Need help 2000 RX300 timing belt ?
I don’t have paper clip thingys but zip ties should work so the belt doesn’t jump. I zipped tied them into place last time.
There should be tons of slack once the tensioner is off.
Try putting back your old belt and see if it runs fine.
You can leave all the covers off but install the dampener and washer.
Dont worry, the belt wont walk off.
And no worries man, we'll get it.
Just pull the pin.
Then rotate the crank clockwise till no slack on the right can to wp.
Then fire her up.
Last edited by Gearhead75; Jan 3, 2020 at 12:02 AM.
That rules out that issue now.
So if im understanding this correctly, cold start high idle — it idles fine.
But when it gets closer to operating temps, idle just falls flat on its face and eventually dies out.
Now you suspect the battery.
Might as well have that tested too just for peace of mind.
I actually ran into that into that similar problem.
Would barely idle so i hooked up a jumper pack on the battery and drove it home fine.
Replaced the battery afterwards.
Thats why I can’t imagine it being the battery? I mean I had it on the charger all night for 12+ hrs, and it started great and idle great but died out after trying to put it into gear, and with each start after the first the idling gets a lil shorter before dying out again.
Once started, & idling would that in itself rule out battery?
Last edited by Gearhead75; Jan 3, 2020 at 10:54 AM.
Thats why I can’t imagine it being the battery? I mean I had it on the charger all night for 12+ hrs, and it started great and idle great but died out after trying to put it into gear, and with each start after the first the idling gets a lil shorter before dying out again.
Once started, & idling would that in itself rule out battery?
Its possible its failing to the point cleaning it does free it up.
IAC is what controls idle.
Thats the only thing i can think of that would make it sputter out during idle.
I noticed that the cruise control wire for the TB is a lot tighter than the accelerator wire is, should I try tightening that a bit?
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So this is the IAC valve with the sensor removed. I noticed that I can turn it left and right about 90 degrees, but it doesn’t have any retention or spring to return itself back. So when I turn it completely 90 degrees left it stays there, I turn it by hand completely right- it stays their. Shouldn’t this part/magnet have retention to return itself?
So this is the IAC valve with the sensor removed. I noticed that I can turn it left and right about 90 degrees, but it doesn’t have any retention or spring to return itself back. So when I turn it completely 90 degrees left it stays there, I turn it by hand completely right- it stays their. Shouldn’t this part/magnet have retention to return itself?
No tension springs here.
Turning left will open the valve.
Turning right will close it.
The center pin is voltage power.
#3 wire is Ground (white wire/black tracer)
#2 is where the ECU controls it.
I suggest to leave the IAC motor off the valve.
Turn the valve left all the way (open)
Run the vehicle and see if it still sputters out.
You might have high idle since its open all the way.
If you can manually turn the valve to a desired rpm at idle, leave it there.
However here err are my new marks.
im getting so frustrated. Those marks are freaking perfect- dead on!
im thinking about renting a fuel pressure gauge and check the fuel pressure. I have no idea what the hell is wrong. No CEl- nothing else to off of.
However now it sound as if im missing a ground wire or something. Is there any that I should check?
i feel you man...
That would just be crazy coincidence of you are loosing fuel pressure after a tbelt job.
Only grounds i remember are the 2 clip on ones by the mount.
Im at a lost!
The only other thing thing I can think of is check the fuel pressure and also perhaps do new plugs and coils?
But right now I can’t even get the car to stay started, it just turns over and dies out right away! It won’t even idle anymore.
How about the throttle accelerator cable? Should I try tightening that?
almost like the motor is hydro locked.
I donno
new symptoms are:
1) the car will start, turn over and catch but at a real low RPM of 400 or so before just dying out in the matter of 3 seconds. It won’t even reach idling before dying. Starter sounds strong.
2) battery has been tested and is good.
I cleaned the TB & IAC valve
Also let me ask you this, since I had to re do the belt bc of that one tooth being off, do you think that perhaps a crankshaft or camshaft positioning sensor could have went? As if they were trying to read correct positioning and couldn’t?
Last edited by Gearhead75; Jan 4, 2020 at 12:34 AM.
new symptoms are:
1) the car will start, turn over and catch but at a real low RPM of 400 or so before just dying out in the matter of 3 seconds. It won’t even reach idling before dying. Starter sounds strong.
2) battery has been tested and is good.
I cleaned the TB & IAC valve
Also let me ask you this, since I had to re do the belt bc of that one tooth being off, do you think that perhaps a crankshaft or camshaft positioning sensor could have went? As if they were trying to read correct positioning and couldn’t?
Have you pulled a plug out?
All that cranking couldve flooded the engine preventing the spark plugs to fire.
Hoping its as simple as this.
Cam/Crank sensors being bad would trip some kind of code.
These sensors are pretty robust.
FWIW, when i had my fuel pump fail, i didnt exhibit a check engine light.
Can you post a video when trying to start the vehicle?


