AT3618

Hi, I have a 2003 ES300, anybody know could help me find out what the problem could be? The car starts fine, 1200 RPM when engine cold, after about 5 min, engine warm up to the normal temperature, RPM drop to about 600. Then the engine just stopped. All accessories are off (AC, headlights, radio off). Battery voltage before the engine stop is at 14.2v. Check engine light did not come on. No error code found by the code reader.

dwoods801

and it will not restart now? Or it dies every time you are letting it warm up? I don't understand how things stand now?

chuyrobles

You need to read live data via a code reader. Look at fuel trims and O2 sensors’ readings.

You can go through some routine cleaning - throttle body and MAF sensor are sensitive to grime build-up and are relatively easy to clean. Look at your air filter and check the air ducting that there are no rodents or debris in there.

You can also be having a dying fuel pump. A shop will need to check the fuel pressure.

AT3618

If I want to restart it immediately, it will not restart. If I let it cool down and then restart it, then it will start up and then about 5 minutes idle, it just suddenly stopped again.
I just cleaned the throttle body and also put in a new Mass Air Flow sensor, but the problem is the same.
Also checked all vacuum hoses al there is all plugged in securely.
Very strange. Appreciate any help to pinpoint the problem.

AT3618

Thanks for the advice. Just cleaned throttle body and new MAF sensor. The air filter is new too. Will get a code reader to see those readings.

chuyrobles

A bad coolant temperature sensor could be telling your engine it is hotter than it is and trigger a shut-down. Here is a link how to test it.
https://axleaddict.com/auto-repair/C...re-Sensor-Test