Auto Answers » Engine » Lexus

Lexus engine repair questions and answers

Post your Lexus engine question or share what you know by answering questions

612 Questions
Sort by:
  • AutoMD Member
    AutoMD Member - 2000 Lexus SC300 - Engine - 7/23/2014
    Engine is quickly overheating
    Hi my car has about 150k miles and has been running smoothly. Yesterday I drove 3 miles to a fast food shop, ate in my car for about 5 minutes and noticed coming home that the heat gauge was entirely up. I was less than a half mile away so I got home. This ...
     
    • Jimm
      7/23/2014 Jimm
      The most common cause of overheating is because of an external leak from a water pump or a radiator or heater hose. The way to find the leak is to wait till it is overnight cold and maybe just pour water in and see if the leak is large enough to see it simply leak out from where it has a leak. if you pour in a half gallon or more and you still see no leak its time to pressure check the system.

      Here is a short list of possible causes for overheating;

      Low coolant level
      Leaking coolant
      Improper coolant concentration (not at recommended 50 / 50 mix of anti-freeze and water)
      Clogged radiator hoses
      Clogged heater hoses
      Clogged radiator passages
      Clogged heater core
      Faulty thermostat
      Faulty water pump
      Faulty radiator cooling fans
      Faulty radiator cooling fan switch (coolant temperature sensor)
      Faulty / worn serpentine drive belt
      Faulty / worn drive belt tensioner


  • AutoMD Member
    AutoMD Member - 1995 Lexus LS400 - Engine - 7/5/2014
    When both catalytic converters turn red hot what do that meain
    20000 miles it run rough cold are hot
     
    0 answer
  • AutoMD Member
    AutoMD Member - 2001 Lexus GS300 - Engine - 7/4/2014
    Several times after stopping to get gas, my car wont start. if i wait long enough it will start.
    it's usually very hot outside. vehicle has 230k mileage.
     
    • CVO
      7/4/2014 CVO
      1. Check the fuel injection pump relay. Under extremely hot temperature, the FI pump relay is still remain engaged and created a confusion to the powertrain control module.

      2. The battery cables are aging over the time and stopped the current flow from the battery to the starter due an increasing of their resistance through the expanding or dilating under hot temperatures. Replace the battery cables as necessary.

      Note: i have seen the FI pump relay was defective in the early Lexus models.
  • AutoMD Member
    AutoMD Member - 1999 Lexus SC300 - Engine - 6/16/2014
    When I start my car, there is a slight murmur/vibration. You can feel it in the steering wheel. It's there whether it's
    I don't know if this is part of the problem or not: A few months ago I filled the tank (91 octane) and brought it home. While in the garage, I put in a container of Chevron Injector Cleaner. The car sat there over night, and when I started it the next morning, the ...
     
    • GT500Knights
      6/16/2014 GT500Knights
      Can't really tell what the problem might be....hard to tell based on description.

      As far as the gasoline you put in your car, it does not help. First off, any type of injector cleaner is supposed to be put into a tank of near-empty gasoline. By the way you said it, it sounds like you put the gasoline in and then the injector cleaner. The problem with doing this backwards is that the injector cleaner is no longer thoroughly diluted throughout the gasoline, instead it is going through the fuel pump as spurts here and there.

      Second off, 91 octane does NOTHING, I mean ABSOLUTELY NOTHING compared to 87 octane gasoline as far as fuel quality or detergents. Higher octane level simply means the gasoline has more resistance to detonation. Higher performance cars such as bmws, porches, and corvettes will specifically require higher octane fuel due to higher compression ratios and/or supercharger/turbocharger requirements. The air fuel mixture inside the combustion chamber can self-detonate before spark plug ignition if lower octane than required is used inside an engine. Contrary to popular believe, 89 and 91 octane fuel will do nothing as far as performance, fuel economy, and injector cleaning go. The only time to use higher octane rating like 89 or 91 grade is if your vehicle manual states that it is needed.
  • AutoMD Member
    AutoMD Member - 1999 Lexus SC300 - Engine - 6/15/2014
    When I start my car, there is a slight murmur/vibration. You can feel it in the steering wheel. It's there whether it's
    I don't know if this is part of the problem or not: A few months ago I filled the tank (91 octane) and brought it home. While in the garage, I put in a container of Chevron Injector Cleaner. The car sat there over night, and when I started it the next morning, the ...
     
    0 answer
  • AutoMD Member
    AutoMD Member - 2000 Lexus GS300 - Engine - 5/21/2014
    Dash board goes out for a second, then comes on again.
    Couple of times now, my entire dash board and radio have gone completely off for just a second and then immediately come back on. When it comes back on all the "idiot" lights briefly light up, then turn off. This has happened for a few days, first thing in the ...
     
