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LS400

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Question
I have replaced radiator watepump ect still running hot
If you did not replace the thermostat then you should replace it and then refill the system after bleeding out all the air in the system. Check to make sure the fans come on when the temperature goes up. If...
Question
Will bad brake calipers cause excessive vibrating in steering wheel while driving?
This may very well be caused by the uneven wear on the front tires. When uneven tread is subjected to various road conditions or braking power, this will definitely cause a vibrating or shaking feeling. This may also be caused...
Question
ENGINE OVER HEATING
It sounds like you may have a defective thermostat if you haven't checked it yet. If it still overheats after fixing the thermostat then check the radiator next. Make sure the radiator flows in all of the fluid properly. Lastly,...
Question
I belive its my alternator put 3brand new batteries in the car and still want start
Hey thanks for writing in about your 1990 Lexus LS400. A no crank condition such as this will not be the alternator. You either have a bad starter or a bad connection. The most effective tool to diagnose this condition...
Question
Need to no how to bypass lamp failure sensor for tail & brake lights to work
Hello. Bypassing the lamp failure sensor involves locating the correct signal and ground wires and splicing them together to bypass the circuit. The actual cutting and splicing process is rather simple, however, you must make sure that the correct wires...
Question
What would be a price estimate of replacing a timing belt but not the the component kit?
The timing belt on your vehicle is recommended to be changed every 60,000-90,000 miles. If a timing belt fails, the engine will stop running, and you may damage the engine. To get an idea of the cost involved to replace...
Question
Car keeps dying
There are usually two different issues that cause the engine to stall or reduce RPM in situations like this. The first thing I'd look at is the idle control valve or sensors that monitor the fuel system. The second item...
Question
Noise in power steering and wheel difficult to handle
The power steering is not giving enough pressure from a leak or a defective pump or rack and pinion, depending on if whether it is leaking. If the pump works better when warm, then you may need to have the...
Question
My car won't start no crank the lights and everything r good battery good changed the starter relay and a couple other fuses.
Hi there. It sounds like the starter may have failed. Many times when a starter fails, it gives no warning or signs leading up to the failure. Make sure the battery and alternator is healthy with proper testing, not a...
Question
Overheating, blow cold air
The heater not working in some cases may be related to the overheating problem you are also having. This may be due to a faulty heater blower motor or potentially a bad heater core. As you may know, the heater...
Question
Bank 1 too lean, cylinder 1 misfire.
Hi there. There are several possible sources that trigger these two codes including a faulty fuel pressure regulator, weak fuel pump, clogged fuel filter, faulty powertrain control module, vacuum leak, faulty injector(s), faulty oxygen sensor(s) and a faulty mass air...
Question
My check engine light came on and my car was diagnosed as needing a catalytic converter. Now, my car won't start.
Hello, thank you for writing in. The catalytic converter can cause a vehicle not to start. This would be an extreme situation where part of the catalyst inside has broken off and is clogging the entire exhaust pipe. Tap on...
Question
Replaced the radiator but now my can is running hot. Never had this problem until the radiator was replaced
There area number of things that can make your car run hot such as low coolant levels, a faulty thermostat, or a failing coolant fan switch. As you may know, the coolant fan switch helps to maintain the proper coolant...
Question
How to take air out of cooling system Lexus ls400 1997?
Hi there. First check the cooling system for the right amount of coolant and top it off if its low. Then run the cooling system until the engine is hot at operating temperature. Shut off the engine and let it...
Question
Electrical problems
Hello. The voltage regulator is the component that adjusts and maintains the electrical system's output, making sure that there is enough power generated to meet the system's requirements. When it fails or has an issue it can cause symptoms similar...
Question
I have removed the alternator, and did not remove the fan clutch or radiator. The belt tensioner on my 1997 Lexus LS400 does not
Hi there. The belt tensioner that you want to replace requires removal of the alternator and timing covers. These components overlap onto the tensioner. Caution is needed as I'm sure this vehicle has brittle plastic pieces and wiring harnesses. If...
Question
How do I know if the Battery needs replaced?
After the battery was discharged and the battery was jump started the engine stalling is normal until the computer relearns the idle again. If after recharging the battery to 100% the battery should be retested to make sure it passes...
Question
After driving my car, the next day will not start. It turns over but will not start 1993 Lexus LS400
Hello - the first task is to get any problem codes, whether the Check Engine is illuminated or not. The next step is to determine whether you have spark at the plugs, or the fuel pump runs on those days...
Question
I am thinking of buying a 98 Lexus LS400 with 200,000 mi for $3000. IT runs great and is in beautiful condition. Check Engine light is on 1998 Lexus LS400
Hello - as to the starter question, if the starter starts to spin immediately after you turn the key to the "Start" position, spins the motor over briskly without strange noises, hot or cold - the starter is probably fine....
Question
How do I fix this
Hi there. It does sound like the vehicle is running excessively rich, but the question is why is it running so rich that fuel is accumulating in the oil? Fuel in the oil means that the cylinder walls are being...

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