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SC400

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Question
Car idles high at startup
The idle air control valve on your car may be defective, causing the high idle. A couple of checks would need to be done to determine if this is the case. Your engine needs to be checked for any vacuum...
Question
Engine not running properly after starter change.
This sounds to me like something was done incorrectly during the repair. Engines now have many sensors that all feed back information to the many computers of the vehicle. If any sensors were left unplugged, that is likely your issue....
Question
Alarm goes off suddenly
Hello. It sounds like your Lexus SC400's immobilizer in the alarm system is working intermittently and in need of repair. It is possible for you to disable the alarm system, but this is not a simple job and therefore not...
Question
Rubbing sound upon turning to the left
Hello. The tires may be rubbing against the fender well or a suspension part. There could also be a problem with the axle or the sway bar link on the left side, where the noise is coming from. I would...
Question
Noise at higher speeds, engine revs in park
Hello. The first step would be to have the new tires that you installed inspected for defects and to make sure that they were properly balanced. I would also have the wheel bearings checked as they could be causing the...
Question
The car shuts off after an hour in the sunlight
Hello. There may be a problem with the mass airflow sensor on your 2000 Lexus SC400. If the sensor overheats and sends a false reading to the car’s computer, this may result in the engine shutting off. The coolant temperature...
Question
Car misfires when the weather is cold and while idling
Hello. Thanks for writing in about your 2000 Lexus SC400. It may be necessary to replace all of the ignition coils in addition to having the ignition coil wiring inspected for damage in order to determine why your engine is...
Question
Poor idle car keeps shutting off
Sound like your fuel pump stopped or something else is causing the no start like timing belt? Have the vehicle checked and diagnosed by a mechanic like one from YourMechanic.com to find the reason of the no start.
Question
Advice on buying a '93 Lexus SE with a 2JZ engine with a blown head gasket
If they did blow the head gasket, there is no saying what they did to the engine. You can of course, take it apart. It's a nice engine. It's a straight six -- not a V6. So you only have...
Question
Can a bad alternator drain a battery
Hi there. Generally, a bad alternator will not drain a battery, but will not maintain the battery charge. It sounds like you have a parasitic draw on the electrical system; something is continuing to power on after the vehicle is...
Question
Hi, i was driving my car just fine today when all of a sudden it started jerking. it jerked a lot getting up to about 20mph then i
Hi there. I wouldn't suspect that removing the battery has caused any problems. When your engine runs rough, it can be caused by multiple issues, ranging from a vacuum leak to fuel system component problems, and ignition system issues. I...
Question
Need help identifying issue please!
Hello, thank you for writing in. It is possible the leak was starting to form when you were driving around the last couple of days. Automatic transmissions have a complex amount of components, seals, gaskets, and various passages for the...
Question
Need help identifying issue please!
It sounds like the jerking reaction was a result of your transmission being low on fluid. In addition to this, you definitely have a transmission fluid leak that should be looked at very soon. What you are describing is often...
Question
Check engine problems
Hi there. When the signal to and from the camshaft position sensor and the PCM is broken, the ignition spark and fuel injector timing will fail and the PCM will store the P0340 trouble code. This will trigger the illumination...
Question
My car died on the freeway 6 days after getting new battery and alternator. Any idea what this could be?!
The repair work and the stalling are not necessarily related and thus could just be a coincidence. If the car re-started, just check to be sure the battery is fully charged and that the charging system output is correct. If...
Question
My Lexus sc 400 only goes in to reverse. Rpms rev up when in neutral or drive gears
What you are describing is often a sign of low transmission fluid or a faulty transmission control solenoid. As you know, automatic transmissions use pressurized hydraulic fluid to change gears. Every time a gear change is required, the car's computer...

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