It always stall when same conditions exist (engine hot, slowing down or idling at stop sign. (This can't be called intermittent problem)so why no code is recorded for this problem?
The very first time it occurred, I found the inlet hose connected to the throttle body was cracked. Replaced it and it worked fine for 2 weeks and then it kept on stalling.
Engine light works, reports other faults (disconnected O sensor, it was detected, error code was recorded and I was able to read the code from engine light)
Verified and adjusted idle speed (Cold start 1700, gradually rpm drops to 800 in park and 600 in Drive). Timing is set to 10.
PCV is has been a major suspect but the location makes it unreachable unless half parts under the hood are removed but I did heat up the engine and sprayed Throttle cleaner in the valve a few times with no results.
So far done the following:
Used Fuel Injector cleaner and it run fine for 60 miles before it stalled. Inspected all related hoses, cleaned air inlet path, Verified functionality for canister, Dash Pot, Pressure Regulator, EGR Modulator, VSVs and Check Valve per Toyota Shop repair manual instruction. Removed, cleaned and reinstalled Throttle body, Mass Airflow sensor, and EGR valve. Replaced Spark Plugs, Oxygen sensor and Catalytic Converter. Won't make it to the dealer (too far) so I took it to local auto repair shop. They replaced vacuum switch and also killed my battery in the process (total $350) and still problem exists. I have owned this truck for over 20 years and depend on it. Please help!
So far I have spent $787. If my problem is resolved I will most definitely donate to this site.
Wednesday, February 22nd, 2012 AT 8:35 PM