Engine shuts off while running
SOURCE: my 2006 toyota fortuner suddenly
The best thing to do is hook your vehicle up to an on board diagnostics (OBD II) electronic scan tool. This electronic tool attaches underneath the drivers side steering wheel and it will obtain the trouble codes stored inside your vehicles computer. You can borrow (for free) an OBD II scan tool at your local auto parts store. Write down the trouble codes and then look in the back of a Haynes repair manual. Match the codes up to the codes found in the repair book and this will pinpoint the exact component that has failed. This will save you time and money. Based on what you have described I would check the fuel pump fuse and the fuel pump with a multimeter for continuity.
This problem is commonly caused by a dirty automatic idle speed control valve and throttle valve but always run a OBD2 fault code as well as the cleaning procedure. Buy a can of throttle valve cleaner (do not use carburetor spray cleaner!) from NAPA or Carquest (made by CRC chemicals) and spray it into the air intake while the engine is running, use up about 1/2 the can, engine will try to stall hold the speed up, shut it down and let it soak for 30 minutes, restart and blow out the remaining fluid, shut it down and disconnect the negative battery cable for 5 Min's to reset the base idle control. If the above cleaning doesn't cure your issues you need to have the computer controlled automatic idle speed control system diagnosed and repaired by a dealer or electronic engine control repair shop.
Engine stalling and rough run
issue at low speeds
This problem is commonly caused by a dirty automatic idle speed control valve and throttle valve. Buy a can of throttle valve cleaner (do not use carburetor spray cleaner!) from NAPA or Carquest (made by CRC chemicals) and spray it into the air intake while the engine is running, use up about 1/2 the can, engine will try to stall hold the speed up, shut it down and let it soak for 30 minutes, restart and blow out the remaining fluid, shut it down and disconnect the negative battery cable for 5 Min's to reset the base idle control
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