noticed the car losing power, getting crappy mileage, and the code I would get was for the knock sensor. Turns out it was hearing the rattling, thought it was a ping, and backed off timing significantly. Now that it's all fixed up, the car purrs like a kitten.

Anyway, just a heads up!

 

[Ishodu]

Sweet, glad to hear you didn't have to pull the tranny to get it fixed.

 

[SHOtimer]

Those nuts are self-locking one time use.... Maybe whoever installed them reused them instead of replacing them, which in turn caused them to back off.

Doug