Toyota Camry Shakes Bad Running at Idle

1991 Toyota Camry Wagon 2.0 Liter
Multiple random codes.
question = 1991 Toyota Camry 4 cyl FWD Auto 80000 miles. I have a customer with a 1991 Camry wagon with a serious vibration. It only occurs when in reverse or drive and idling.

It violently shakes the steering column (and other interior trim) to the point where screws are falling out. We have, over the course of two years, replaced all five (Yes, five) motor/transmission mounts, cleaned the throttle body and fuel injectors, done a comprehensive tune up, replaced (due to other reasons) the idle air control valve, the throttle position sensor, and the mass air flow sensor. I cannot find any vacuum leaks, the EGR is working normally, and the compression is fine (and fairly equal across all four cylinders). The local Toyota dealer replaced the timing belt a while back, and I have verified that it's correct, but the vibration started long after the belt was installed, and the motor runs too well for the belt to be off. I don't know what to tell my customer. The dealer can!'t fix it either.

Answer: Something popped into my head even before I finished reading your question- a valve or valve seat problem. Maybe there is carbon on the valve faces and seats, or pitting, or just plain not seating. This would explain why it only happens at idle. You say a compression check looks OK, but this condition will not show up on a compression test. You need to do a cylinder leak down check. I'm guessing you will show at least one leaking cylinder. Either valves or piston rings.

Toyota Loud Noise In Motor

2001 Toyota Sequoia
Question = there was a loud noise toward front of motor then showed low oil pressure and died and wont start back up no compression either.

Answer: There are a couple of things that could have happened. The timing chain / belt may have broke. This would give you the no compression problem. A cam shaft could have broke or the cam or crank gear. The pin in the crankshaft could be broken. Sounds like you are going to have to start taking the front of the engine apart to look for what failed, and for what other parts could have been damaged.

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