Car stalls when warmed up and hot and humid

Tiny
RKILBOURNE
  • MEMBER
  • 1999 MAZDA 626
  • 100,000 MILES
27 mi trip to work. Runs great in morning. In afternoon when hot and humid, and engine is hot engine hesitates and cuts out very much like a vapor lock.
Saturday, September 3rd, 2011 AT 12:20 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
https://www.2carpros.com/articles/engine-hesitates

Could be caused by one of the following below

Oxygen sensor.
Catalytic converter.
Fuel injectors dirty/sticking.
Mass airflow sensor/Airflow meter.
Throttle position sensor.
Crankshaft position sensor
Knock sensor
Manifold absolute pressure sensor.
EGR Valve
Fuel pressure regulator leaking or defective fuel pump.
Fuel contamination.
Foul/defective spark plugs.
Open spark plug wires.
Ignition coil/Coil packs defective.
Incorrect ignition timing.
Cap and rotor.

Note:If it doesn't apply disregard it and keep testing.
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Saturday, September 3rd, 2011 AT 12:52 PM

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