    • Jimm
      5/21/2014 Jimm
      Check these possibilities; ground / wire connection at the instrument panel, ground / negative connection at the battery (loose or corroded).
  • AutoMD Member
    AutoMD Member - 2007 Lexus IS250 - Engine - 4/23/2014
    Unpleasant sound when starting the engine
    Unpleasant sound when starting the engine.
     
    0 answer
  • AutoMD Member
    AutoMD Member - 2007 Lexus IS250 - Engine - 4/23/2014
    Unpleasant sound when starting the engine
    Unpleasant sound when starting the engine.
     
    0 answer
  • AutoMD Member
    AutoMD Member - 2003 Lexus ES300 - Engine - 4/21/2014
    O2 sensor on 2003 lexus es 300
    does any one know if bank 1 is the front or rear of the engine i have a o2 sensor bad that is bank 1 sensor 1
     
    0 answer
  • AutoMD Member
    AutoMD Member - 1998 Lexus LS400 - Engine - 4/13/2014
    Why does my car shake at stops?
    does not shake in park
     
    • HouseCallAuto
      4/13/2014 HouseCallAuto
      Plug in a code reader and get fault codes and post the code numbers.
  • Drift Monkie
    Drift Monkie - 1992 Lexus SC300 - Engine - 3/22/2014
    Excess pressure in fuel tank?
    220k miles. No CEL and could not connect with scanner. Prior to installing new parts, vehicle only cranked. New parts were fuel pump, fuel filter, line from fuel tank to filter, and fuel pump control unit. Vehicle cranked for long periods before turning on (4 tries ...
     
    • HouseCallAuto
      3/22/2014 HouseCallAuto
      Impossible to say whats goin on for multiple reasons. Pre OBDII so cannot get code info that will assist in a diagnosis. However, from what you stated there may be a clogged charcoal canister. There are two check valves in the system canister hoses. One check valve is in the hose leading to the canister and the other comes from the intake manifold. Check that air flows freely from blue port to black port of check valve but that no air flows from black to blue (the check valve from the manifold is color coded). I'm not sure if the check valves atre no good or installed backwards but the one from the manifold presumably flows vacuum to pull vapors from the canister. maybe their is a hose crossed someplace? You really need to spend any amount of money to buy a hose diagram that shows all the vacuum hose and charcoal canister hoses and info about the EVAP system. Ya better do it cause the shop you will take your car to when you give up tryin to figure it out is gonna slam you plenty. Go to a library reference section and look at a factory repair manual for '92 SC300
  • Bill
    Bill - 1999 Lexus ES300 - Engine - 3/8/2014
    Having problems keeping it running!!
    I have to get my foot on the gas after I have started it. when Im at a stop light I got to keep one foot on the gas and one on the brake or it will die out. what could be causing this? there is no check engine light or nothing on neither. it happens off and on. Im ...
     
    • HouseCallAuto
      3/8/2014 HouseCallAuto
      If it is otherwise running smooth and not misfiring and just will not stay running at an idle then your cause is a bad idle speed control on the throttle body. Replace it.
  • AutoMD Member
    AutoMD Member - 1993 Lexus SC300 - Engine - 3/5/2014
    Car didnt pass smog, was told that my EGR and catalytic converter were good. Thinks its my o2 senser they are origional.
    What else could it possibly be because it passed with flying colors last year?
     
  • AutoMD Member
    AutoMD Member - 1993 Lexus LS400 - Engine - 2/1/2014
    My car won't fire after replacing the battery
    after jump-starting my car, it stopped running. I replaced the battery, but it now won't fire. What are the possible reasons?
     
    • HouseCallAuto
      2/1/2014 HouseCallAuto
      Have to give me something to work with. Is there ignition spark? Possible bad crankshaft sensor, but the crank sensor would not fail just from from a jump start. When you turn the key to the "on" position do you see the check engine light illuminate? A car that will not start immediately after a jump typically means that either the person that was jumping the car reversed polarity and burnt the ECM in the car or if you are sure that polarity was not reversed, the ECM can still fail just from the surge of hooking up the jumpers. I am not saying replace the ECM but it is strongly suspect and some circuit tests have to be done to confirm it.
  • AutoMD Member
    AutoMD Member - 1999 Lexus GS300 - Engine - 2/1/2014
    The car shakes as if it is going to turn off and it has turned off while i was driving
    the check engine light is on, the battery light turns on when i turn on the seat wamer, cant turn on radio cause the car will start shaking then turns off. I have replace the sensor and put in new time belt.
     
    • Jimm
      2/1/2014 Jimm
      The check engine light is located on the dash and stays on if the computerized engine control system detects an engine performance or emissions problem.

      First step - have the stored fault codes or check engine light scanned - for free - at any local auto parts store; Advance Auto, Auto Zone, NAPA. Then, post a reply as 'add answer' with the specific code for more assistance. There may be a fault code stored in the OBD memory which may not be displayed as a check engine light
 
AutoMD Verified Customer
AutoMD obtained proof this customer interacted with the shop.