Top 20 2004 Lexus GS 300 Questions & Answers

I do think you have a leaking engine cylinder gasket or a cracked cylinder head.

If the security light is flashing, then the alarm has disabled the engine. Try locking with key remote and unlocking again with key(not remote) and see if that works. OR put key in turn to ACC and leave for about 5-6mins, switch off and back on to start engine, think thatshould do it. Let me know if it worked, which one.

If the immobilizer is worth anything, it will not work at all.

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fit a new battery and get a scanner tool to reset the ECM/immobilizer mobile mechanics should have a scanner for the job

The purge valve is mounted in the engine compartment, probably on the firewall. It is held on by two bolts. It has an electrical connector and two vacuum hoses and looks like the pic below. . Release the connector and unscrew the two bolts. Move the vacuum lines from the old valve to the new one. Bolt the new valve down and connect the wiring harness.

remove under panel or remove grill if possible

please make an obd check system

IS THE BATTERY INDICATOR GOES IN YOUR DASHBOARD,IF THERE IS,YOUR ALTERNATOR IS NOT CHARGING THE BATTERY THATS WHY YOUR CAR IS SHOUTOFF.CHECK YOUR ALTERNATOR FIRST,

Trust what the AA says .. It does sound like you have an airlock .. and the airlock is likely to be in the heater matrix, as opposed to the radiator. Bleed the heating system: Set your heater controls to hot and fully open. Let the engine work until it reaches normal operating temperature. Check your coolant level to see if it has dropped. You can always bleed the coolant system by leaving the coolant bottle cap off for 10 minutes whilst the engine ticks over. It isn't your water pump.

On this website, you find fuse box diagram and description for Lexus GS300 http://www.autogenius.info/?s=gs300

What type of vehicle?

wow my hats off too you , im not knowing anyone that actually opens up one of these to replace the rectifier , any hows , if you use a volt meter that has a pretty good screen , you will see if charging system is working , placing red probe of meter on + battery term and black probe on - of battery , with car off you should have right about 12 volts after you start car and idle it you should have 12.5 to 13 volts , and this will increase to as much as 14.8 volts as you rev it up a bit if your meter doesn't show these then you still have problems in your charging system

Starters shot

i would not recommend bypassing the relay

What year lexus? Im happy to tell you exactly where it is and how to remove it etc but i need to know the year. Please Advise. -Tim

the starter contacts inside the starter are probably worn out.This is a very common fault on toyota starters.usually a couple clicks and it starts,then it gets worse,7 or 8 then it dies and just clicks. the click is the solenoid moving back and forth. if you remove the starter,you will see three small bolts on top of the solenoid assembly.open it up and remove the cover.Inside you will see two copper contacts,one on each side one is much bigger than the other.When the solenoid pulls in it connects the two.Remove the sets of nuts that the starter wires go to and the insulators and washers to change the contacts which can be bought from the dealer for 15 dollars or so. make sure to put the washers ,nuts etc back in exact order of removal.best of luck.i have repaired over 50 starters.the actual starter portion is not the issue.

Look in fuse box for blown fuse

Its in, what you call limp mode . You need to take it to a garage.they will plug it in. There will be some fault with the car. It goes into limp mode. So no more damage . Can happen.

check the mass air flow meter.