Starts but dies after a second

Tiny
LWBJR1969
  • MEMBER
  • 2000 TOYOTA 4RUNNER
  • 3.4L
  • V6
  • 2WD
  • AUTOMATIC
  • 170,000 MILES
Ran great, but was giving codes indicating MAF needs to be cleaned/replaced. I removed and cleaned the MAF with CRC MAF spray. Did not make contact with any of the wires in the MAF. Also cleaned throttle body with CRC TB spray and replaced coolant temperature sensor, given additional codes indicating defective ect sensor. Put all back together and now it won't run. Engine cranks fine and starts, but only runs for a second before shutting off. Allowed to sit over night thinking possible overuse of TB cleaner that needed to evaporate. No luck. When I attempt to start it with gas pedal to the floor in hopes of clearing any flooding, it backfires into the air intake. Help!
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Sunday, January 31st, 2016 AT 3:02 PM

4 Replies

Tiny
CARADIODOC
  • EXPERT
Your first mistake was in reading the diagnostic fault codes. They never say to replace parts or that one is defective. That is especially true with a coolant temperature sensor. They have only one simple resistor inside so their failure rate is extremely low. Fault codes also never say cleaning something will solve that code. Fault codes only indicate the circuit or system that needs further diagnosis, or the unacceptable operating condition. They never say why those conditions exist.

For a sensor fault code, always start by inspecting the wiring harness and connector terminals. Voltage readings will tell if the circuit is working properly. Sometimes you need a scanner to read live data to see what the Engine Computer is seeing.

An engine that runs for one second has a working ignition system and most likely no problem with the fuel supply system. The most common cause of immediate stalling is it's in theft mode.
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Sunday, January 31st, 2016 AT 3:22 PM
Tiny
LWBJR1969
  • MEMBER
Suggestions on getting it out theft mode?
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Sunday, January 31st, 2016 AT 5:50 PM
Tiny
HMAC300
  • EXPERT
Look online for your vehicle if you don't have a manual to reset security /antitheft
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Monday, February 1st, 2016 AT 7:02 AM
Tiny
CARADIODOC
  • EXPERT
Yup. The only cars I'm most familiar with are Chrysler products. On those you unlock a front door with the key or remote unit. If it doesn't work with the key, suspect a broken wire between the door hinges or a disconnected or defective switch in the door.

If you can't find anything online, the dealer should be able to help.
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Monday, February 1st, 2016 AT 3:01 PM

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