Toyota Repair: 1996 Toyota Camry LE, toyota camry, inner fender

Question
We have a 1996 Toyota Camry LE purchased from my mother for my 16 year old daughter. I had a mechanic look over the car to see that that there was nothing seriously wrong with the car. It has 117,000 actual miles; has had all scheduled maintenance as recommended. There was vibration in the motor when the car was in drive or reverse and we anticipated that it could be a motor mount.  The mechanic indicated nothing physically that he could see related to the motor mounts.  We had new brakes, oil leak repaired and a timing belt and were told the car was in very good shape.  He anticipated the vibration could be a fuel injector since it was NOT vibrating in neutral or park, only in drive at a stop light and ceased when the car accelerated.  He added fuel injector cleaner and we are now on our second tank of gas and although this vibration is MUCH better, it’s still evident.  I noticed yesterday that as the car was driven longer and the engine heats up the vibration was more noticeable.  The car drives great and there is no hesitation or stalling… any suggestions before we take it back & spend additional $$ on pinpointing the problem?

Answer
A vibration that can be felt inside the car and in the steering while while the transmission is in gear is usually due to a collapsed motor mount or contact between the engine metal parts and the body, the most common cause is the motor mount in the front near the radiator, there is a link type mount on the front of the engine that connects to the inner fender which can crack the insulation so it should be checked for that as well.