Lexus engine repair questions and answers
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bidsboot1 - 1994 Lexus ES300 - Engine - 6 hours agoThis began, when the vehicle was diagnosis with a bad transmission. After the used transmission was installed, the O.D. lights would not go out. So, the mechanic put a used computer. It did not stop the problem. Later found out that the solenoids were sticking in ...
boydonthemountain - 1993 Lexus ES300 - Engine - 5/24/2013before that running funny hesitation, shake motor, bogging when first starting off
5/24/2013 JimmFor the overheating issue; loss of coolant because of a coolant leak is probably the most common cause of engine overheating. Possible leak points include hoses, the radiator, heater core, water pump, thermostat housing, head gasket, freeze plugs, automatic transmission oil cooler, cylinder head(s) and block.
Make a careful visual inspection of the entire cooling system, and then PRESSURE TEST the cooling system and radiator cap. A pressure test will reveal internal leaks such as seepage past the head gasket as well as cracks in the head or block. A good system should hold 12 to 15 psi for 15 minutes or more with no loss in pressure. If it leaks pressure, there is an internal coolant leak (most likely a bad head gasket but possibly also a cracked cylinder or engine block).
It is important to pressure test the radiator cap, too, because a weak cap (or one with too low a pressure rating.
If no leaks - either internal or external, then there are a few possibilities for the overheating. Clogged or dirty radiator passages, clogged radiator hoses, clogged heater hoses, clogged heater core, radiator cooling fans not working.
For the hesitation / bogging / loss of power; first step - have the check engine light or stored fault codes scanned - for free - at any local auto parts store; Advance Auto, Auto Zone, NAPA. Then, post a reply as 'add answer' for more assistance.
Possible Causes of Engine Hesitation or Stumble:
Dirty fuel injectors (cleaning the injectors often fixes this)
Dirty air filter (change filter)
Dirty / clogged fuel filter (change filter)
Bad MAP (manifold absolute pressure) sensor
Bad TPS (throttle position) sensor
Bad or dirty MAF (mass airflow) sensor
Low fuel pressure (leaky fuel pressure regulator or weak fuel pump)
Vacuum leaks (intake manifold, vacuum hoses, throttle body, EGR valve)
Bad gasoline (fuel contaminated with water or too much alcohol)
Sometimes, what feels like a hesitation is actually ignition misfire rather than lean misfire. The causes of ignition misfire may include:
Dirty or worn spark plugs
Bad plug wires
Weak ignition coil
Wet plug wires
kengrisham - 2003 Lexus IS300 - Engine - 5/23/2013
brian - 2006 Lexus RX330 - Engine - 5/20/2013Cooling fan stays on when engine is shut off
sam - 1999 Lexus ES300 - Engine - 5/18/2013
5/18/2013 JimmAre you referring to the vacuum control valve (VCV) - also known as a switching valve? If yes, then there are several vacuum control or switching valves on the vehicle; one is located back near the muffler, just under the frame between the 2 rear tires. It should come as part of the charcoal cannister assembly.
Another valve (the purge VCV) is located near the intake plenum.
sam - 1999 Lexus ES300 - Engine - 5/11/2013
5/11/2013 JimmP0446 = Evaporative Emission Control System Vent Control Circuit Malfunction
A code P0446 could mean one or more of the following has happened:
Faulty vent valve
Open, short or excessive resistance on Vent valve control circuit
Blockage of vent valve
With a P0446 OBD-II trouble code, here are some things to try:
Replace Vent valve
Repair open, short, or resistance problem in control circuit
Repair open, or short, or resistance problem in power circuit
ply48 - 2000 Lexus RX300 - Engine - 5/7/2013
1/18/2013 jeffrslocumBank 1 is in the exhaust that comes from the side of the engine containing cylinder number 1, Bank 2 is the exhaust that comes from the side of the engine containing the even numbered cylinders. Sensor 1 is before the catalytic converter, sensor 2 is after the catalytic converter
5/7/2013 Walker ProHello,
Your Vehicle is equipped with two Air Fuel Ratio Sensors upstream of the catalytic converter in each exhaust manifold on the engine.
It is also equipped with a switching sensor downstream of the catalytic converter.
The Bank one sensor will be located on the engine bank with the Number one cylinder or the Bank that is farthest forward on the engine.
As a word of caution here, it is wise to replace all of the sensors when this happens or it is likely you will have another check engine light soon after replacing the first sensor.
The upstream sensors are Walker Part Number 250-54054 & the downstream sensor is Walker Part Number 250-24277.
If you have any further questions or concerns please contact us and we will be happy to help.
Walker Pro (www.walkerproducts.com)
psxrays - 1991 Lexus LS400 - Engine - 4/28/2013dose it in nurtural.when in drive you cant hear it surging but the rpms are way to high. when it is cold or warm it dose the same thing..and it dose it when I am stoped it dose it all the time..all we done to the car was replace the harmonic balancer and the belt ...
barneyboy007 - 1993 Lexus LS400 - Engine - 4/22/2013before it even gets to select the gear the engine will stop. you can hold your foot on the accelerator to bring up the revs but that makes no difference. its as though it has an elec issue when its told to select a gear
redsoxx9 - 2005 Lexus ES330 - Engine - 4/18/2013
ahmed-al-gattan - 2008 Lexus LX570 - Engine - 4/14/2013"Check VSC System", "engine sign", "blinking 4Lo", and "triangular danger" are all lighting on the dash board. Yesterday when was on my from work to home I suddenly looked at the dashboard and all those indicationes above are lighted I was so scared.I went through ...
ahmed-al-gattan - 2008 Lexus LX570 - Engine - 4/14/2013Yesterday when I was on my way from work to home suddenly looked at the dashboard and all those indicationes above are lighted I was shocked. I went through the manual but no help for such strange problem. I really want to know what could be a reason/solution for ...
pat - 2000 Lexus RX300 - Engine - 3/31/2013I had sensor changed at a local shop and The same code is coming up, check engine light on again.
timwburton - 2004 Lexus RX330 - Engine - 3/16/2013Just as all the dash indicator lights come on when the ignition is in the "accessory" position with the engine off, they pop on periodically while the engine is running. I can turn the engine off and restart, and they'll go back off, but this keeps occurring. ...
famousgipson - 1994 Lexus SC400 - Engine - 3/8/2013