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1966 Cadillac Coupe de Ville Coupe Base

1966 Cadillac Coupe de Ville Coupe
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June 30, 2011, 3:08 am

Iam Y

Question: Car shakes severly during idle and higher rpm, could this be a bad or damaged/worn torque converter?

Engine runs with no obvious signs of major damage, no bad leaks or obvious knocking or noises and doesn't smoke but car shakes badly when idling through higher rpm but stops shaking when put into gear, transmission works w/no leaks...I'm an amateur mechanic/hobbyist and was told that I could unbolt the torque converter and move it back slightly from the flywheel/flexplate so it will spin free and start the car as a test to see if the converter is bad...I can perform this myself, what do you recommend?...any ideas?...thanks

July 1, 2011, 10:34 pm

Richard W
Expert Mechanic

I don't think it's your torque converter. When you put it into gear it should get worse. I would check your tune up and fuel mixture.

1/1 users found this helpful.

July 6, 2011, 3:38 pm

Iam Y

...concerning the previous question...tune up and fuel mixture seem to be fine and nothing's changed before this problem suddenly started, it's seems to be a more serious problem than just fuel and tune up, I usually keep that in check, it's an everyday driver and I do my own maintenance...the engine seems to run well enough, but could the severe shaking come from a bad main bearing or other major or internal engine problem or what could be the possibilities that could cause the shaking and severe vibration?...just trying to keep from having to pull and overhaul the engine, it's well over a thousand dollars for a standard rebuild kit for this engine, plus parts and machine shop, and that's if I do it myself, it'd be a small fortune I can't afford to put it in a shop, I've checked...not asking for a free fix or to get out of working on it, just need some professional advice to steer me in the right direction to getting a general idea of what may be causing such a severe shaking problem without having to do a lot of work and spend a lot of money just to find out that I could have fixed it myself even with my limited knowledge and resources as the car is a classic and well worth the repair costs but not beyond my abilities to make reasonable repairs myself if it's nothing too major...if it were a major engine problem wouldn't there be obvious signs such as bad leaking, unusual noises, valve rattle, etc. or something related like excessive smoke, etc., as there's nothing obvious...could it be ignition system failure, worn or damaged timing gear/chain, jumped timing or mixed up spark plug wires, etc. cause the engine to shake severely like that, and I do mean SEVERE, bad enough it shakes the whole car like something's badly out of balance, this is the reason I asked about the torque converter or could it even be something broken in the transmission because the engine seems to run well enough to run on it's on...would it be possible to actually unbolt and disconnect the torque converter (there's just a pan and three bolts on the converter) just to test and see if it may actually be the problem as this seems to be the easiest and quickest way to find out without doing any major surgery or diagnoses or hire a professional mechanic to find out...when I put it into gear it stops shaking as bad but I haven't driven on the road to find out if it gets worse when speed increases, the transmission still pulls normally though, I'm confused but willing and able to work on the car, just need some clues...any ideas would be greatly appreciated...thanks.

0/0 users found this helpful.

July 6, 2011, 3:56 pm

Richard W
Expert Mechanic

When the car is idleing not in gear does it shake. If it does then your transmission and torque converter are out of the picture. I have never seen a torque converter couse a shake. I have seen it make noise but never a shake. So I would check you engine compersion. Make sure all cylinder are with in 10% of each other and more then 130psi. That will give you a base to start with. If compersion is ok then you start looking at other thing. After you have done the compersion test and all is good. Check your timing. Also just because you did a tune up lately does not mean that you don't have a problem with the parts you got. So double check you plugs.cap.rotor and wires.

1/1 users found this helpful.

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