My 93 Lexus ES 300 has miss while idling.

At first sign of ANY overheating, you never use the car
again, until properly resolved

To continue to drive it & add water ,can't tell you what
my feelings are about that non sense

Obviously where ever you went for help, failed to find much
& now you start over at a more competent shop

your idling must very low thats why your car shakes..check the rpm gauge and refer to your vehicles manual on proper rpm when idle..bring to the mechanic to adjust the idling rpm

i have a brand new battery in a 1993 lexus es 300 the horn blows but lights will not come on neither will it start ive tried twisting the wires and taping the starter still will not start.

if it has cables for your shifter xheck them they break.im assuming its an standard

you might want to look into a new clutch or your release bearing for you clutch is wearing out

check the basic, from fuse and relay engine cooling . have the fan check making sure the fans motor is good, does the fans come on at all when the engine has been running for while, if not it can be the switch, i would go ahead and replace them both thermostats and thermostats switch if you haven't done it. Thermostat switch has to be good, which it turn on and off the cooling fan. Thermostat (work like a valve) has to also operate properly other wise the fluid will continue to flow hot or not flow at all. thermostats will cost 7-8 bucks and the switch cost 47-50 bucks.

i have the same problem its the timing belt hydraulic actuator on mine hope this helps.

try pullingthe vac. line ofthe fuel regulator plug the hose then try it if it runs ok then replace the fuel regulator.

The only way to check why the check engine light is on is to have autozone or a mechanic put a scanner on the car and read the engine codes. This will tell you exactly what is wrong. Many part stores will test it for free. Mechanics will charge about $40 But you will definately know exactly what the problem is.

If gauge is fine and car smells hot. It is probably due to plugged exhaust unless you have a wire laying on the exhaust manifold and it's melting.

Sorry for the delay.
I am personally going back to answer your unanswered question. I do not know if you still need the answer, but I am going to answer it in case you still do.

Click on the following direct Link. It has the Timing Belt/MARK(S) Diagrams that you will need, complete with Instructional and Directional Diagrams.

Again my apologies...
Let me know if this helped, or if you have additional information or questions. Feel Free to contact me at FixYa.com!
http://www.2carpros.com/car_repair_information/year/1993/make/lexus/model/es_300/1993_lexus_es_300_timing_belt_diagram_marks.htm