dovechub

I have a 2004 Lexus ES330 with 148K miles. In the morning on my way to work, when coming to a stop my car will violently jerk when I am slowing down. It does it between 20 and 0 mph. There are no lights that come on. I then press the gas and it will jerk again and then kick into gear and continue on. The first jerk is very hard though and it is scarey. Feels like someone slammed into the back of me. Does anyone know what this could be?

DRACO A5OG

Check the three motor mounts ( especially the lower rear round mount ) and the trans mount.

dovechub

Okay, thank you so much. Going to have them do that today!

ES300NZ

engine mounts. probably the rear one. definately broken.

Oro

Two other things:

1) There is an upper mount, too. It is called a "torque strut" aka dogbone mount, running from the front of the engine to the adjacent shock tower. It is usually the first to break. Aftermarket prices are substantially cheaper than dealer prices on this piece.

2) Change your ATF fluid if it has not been done on schedule. It will smooth the shifting, too.

http://www.toyotanation.com/forum/10...lush-pics.html

dovechub

Thank you all so much! I saw pictures of engines with broken mounts and it looks just like what my car is doing. I want to get it fixed before I get whiplash.

dovechub

Ok, finally got it hooked up and it came up with a code finally, or a pending code, P0741 Torque Converter Clutch Solenoid

DRACO A5OG

Oh damn. It appears to be under the pan. Well you can also discover it there are any buts and pieces while you are in there.

dovechub

This violent jerking started happening after I had alternator replaced. Could it be releated at all?

ES300NZ

Typically I would say no. Because those two systems are in no way related.

<insert paranoia>
But, every so often I run into a situation where a mechanic has damaged a car in such a way so that some time later it will need a repair and the customer will come back. So, my suggestion is that you take the car to another repair place if possible. Unless you are 100% sure that didn't happen, or have no other option.
</insert paranoia>

... by every so often .. I mean about once every 5-6 years.

speedkar9

If you define "violent" shifting as a tad harsher than normal, disconnecting the battery during the alternator replacement would have reset the ECU causing idle to be high and shift points to be changed until it relearns your driving style.

Does the engine rock back and forth when going from R to D? If so its the engine mounts, although 148K is little young for the mounts to go that bad.